From: Leon Romanovsky <leon@kernel.org>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: Vlad Dumitrescu <vdumitrescu@nvidia.com>,
linux-rdma@vger.kernel.org, Sean Hefty <shefty@nvidia.com>
Subject: [PATCH rdma-next 9/9] IB/cma: Lower response timeout to roughly 1s
Date: Thu, 5 Dec 2024 15:49:39 +0200 [thread overview]
Message-ID: <7ff4bf69f132a204570eded9ff6788316df3e3b4.1733405453.git.leon@kernel.org> (raw)
In-Reply-To: <cover.1733405453.git.leon@kernel.org>
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(-)
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
--
2.47.0
prev parent reply other threads:[~2024-12-05 13:51 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-05 13:49 [PATCH rdma-next 0/9] Rework retry algorithm used when sending MADs Leon Romanovsky
2024-12-05 13:49 ` [PATCH rdma-next 1/9] IB/mad: Apply timeout modification (CM MRA) only once Leon Romanovsky
2024-12-05 13:49 ` [PATCH rdma-next 2/9] IB/mad: Add deadline for send MADs Leon Romanovsky
2024-12-05 13:49 ` [PATCH rdma-next 3/9] RDMA/sa_query: Enforce min retry interval and deadline Leon Romanovsky
2024-12-05 13:49 ` [PATCH rdma-next 4/9] RDMA/nldev: Add sa-min-timeout management attribute Leon Romanovsky
2024-12-05 13:49 ` [PATCH rdma-next 5/9] IB/umad: Set deadline when sending non-RMPP MADs Leon Romanovsky
2024-12-05 13:49 ` [PATCH rdma-next 6/9] IB/cm: Set deadline when sending MADs Leon Romanovsky
2024-12-05 13:49 ` [PATCH rdma-next 7/9] IB/mad: Exponential backoff when retrying sends Leon Romanovsky
2024-12-05 13:49 ` [PATCH rdma-next 8/9] RDMA/nldev: Add mad-linear-timeouts management attribute Leon Romanovsky
2024-12-05 13:49 ` Leon Romanovsky [this message]
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