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[rdma-next,9/9] IB/cma: Lower response timeout to roughly 1s

Message ID 7ff4bf69f132a204570eded9ff6788316df3e3b4.1733405453.git.leon@kernel.org (mailing list archive)
State New
Headers show
Series Rework retry algorithm used when sending MADs | expand

Commit Message

Leon Romanovsky Dec. 5, 2024, 1:49 p.m. UTC 
From: Vlad Dumitrescu <vdumitrescu@nvidia.com>

Current CMA_CM_RESPONSE_TIMEOUT converts to 4096ms, which is high for
(low latency) RDMA networks.  Match TCP's initial RTO of 1s (RFC 6298).

Rely on the recently added MAD layer exponential backoff to
counter-balance this reduction in case of persistent loss.

Signed-off-by: Vlad Dumitrescu <vdumitrescu@nvidia.com>
Reviewed-by: Sean Hefty <shefty@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
 drivers/infiniband/core/cma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 64ace0b968f0..ec4141b84351 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -44,7 +44,7 @@  MODULE_AUTHOR("Sean Hefty");
 MODULE_DESCRIPTION("Generic RDMA CM Agent");
 MODULE_LICENSE("Dual BSD/GPL");
 
-#define CMA_CM_RESPONSE_TIMEOUT 20
+#define CMA_CM_RESPONSE_TIMEOUT 18
 #define CMA_MAX_CM_RETRIES 15
 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
 #define CMA_IBOE_PACKET_LIFETIME 16