{"id":4048,"date":"2025-09-02T00:00:00","date_gmt":"2025-09-02T00:00:00","guid":{"rendered":"https:\/\/lp.szlogic.cn\/glossary\/remote-direct-memory-access-rdma-data-transfer-speed-latency\/"},"modified":"2026-06-22T07:52:24","modified_gmt":"2026-06-22T07:52:24","slug":"remote-direct-memory-access-rdma-data-transfer-speed-latency","status":"publish","type":"post","link":"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/remote-direct-memory-access-rdma-data-transfer-speed-latency","title":{"rendered":"RDMA l\u00e0 g\u00ec? H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 Truy c\u1eadp B\u1ed9 nh\u1edb Tr\u1ef1c ti\u1ebfp T\u1eeb xa"},"content":{"rendered":"<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1200\" height=\"712\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f5687c7be3774f809d4f115676635f9c.webp\" alt=\"Remote Direct Memory Access (RDMA)\" class=\"wp-image-4046\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f5687c7be3774f809d4f115676635f9c.webp 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f5687c7be3774f809d4f115676635f9c-300x178.webp 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f5687c7be3774f809d4f115676635f9c-1024x608.webp 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f5687c7be3774f809d4f115676635f9c-768x456.webp 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f5687c7be3774f809d4f115676635f9c-18x12.webp 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Trong th\u1ebf gi\u1edbi \u0111i\u1ec7n to\u00e1n hi\u1ec7u n\u0103ng cao <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-is-hpc-high-performance-computing\/\"><strong>(T\u00ednh to\u00e1n hi\u1ec7u n\u0103ng cao \u2013 HPC)<\/strong><\/a>, trung t\u00e2m d\u1eef li\u1ec7u v\u00e0 tr\u00ed tu\u1ec7 nh\u00e2n t\u1ea1o, t\u1ed1c \u0111\u1ed9 l\u00e0 y\u1ebfu t\u1ed1 quy\u1ebft \u0111\u1ecbnh. M\u1ed7i microsecond \u0111\u1ed9 tr\u1ec5 v\u00e0 m\u1ed7i chu k\u1ef3 CPU \u0111\u1ec1u quan tr\u1ecdng. Tuy nhi\u00ean, c\u00e1c giao th\u1ee9c m\u1ea1ng truy\u1ec1n th\u1ed1ng nh\u01b0 TCP\/IP t\u1ea1o ra m\u1ed9t \u0111i\u1ec3m ngh\u1ebdn \u0111\u00e1ng k\u1ec3, bu\u1ed9c CPU ph\u1ea3i d\u00e0nh th\u1eddi gian qu\u00fd b\u00e1u x\u1eed l\u00fd l\u01b0u l\u01b0\u1ee3ng m\u1ea1ng thay v\u00ec ch\u1ea1y \u1ee9ng d\u1ee5ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u00e2y l\u00e0 l\u00fac m\u1ed9t c\u00f4ng ngh\u1ec7 c\u00e1ch m\u1ea1ng xu\u1ea5t hi\u1ec7n: <strong>Truy c\u1eadp B\u1ed9 nh\u1edb Tr\u1ef1c ti\u1ebfp T\u1eeb xa (RDMA)<\/strong>. \u0110\u00e2y l\u00e0 \u0111\u1ed9ng l\u1ef1c \u0111\u1eb1ng sau c\u00e1c m\u1ea1ng hi\u1ec7n \u0111\u1ea1i c\u00f3 \u0111\u1ed9 tr\u1ec5 th\u1ea5p v\u00e0 th\u00f4ng l\u01b0\u1ee3ng cao. H\u00e3y c\u00f9ng t\u00ecm hi\u1ec3u s\u00e2u h\u01a1n v\u1ec1 <strong>RDMA l\u00e0 g\u00ec<\/strong>, t\u1ea1i sao n\u00f3 quan tr\u1ecdng v\u00e0 c\u00e1ch n\u00f3 \u0111ang \u0111\u1ecbnh h\u00ecnh t\u01b0\u01a1ng lai c\u1ee7a c\u00e1c c\u00f4ng ngh\u1ec7 x\u1eed l\u00fd d\u1eef li\u1ec7u quy m\u00f4 l\u1edbn.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>\ud83d\udca1 Nh\u1eefng \u0111i\u1ec3m n\u1ed5i b\u1eadt<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>RDMA cho ph\u00e9p c\u00e1c m\u00e1y t\u00ednh g\u1eedi d\u1eef li\u1ec7u nhanh m\u00e0 kh\u00f4ng c\u1ea7n s\u1eed d\u1ee5ng CPU hay h\u1ec7 \u0111i\u1ec1u h\u00e0nh. \u0110i\u1ec1u n\u00e0y gi\u00fap t\u0103ng t\u1ed1c \u0111\u1ed9 v\u00e0 h\u1ed7 tr\u1ee3 truy\u1ec1n t\u1ea3i nhi\u1ec1u d\u1eef li\u1ec7u h\u01a1n c\u00f9ng l\u00fac.