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authorTony Lu <tonylu@linux.alibaba.com>2022-09-20 12:52:22 +0300
committerPaolo Abeni <pabeni@redhat.com>2022-09-22 13:58:21 +0300
commit0227f058aa29f5ab6f6ec79c3a36ae41f1e03a13 (patch)
tree024a70c93ec33d4e59ad7457e1a8856bbf371770 /Documentation/networking/smc-sysctl.rst
parent77eee32514314209961af5c2982e871ecb364445 (diff)
downloadlinux-0227f058aa29f5ab6f6ec79c3a36ae41f1e03a13.tar.xz
net/smc: Unbind r/w buffer size from clcsock and make them tunable
Currently, SMC uses smc->sk.sk_{rcv|snd}buf to create buffers for send buffer and RMB. And the values of buffer size are from tcp_{w|r}mem in clcsock. The buffer size from TCP socket doesn't fit SMC well. Generally, buffers are usually larger than TCP for SMC-R/-D to get higher performance, for they are different underlay devices and paths. So this patch unbinds buffer size from TCP, and introduces two sysctl knobs to tune them independently. Also, these knobs are per net namespace and work for containers. Signed-off-by: Tony Lu <tonylu@linux.alibaba.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'Documentation/networking/smc-sysctl.rst')
-rw-r--r--Documentation/networking/smc-sysctl.rst18
1 files changed, 18 insertions, 0 deletions
diff --git a/Documentation/networking/smc-sysctl.rst b/Documentation/networking/smc-sysctl.rst
index 45ba1522e189..6d8acdbe9be1 100644
--- a/Documentation/networking/smc-sysctl.rst
+++ b/Documentation/networking/smc-sysctl.rst
@@ -41,3 +41,21 @@ smcr_testlink_time - INTEGER
disabling TEST_LINK.
Default: 30 seconds.
+
+wmem - INTEGER
+ Initial size of send buffer used by SMC sockets.
+ The default value inherits from net.ipv4.tcp_wmem[1].
+
+ The minimum value is 16KiB and there is no hard limit for max value, but
+ only allowed 512KiB for SMC-R and 1MiB for SMC-D.
+
+ Default: 16K
+
+rmem - INTEGER
+ Initial size of receive buffer (RMB) used by SMC sockets.
+ The default value inherits from net.ipv4.tcp_rmem[1].
+
+ The minimum value is 16KiB and there is no hard limit for max value, but
+ only allowed 512KiB for SMC-R and 1MiB for SMC-D.
+
+ Default: 128K