62 lines
1.9 KiB
ReStructuredText
62 lines
1.9 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
|
|
|
|
==========
|
|
SMC Sysctl
|
|
==========
|
|
|
|
/proc/sys/net/smc/* Variables
|
|
=============================
|
|
|
|
autocorking_size - INTEGER
|
|
Setting SMC auto corking size:
|
|
SMC auto corking is like TCP auto corking from the application's
|
|
perspective of view. When applications do consecutive small
|
|
write()/sendmsg() system calls, we try to coalesce these small writes
|
|
as much as possible, to lower total amount of CDC and RDMA Write been
|
|
sent.
|
|
autocorking_size limits the maximum corked bytes that can be sent to
|
|
the under device in 1 single sending. If set to 0, the SMC auto corking
|
|
is disabled.
|
|
Applications can still use TCP_CORK for optimal behavior when they
|
|
know how/when to uncork their sockets.
|
|
|
|
Default: 64K
|
|
|
|
smcr_buf_type - INTEGER
|
|
Controls which type of sndbufs and RMBs to use in later newly created
|
|
SMC-R link group. Only for SMC-R.
|
|
|
|
Default: 0 (physically contiguous sndbufs and RMBs)
|
|
|
|
Possible values:
|
|
|
|
- 0 - Use physically contiguous buffers
|
|
- 1 - Use virtually contiguous buffers
|
|
- 2 - Mixed use of the two types. Try physically contiguous buffers first.
|
|
If not available, use virtually contiguous buffers then.
|
|
|
|
smcr_testlink_time - INTEGER
|
|
How frequently SMC-R link sends out TEST_LINK LLC messages to confirm
|
|
viability, after the last activity of connections on it. Value 0 means
|
|
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
|