<\/p><\/li><li><p>M\u1ea1ng kh\u00f4ng sao ch\u00e9p (zero-copy networking) l\u00e0 m\u1ed9t th\u00e0nh ph\u1ea7n quan tr\u1ecdng c\u1ee7a RDMA. N\u00f3 cho ph\u00e9p d\u1eef li\u1ec7u di chuy\u1ec3n tr\u1ef1c ti\u1ebfp t\u1eeb b\u1ed9 nh\u1edb c\u1ee7a m\u00e1y t\u00ednh n\u00e0y sang b\u1ed9 nh\u1edb c\u1ee7a m\u00e1y t\u00ednh kh\u00e1c. Vi\u1ec7c n\u00e0y ti\u1ebft ki\u1ec7m th\u1eddi gian v\u00e0 ti\u00eau t\u1ed1n r\u1ea5t \u00edt t\u00e0i nguy\u00ean CPU.<\/p><\/li><li><p>RDMA ho\u1ea1t \u0111\u1ed9ng hi\u1ec7u qu\u1ea3 trong \u0111i\u1ec7n to\u00e1n hi\u1ec7u n\u0103ng cao, tr\u00ed tu\u1ec7 nh\u00e2n t\u1ea1o v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u00e1m m\u00e2y. N\u00f3 c\u00f3 th\u1ec3 di chuy\u1ec3n kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u l\u1edbn m\u1ed9t c\u00e1ch nhanh ch\u00f3ng v\u00e0 d\u1ec5 d\u00e0ng.<\/p><\/li><li><p>B\u1ea1n c\u1ea7n <strong>ph\u1ea7n c\u1ee9ng \u0111\u1eb7c bi\u1ec7t<\/strong>, ch\u1eb3ng h\u1ea1n nh\u01b0 card m\u1ea1ng RDMA, \u0111\u1ec3 RDMA ho\u1ea1t \u0111\u1ed9ng. H\u00e3y \u0111\u1ea3m b\u1ea3o thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n h\u1ed7 tr\u1ee3 RDMA tr\u01b0\u1edbc khi tri\u1ec3n khai.<\/p><\/li><li><p>C\u00e2n nh\u1eafc nh\u1eefng \u01b0u \u0111i\u1ec3m c\u1ee7a RDMA\u2014nh\u01b0 t\u1ed1c \u0111\u1ed9 cao h\u01a1n v\u00e0 ti\u1ebft ki\u1ec7m t\u00e0i nguy\u00ean\u2014khi quy\u1ebft \u0111\u1ecbnh xem n\u00f3 c\u00f3 ph\u00f9 h\u1ee3p v\u1edbi m\u1ea1ng c\u1ee7a b\u1ea1n hay kh\u00f4ng.<\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>\ud83d\udca1 RDMA th\u1ef1c ch\u1ea5t l\u00e0 g\u00ec? Kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">V\u1ec1 b\u1ea3n ch\u1ea5t, <strong>RDMA (Truy c\u1eadp b\u1ed9 nh\u1edb tr\u1ef1c ti\u1ebfp t\u1eeb xa)<\/strong> RDMA l\u00e0 m\u1ed9t c\u00f4ng ngh\u1ec7 m\u1ea1ng cho ph\u00e9p c\u00e1c m\u00e1y t\u00ednh trao \u0111\u1ed5i d\u1eef li\u1ec7u tr\u1ef1c ti\u1ebfp gi\u1eefa b\u1ed9 nh\u1edb ch\u00ednh c\u1ee7a ch\u00fang <strong>m\u00e0 kh\u00f4ng c\u1ea7n s\u1ef1 can thi\u1ec7p c\u1ee7a h\u1ec7 \u0111i\u1ec1u h\u00e0nh, CPU hay b\u1ed9 nh\u1edb \u0111\u1ec7m.<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">H\u00e3y h\u00ecnh dung nh\u01b0 sau:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p style=\"margin: 0px;\"><strong>M\u1ea1ng truy\u1ec1n th\u1ed1ng:<\/strong> M\u1ed9t g\u00f3i h\u00e0ng (d\u1eef li\u1ec7u) ph\u1ea3i \u0111i qua trung t\u00e2m ph\u00e2n lo\u1ea1i b\u01b0u ph\u1ea9m trung \u01b0\u01a1ng (CPU) \u0111\u1ec3 \u0111\u01b0\u1ee3c x\u1eed l\u00fd, d\u00e1n nh\u00e3n r\u1ed3i m\u1edbi g\u1eedi \u0111i. Vi\u1ec7c n\u00e0y t\u1ed1n th\u1eddi gian v\u00e0 t\u00e0i nguy\u00ean.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>M\u1ea1ng RDMA:<\/strong> G\u00f3i h\u00e0ng \u0111\u01b0\u1ee3c chuy\u1ec3n tr\u1ef1c ti\u1ebfp t\u1eeb tay ng\u01b0\u1eddi n\u00e0y (b\u1ed9 nh\u1edb) sang tay ng\u01b0\u1eddi kia ngay b\u00ean kia \u0111\u01b0\u1eddng, kh\u00f4ng c\u1ea7n b\u1ea5t k\u1ef3 b\u00ean trung gian n\u00e0o. \u0110\u00e2y l\u00e0 ph\u01b0\u01a1ng th\u1ee9c c\u1ef1c k\u1ef3 nhanh v\u00e0 hi\u1ec7u qu\u1ea3.