From: Mahanta Jambigi <mjambigi@linux.ibm.com>
To: andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com,
kuba@kernel.org, pabeni@redhat.com, alibuda@linux.alibaba.com,
dust.li@linux.alibaba.com, sidraya@linux.ibm.com,
wenjia@linux.ibm.com
Cc: pasic@linux.ibm.com, horms@kernel.org, tonylu@linux.alibaba.com,
guwen@linux.alibaba.com, netdev@vger.kernel.org,
linux-s390@vger.kernel.org,
Mahanta Jambigi <mjambigi@linux.ibm.com>
Subject: [PATCH net-next] Documentation: net/smc: correct old value of smcr_max_recv_wr
Date: Wed, 22 Apr 2026 10:51:58 +0200 [thread overview]
Message-ID: <20260422085159.459678-1-mjambigi@linux.ibm.com> (raw)
The smc-sysctl.rst documentation incorrectly stated that the previous
hardcoded maximum number of WR buffers on the receive path (smcr_max_recv_wr)
was 16. The correct historical value used before the introduction of the sysctl
control was 48. Update the documentation to reflect the accurate default value.
Fixes: aef3cdb47bbb net/smc: make wr buffer count configurable
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Sidraya Jayagond <sidraya@linux.ibm.com>
Signed-off-by: Mahanta Jambigi <mjambigi@linux.ibm.com>
---
Documentation/networking/smc-sysctl.rst | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/Documentation/networking/smc-sysctl.rst b/Documentation/networking/smc-sysctl.rst
index 904a910f198e..279d15e61899 100644
--- a/Documentation/networking/smc-sysctl.rst
+++ b/Documentation/networking/smc-sysctl.rst
@@ -100,14 +100,14 @@ smcr_max_recv_wr - INTEGER
depending on the workload it can be a bottleneck in a sense that threads
have to wait for work request buffers to become available. Before the
introduction of this control the maximal number of work request buffers
- available on the receive path used to be hard coded to 16. With this control
+ available on the receive path used to be hard coded to 48. With this control
it becomes configurable. The acceptable range is between 2 and 2048.
Please be aware that all the buffers need to be allocated as a physically
continuous array in which each element is a single buffer and has the size
of SMC_WR_BUF_SIZE (48) bytes. If the allocation fails, we keep retrying
with half of the buffer count until it is ether successful or (unlikely)
- we dip below the old hard coded value which is 16 where we give up much
+ we dip below the old hard coded value which is 48 where we give up much
like before having this control.
Default: 48
--
2.51.0
reply other threads:[~2026-04-22 8:52 UTC|newest]
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