<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Vi\u1ec7c \u201cb\u1ecf qua nh\u00e2n \u0111i\u1ec1u h\u00e0nh\u201d (kernel bypass) n\u00e0y ch\u00ednh l\u00e0 \u201cph\u00e9p m\u00e0u\u201d lo\u1ea1i b\u1ecf ph\u1ea7n l\u1edbn chi ph\u00ed v\u1eadn h\u00e0nh c\u1ee7a m\u1ea1ng truy\u1ec1n th\u1ed1ng.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" ><strong>RDMA Ho\u1ea1t \u0110\u1ed9ng Nh\u01b0 Th\u1ebf N\u00e0o? Ph\u00e9p M\u00e0u K\u1ef9 Thu\u1eadt<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">RDMA ho\u1ea1t \u0111\u1ed9ng th\u00f4ng qua m\u1ed9t thi\u1ebft b\u1ecb chuy\u00ean d\u1ee5ng <strong>Card Giao Ti\u1ebfp M\u1ea1ng (NIC)<\/strong> th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 <strong>NIC h\u1ed7 tr\u1ee3 RDMA<\/strong> or <strong>B\u1ed9 \u0111i\u1ec1u h\u1ee3p k\u00eanh ch\u1ee7 (HCA)<\/strong>. Ph\u1ea7n c\u1ee9ng chuy\u00ean bi\u1ec7t n\u00e0y x\u1eed l\u00fd c\u00e1c thao t\u00e1c truy\u1ec1n d\u1eef li\u1ec7u m\u1ed9t c\u00e1ch \u0111\u1ed9c l\u1eadp.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Qu\u00e1 tr\u00ecnh n\u00e0y bao g\u1ed3m m\u1ed9t m\u00e1y t\u00ednh (b\u00ean <strong>y\u00eau c\u1ea7u<\/strong>) \u0111\u1ecdc tr\u1ef1c ti\u1ebfp t\u1eeb ho\u1eb7c ghi tr\u1ef1c ti\u1ebfp v\u00e0o b\u1ed9 nh\u1edb c\u1ee7a m\u1ed9t m\u00e1y t\u00ednh kh\u00e1c (b\u00ean <strong>ph\u1ea3n h\u1ed3i<\/strong>), sau khi m\u1ed9t k\u1ebft n\u1ed1i an to\u00e0n \u0111\u00e3 \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp. To\u00e0n b\u1ed9 qu\u00e1 tr\u00ecnh n\u00e0y \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd b\u1edfi c\u00e1c HCA \u1edf m\u1ed7i \u0111\u1ea7u, v\u1edbi m\u1ee9c \u0111\u1ed9 can thi\u1ec7p t\u1ed1i thi\u1ec3u t\u1eeb CPU.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>\ud83d\udca1 V\u00ec Sao RDMA L\u00e0 M\u1ed9t Cu\u1ed9c C\u00e1ch M\u1ea1ng? C\u00e1c L\u1ee3i Th\u1ebf &amp; \u01afu \u0110i\u1ec3m Ch\u00ednh<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Vi\u1ec7c \u00e1p d\u1ee5ng c\u00f4ng ngh\u1ec7 RDMA mang l\u1ea1i nh\u1eefng l\u1ee3i th\u1ebf s\u00e2u s\u1eafc cho c\u00e1c m\u00f4i tr\u01b0\u1eddng \u0111\u00f2i h\u1ecfi hi\u1ec7u n\u0103ng cao:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p style=\"margin: 0px;\"><strong>\ud83d\udd25 \u0110\u1ed9 tr\u1ec5 c\u1ef1c th\u1ea5p:<\/strong> B\u1eb1ng c\u00e1ch b\u1ecf qua CPU v\u00e0 nh\u00e2n h\u1ec7 \u0111i\u1ec1u h\u00e0nh, \u0111\u1ed9 tr\u1ec5 truy\u1ec1n d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c gi\u1ea3m \u0111\u00e1ng k\u1ec3.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>\u26a1 Th\u00f4ng l\u01b0\u1ee3ng cao:<\/strong> RDMA cho ph\u00e9p truy\u1ec1n d\u1eef li\u1ec7u g\u1ea7n b\u1eb1ng t\u1ed1c \u0111\u1ed9 \u0111\u01b0\u1eddng truy\u1ec1n v\u1eadt l\u00fd, khai th\u00e1c t\u1ed1i \u0111a b\u0103ng th\u00f4ng c\u1ee7a c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng m\u1ea1ng.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>\ud83d\udcaa Gi\u1ea3m t\u1ea3i CPU:<\/strong> CPU \u0111\u01b0\u1ee3c gi\u1ea3i ph\u00f3ng kh\u1ecfi c\u00e1c t\u00e1c v\u1ee5 x\u1eed l\u00fd m\u1ea1ng, cho ph\u00e9p n\u00f3 t\u1eadp trung to\u00e0n b\u1ed9 n\u0103ng l\u1ef1c v\u00e0o vi\u1ec7c ch\u1ea1y c\u00e1c \u1ee9ng d\u1ee5ng v\u00e0 d\u1ecbch v\u1ee5.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>\ud83d\ude80 Hi\u1ec7u qu\u1ea3 &amp; Kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng cao h\u01a1n:<\/strong> H\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 x\u1eed l\u00fd nhi\u1ec1u d\u1eef li\u1ec7u v\u00e0 nhi\u1ec1u k\u1ebft n\u1ed1i h\u01a1n m\u00e0 kh\u00f4ng b\u1ecb ch\u1eadm l\u1ea1i do x\u1eed l\u00fd giao th\u1ee9c m\u1ea1ng.<\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>\ud83d\udca1 C\u00e1c Giao Th\u1ee9c Truy\u1ec1n T\u1ea3i RDMA: InfiniBand, RoCE v\u00e0 iWARP<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">RDMA kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t ti\u00eau chu\u1ea9n duy nh\u1ea5t; n\u00f3 c\u00f3 th\u1ec3 ch\u1ea1y tr\u00ean c\u00e1c m\u1ea1ng v\u1eadt l\u00fd kh\u00e1c nhau. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 b\u1ea3ng so s\u00e1nh nhanh ba giao th\u1ee9c truy\u1ec1n t\u1ea3i ch\u00ednh:<\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\"><p><strong>Giao th\u1ee9c<\/strong><\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p><strong>T\u00ean \u0111\u1ea7y \u0111\u1ee7<\/strong><\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p><strong>M\u00f4i tr\u01b0\u1eddng m\u1ea1ng<\/strong><\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p><strong>\u0110\u1eb7c \u0111i\u1ec3m ch\u00ednh<\/strong><\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>InfiniBand<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>\u2014<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>C\u01a1 s\u1edf h\u1ea1 t\u1ea7ng InfiniBand g\u1ed1c<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>\u2b50 <strong>RDMA g\u1ed1c.<\/strong> Hi\u1ec7u n\u0103ng cao nh\u1ea5t, \u0111\u1ed9 tr\u1ec5 th\u1ea5p nh\u1ea5t. Y\u00eau c\u1ea7u c\u00e1c b\u1ed9 chuy\u1ec3n m\u1ea1ch InfiniBand chuy\u00ean d\u1ee5ng.<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>RoCE<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p><strong>RDMA qua Ethernet h\u1ed9i t\u1ee5<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Ethernet<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>\ud83d\ude80 <strong>RDMA qua Ethernet.<\/strong> L\u1ef1a ch\u1ecdn ph\u1ed5 bi\u1ebfn trong c\u00e1c trung t\u00e2m d\u1eef li\u1ec7u hi\u1ec7n \u0111\u1ea1i. C\u00f3 hai phi\u00ean b\u1ea3n: RoCEv1 (l\u1edbp li\u00ean k\u1ebft) v\u00e0 RoCEv2 (c\u00f3 th\u1ec3 \u0111\u1ecbnh tuy\u1ebfn qua IP).<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\"><p><strong>iWARP<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p><strong>Giao th\u1ee9c RDMA di\u1ec7n r\u1ed9ng tr\u00ean Internet<\/strong><\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Ethernet (TCP)<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>\ud83c\udf10 <strong>RDMA qua TCP\/IP.<\/strong> \u0110\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ho\u1ea1t \u0111\u1ed9ng tr\u00ean c\u00e1c m\u1ea1ng ti\u00eau chu\u1ea9n, d\u1ec5 m\u1ea5t g\u00f3i nh\u01b0 m\u1ea1ng WAN. C\u1ea5u h\u00ecnh \u0111\u01a1n gi\u1ea3n h\u01a1n RoCE nh\u01b0ng c\u00f3 th\u1ec3 g\u00e2y \u0111\u1ed9 tr\u1ec5 cao h\u01a1n.<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>RoCE<\/strong> (\u0111\u1eb7c bi\u1ec7t l\u00e0 RoCEv2) \u0111\u00e3 tr\u1edf th\u00e0nh l\u1ef1c l\u01b0\u1ee3ng th\u1ed1ng tr\u1ecb trong c\u00e1c trung t\u00e2m d\u1eef li\u1ec7u doanh nghi\u1ec7p v\u00ec t\u1eadn d\u1ee5ng c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng Ethernet ph\u1ed5 bi\u1ebfn \u0111\u1ed3ng th\u1eddi cung c\u1ea5p hi\u1ec7u n\u0103ng g\u1ea7n b\u1eb1ng InfiniBand.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>\ud83d\udca1 RDMA \u0110\u01af\u1ee2C S\u1eec D\u1ee4NG \u1ede \u0110\u00c2U? C\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">RDMA kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t c\u00f4ng ngh\u1ec7 ph\u00f2ng th\u00ed nghi\u1ec7m; n\u00f3 mang t\u00ednh then ch\u1ed1t \u0111\u1ed1i v\u1edbi c\u00e1c kh\u1ed1i l\u01b0\u1ee3ng c\u00f4ng vi\u1ec7c \u0111\u00f2i h\u1ecfi cao nh\u1ea5t ng\u00e0y nay:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p style=\"margin: 0px;\"><strong>Tr\u00ed tu\u1ec7 nh\u00e2n t\u1ea1o (AI) v\u00e0 H\u1ecdc m\u00e1y (ML):<\/strong> Vi\u1ec7c hu\u1ea5n luy\u1ec7n c\u00e1c m\u00f4 h\u00ecnh ph\u1ee9c t\u1ea1p \u0111\u00f2i h\u1ecfi ph\u1ea3i di chuy\u1ec3n c\u00e1c t\u1eadp d\u1eef li\u1ec7u kh\u1ed5ng l\u1ed3 gi\u1eefa c\u00e1c m\u00e1y ch\u1ee7 v\u00e0 GPU v\u1edbi t\u1ed1c \u0111\u1ed9 c\u1ef1c k\u1ef3 cao.<\/p><\/li><li><p style=\"margin: 0px;\"><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/what-is-hpc-high-performance-computing\/\"><strong>\u0110i\u1ec7n to\u00e1n hi\u1ec7u n\u0103ng cao (HPC)<\/strong><\/a><strong>:<\/strong> C\u00e1c m\u00f4 ph\u1ecfng v\u00e0 m\u00f4 h\u00ecnh khoa h\u1ecdc ph\u1ee5 thu\u1ed9c v\u00e0o vi\u1ec7c truy\u1ec1n th\u00f4ng \u0111i\u1ec7p nhanh gi\u1eefa c\u00e1c n\u00fat t\u00ednh to\u00e1n (v\u00ed d\u1ee5: trong c\u00e1c \u1ee9ng d\u1ee5ng MPI).<\/p><\/li><li><p style=\"margin: 0px;\"><strong>C\u01a1 s\u1edf h\u1ea1 t\u1ea7ng si\u00eau h\u1ed9i t\u1ee5 (HCI) v\u00e0 L\u01b0u tr\u1eef:<\/strong> C\u00e1c c\u00f4ng ngh\u1ec7 nh\u01b0 VMware vSAN, Azure Stack HCI v\u00e0 <strong>c\u00e1c gi\u1ea3i ph\u00e1p l\u01b0u tr\u1eef<\/strong> s\u1eed d\u1ee5ng RDMA \u0111\u1ec3 \u0111\u1ea1t m\u1ea1ng l\u01b0u tr\u1eef si\u00eau nhanh v\u00e0 l\u01b0u tr\u1eef ph\u00e2n t\u00e1n.<\/p><\/li><li><p style=\"margin: 0px;\"><strong>Trung t\u00e2m d\u1eef li\u1ec7u \u0111\u00e1m m\u00e2y:<\/strong> C\u00e1c nh\u00e0 cung c\u1ea5p l\u1edbn nh\u01b0 Google, AWS v\u00e0 Microsoft s\u1eed d\u1ee5ng RDMA nh\u1eb1m n\u00e2ng cao hi\u1ec7u qu\u1ea3 v\u00e0 hi\u1ec7u n\u0103ng cho c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng n\u1ed9i b\u1ed9 c\u0169ng nh\u01b0 d\u1ecbch v\u1ee5 \u0111\u00e1m m\u00e2y c\u1ee7a h\u1ecd.<\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>\ud83d\udca1 Vai tr\u00f2 then ch\u1ed1t c\u1ee7a quang h\u1ecdc t\u1ed1c \u0111\u1ed9 cao trong RDMA<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/44d4bbca12234ce3a2bd2246e96cc61b.webp\" alt=\"OPTICAL TRANSCEIVER\" class=\"wp-image-4047\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/44d4bbca12234ce3a2bd2246e96cc61b.webp 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/44d4bbca12234ce3a2bd2246e96cc61b-300x169.webp 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/44d4bbca12234ce3a2bd2246e96cc61b-1024x576.webp 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/44d4bbca12234ce3a2bd2246e96cc61b-768x432.webp 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/44d4bbca12234ce3a2bd2246e96cc61b-18x10.webp 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed9t <strong>M\u1ea1ng RDMA<\/strong> ch\u1ec9 nhanh b\u1eb1ng th\u00e0nh ph\u1ea7n ch\u1eadm nh\u1ea5t c\u1ee7a n\u00f3. <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-26044-200-400-800g-transceiver-modules.htm\"><strong>B\u1ed9 thu ph\u00e1t quang t\u1ed1c \u0111\u1ed9 cao<\/strong><\/a> l\u00e0 nh\u1eefng \u201canh h\u00f9ng th\u1ea7m l\u1eb7ng\u201d th\u1ef1c s\u1ef1 cho ph\u00e9p thi\u1ebft l\u1eadp c\u00e1c k\u1ebft n\u1ed1i nhanh nh\u01b0 ch\u1edbp n\u00e0y qua <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/fiber-optic-cable-what-it-is-and-how-it-works-explained\/\"><strong>c\u00e1p quang<\/strong><\/a>. \u0110\u1ec3 m\u1ea1ng RDMA \u0111\u1ea1t \u0111\u01b0\u1ee3c ti\u1ec1m n\u0103ng t\u1ed1i \u0111a c\u1ee7a n\u00f3, \u0111\u1eb7c bi\u1ec7t tr\u00ean c\u00e1c li\u00ean k\u1ebft 100G, 200G ho\u1eb7c 400G, b\u1ea1n c\u1ea7n c\u00e1c th\u00e0nh ph\u1ea7n quang h\u1ecdc \u0111\u00e1ng tin c\u1eady v\u00e0 hi\u1ec7u n\u0103ng cao.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u00e2y l\u00e0 n\u01a1i m\u1ed9t th\u01b0\u01a1ng hi\u1ec7u nh\u01b0 <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-25432-optics-transceivers-sfp-modules.htm\"><strong>LINK-PP<\/strong><\/a> t\u1ecfa s\u00e1ng. <strong>LINK-PP <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-25432-optics-transceivers-sfp-modules.htm\"><strong>b\u1ed9 thu ph\u00e1t quang<\/strong><\/a> \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 \u0111\u1ea1t hi\u1ec7u n\u0103ng v\u00e0 kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch t\u1ed1i \u0111a, \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u1ea1ng \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t RDMA c\u1ee7a b\u1ea1n ho\u1ea1t \u0111\u1ed9ng \u1edf hi\u1ec7u su\u1ea5t \u0111\u1ec9nh m\u00e0 kh\u00f4ng g\u1eb7p ngh\u1ebdn c\u1ed5 chai.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ed1i v\u1edbi tri\u1ec3n khai RoCE 400G, m\u1ed9t module nh\u01b0 <strong>LINK-PP 400G-ZR4+<\/strong> l\u00e0 b\u1ed9 thu ph\u00e1t quang c\u1eafm r\u1eddi \u0111i\u1ec1u ch\u1ebf \u0111\u1ed3ng pha (coherent pluggable transceiver) \u2014 l\u1ef1a ch\u1ecdn tuy\u1ec7t v\u1eddi cho c\u00e1c k\u1ebft n\u1ed1i li\u00ean v\u00f9ng xa, cung c\u1ea5p t\u1ea7m ph\u1ee7 s\u00f3ng v\u00e0 \u0111\u1ed9 to\u00e0n v\u1eb9n t\u00edn hi\u1ec7u c\u1ea7n thi\u1ebft cho c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng v\u1eefng ch\u1eafc.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>\ud83d\udca1 K\u1ebft lu\u1eadn: RDMA l\u00e0 T\u01b0\u01a1ng lai c\u1ee7a M\u1ea1ng Trung t\u00e2m D\u1eef li\u1ec7u<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>RDMA<\/strong> \u0111\u00e3 ph\u00e1t tri\u1ec3n t\u1eeb m\u1ed9t c\u00f4ng ngh\u1ec7 chuy\u00ean bi\u1ec7t th\u00e0nh m\u1ed9t tr\u1ee5 c\u1ed9t n\u1ec1n t\u1ea3ng trong thi\u1ebft k\u1ebf trung t\u00e2m d\u1eef li\u1ec7u hi\u1ec7n \u0111\u1ea1i. Kh\u1ea3 n\u0103ng cung c\u1ea5p <strong>m\u1ea1ng \u0111\u1ed9 tr\u1ec5 th\u1ea5p<\/strong>, <strong>b\u0103ng th\u00f4ng cao<\/strong>, and <strong>hi\u1ec7u qu\u1ea3 s\u1eed d\u1ee5ng CPU xu\u1ea5t s\u1eafc<\/strong> khi\u1ebfn RDMA tr\u1edf n\u00ean kh\u00f4ng th\u1ec3 thi\u1ebfu \u0111\u1ed1i v\u1edbi AI, \u0111i\u1ec7n to\u00e1n hi\u1ec7u n\u0103ng cao (HPC) v\u00e0 c\u00e1c m\u00f4i tr\u01b0\u1eddng l\u01b0u tr\u1eef quy m\u00f4 l\u1edbn.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ec3 x\u00e2y d\u1ef1ng m\u1ed9t m\u1ea1ng hi\u1ec7u n\u0103ng cao th\u1ef1c s\u1ef1 t\u1eeb \u0111\u1ea7u \u0111\u1ebfn cu\u1ed1i, vi\u1ec7c k\u1ebft h\u1ee3p c\u00e1c card giao di\u1ec7n m\u1ea1ng (NIC) v\u00e0 b\u1ed9 chuy\u1ec3n m\u1ea1ch \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t RDMA c\u00f9ng c\u00e1c th\u00e0nh ph\u1ea7n quang h\u1ecdc h\u00e0ng \u0111\u1ea7u t\u1eeb c\u00e1c chuy\u00ean gia nh\u01b0 <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/page\/aboutus.htm\"><strong>LINK-PP<\/strong><\/a> kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t l\u1ef1a ch\u1ecdn \u2014 m\u00e0 l\u00e0 m\u1ed9t y\u00eau c\u1ea7u b\u1eaft bu\u1ed9c.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>\ud83d\udca1 C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p (FAQ)<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" >RDMA \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u00e0o m\u1ee5c \u0111\u00edch g\u00ec?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1ea1n s\u1eed d\u1ee5ng RDMA \u0111\u1ec3 di chuy\u1ec3n d\u1eef li\u1ec7u nhanh gi\u1eefa c\u00e1c m\u00e1y t\u00ednh. N\u00f3 h\u1ed7 tr\u1ee3 <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/what-is-cloud-computing-access-servers-storage-apps-online\/\">\u0111i\u1ec7n to\u00e1n \u0111\u00e1m m\u00e2y<\/a>, AI v\u00e0 m\u1ea1ng l\u01b0u tr\u1eef. B\u1ea1n \u0111\u1ea1t t\u1ed1c \u0111\u1ed9 nhanh h\u01a1n v\u00e0 th\u1eddi gian ch\u1edd th\u1ea5p h\u01a1n so v\u1edbi c\u00e1c ph\u01b0\u01a1ng ph\u00e1p m\u1ea1ng c\u0169.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >B\u1ea1n c\u1ea7n ph\u1ea7n c\u1ee9ng n\u00e0o \u0111\u1ec3 tri\u1ec3n khai RDMA?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1ea1n c\u1ea7n c\u00e1c card m\u1ea1ng h\u1ed7 tr\u1ee3 RDMA v\u00e0 c\u00e1c b\u1ed9 chuy\u1ec3n m\u1ea1ch \u0111\u1eb7c bi\u1ec7t. C\u00e1c card m\u1ea1ng th\u00f4ng th\u01b0\u1eddng kh\u00f4ng h\u1ed7 tr\u1ee3 RDMA. H\u00e3y \u0111\u1ea3m b\u1ea3o m\u00e1y ch\u1ee7 v\u00e0 thi\u1ebft b\u1ecb m\u1ea1ng c\u1ee7a b\u1ea1n t\u01b0\u01a1ng th\u00edch v\u1edbi RDMA tr\u01b0\u1edbc khi n\u00e2ng c\u1ea5p.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >\u0110i\u1ec1u g\u00ec l\u00e0m RDMA kh\u00e1c bi\u1ec7t so v\u1edbi m\u1ea1ng th\u00f4ng th\u01b0\u1eddng?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">RDMA cho ph\u00e9p b\u1ea1n g\u1eedi d\u1eef li\u1ec7u tr\u1ef1c ti\u1ebfp t\u1eeb b\u1ed9 nh\u1edb c\u1ee7a m\u1ed9t m\u00e1y t\u00ednh sang b\u1ed9 nh\u1edb c\u1ee7a m\u00e1y t\u00ednh kh\u00e1c, b\u1ecf qua CPU v\u00e0 h\u1ec7 \u0111i\u1ec1u h\u00e0nh. M\u1ea1ng th\u00f4ng th\u01b0\u1eddng \u0111\u00f2i h\u1ecfi nhi\u1ec1u b\u01b0\u1edbc h\u01a1n v\u00e0 m\u1ea5t nhi\u1ec1u th\u1eddi gian h\u01a1n.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Giao th\u1ee9c RDMA tr\u00ean di\u1ec7n r\u1ed9ng Internet l\u00e0 g\u00ec?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Giao th\u1ee9c RDMA tr\u00ean di\u1ec7n r\u1ed9ng Internet cho ph\u00e9p b\u1ea1n s\u1eed d\u1ee5ng RDMA tr\u00ean kho\u1ea3ng c\u00e1ch xa. B\u1ea1n c\u00f3 th\u1ec3 k\u1ebft n\u1ed1i c\u00e1c m\u00e1y t\u00ednh \u1edf c\u00e1c v\u1ecb tr\u00ed kh\u00e1c nhau v\u00e0 v\u1eabn \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u1ed1c \u0111\u1ed9 di chuy\u1ec3n d\u1eef li\u1ec7u nhanh.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" >Nh\u1eefng l\u1ee3i \u00edch ch\u00ednh c\u1ee7a RDMA l\u00e0 g\u00ec?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1ea1n \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u1ed1c \u0111\u1ed9 cao, \u0111\u1ed9 tr\u1ec5 th\u1ea5p v\u00e0 m\u1ee9c s\u1eed d\u1ee5ng CPU gi\u1ea3m. RDMA gi\u00fap h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n x\u1eed l\u00fd nhi\u1ec1u t\u00e1c v\u1ee5 \u0111\u1ed3ng th\u1eddi h\u01a1n. M\u1ea1ng c\u1ee7a b\u1ea1n v\u1eadn h\u00e0nh hi\u1ec7u qu\u1ea3 h\u01a1n cho d\u1eef li\u1ec7u l\u1edbn v\u00e0 c\u00e1c t\u00e1c v\u1ee5 th\u1eddi gian th\u1ef1c.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" ><strong>\ud83d\udca1 Xem th\u00eam<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/essential-role-roadm-cloud-networks\/\">T\u1ea7m quan tr\u1ecdng c\u1ee7a ROADM trong M\u1ea1ng \u0110i\u1ec7n to\u00e1n \u0110\u00e1m m\u00e2y Hi\u1ec7n \u0111\u1ea1i<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/ddm-dom-in-optical-transceivers\/\">\u00dd ngh\u0129a c\u1ee7a Gi\u00e1m s\u00e1t K\u1ef9 thu\u1eadt s\u1ed1 trong B\u1ed9 Thu Ph\u00e1t Quang<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/wdm-optical-transceiver-module-applications\/\">Kh\u00e1m ph\u00e1 C\u00f4ng ngh\u1ec7 WDM v\u00e0 \u1ee8ng d\u1ee5ng c\u1ee7a n\u00f3 trong M\u1ea1ng<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/knowledge-center\/qsfp-dd-optical-transceivers-faster-connections\/\">B\u1ed9 Thu Ph\u00e1t Quang QSFP-DD: H\u1ed7 tr\u1ee3 K\u1ebft n\u1ed1i D\u1eef li\u1ec7u T\u1ed1c \u0111\u1ed9 Cao<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Truy c\u1eadp b\u1ed9 nh\u1edb tr\u1ef1c ti\u1ebfp t\u1eeb xa (RDMA) t\u0103ng t\u1ed1c \u0111\u1ed9 truy\u1ec1n d\u1eef li\u1ec7u, gi\u1ea3m \u0111\u1ed9 tr\u1ec5 v\u00e0 gi\u1ea3m m\u1ee9c s\u1eed d\u1ee5ng CPU cho \u0111i\u1ec7n to\u00e1n hi\u1ec7u n\u0103ng cao v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u00e1m m\u00e2y.<\/p>","protected":false},"author":1,"featured_media":4046,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[27],"tags":[26],"class_list":["post-4048","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-glossary","tag-optics-transceivers"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts\/4048","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/comments?post=4048"}],"version-history":[{"count":5,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts\/4048\/revisions"}],"predecessor-version":[{"id":11192,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts\/4048\/revisions\/11192"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/media\/4046"}],"wp:attachment":[{"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/media?parent=4048"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/categories?post=4048"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/tags?post=4048"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}