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1f2c9dd73f
Add a new sysctl: net.smc.smcr_max_conns_per_lgr, which is used to control the preferred max connections per lgr for SMC-R v2.1. The default value of this sysctl is 255, and the acceptable value ranges from 16 to 255. Signed-off-by: Guangguan Wang <guangguan.wang@linux.alibaba.com> Reviewed-by: Dust Li <dust.li@linux.alibaba.com> Signed-off-by: David S. Miller <davem@davemloft.net>
74 lines
2.3 KiB
ReStructuredText
74 lines
2.3 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
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==========
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SMC Sysctl
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==========
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/proc/sys/net/smc/* Variables
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=============================
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autocorking_size - INTEGER
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Setting SMC auto corking size:
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SMC auto corking is like TCP auto corking from the application's
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perspective of view. When applications do consecutive small
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write()/sendmsg() system calls, we try to coalesce these small writes
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as much as possible, to lower total amount of CDC and RDMA Write been
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sent.
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autocorking_size limits the maximum corked bytes that can be sent to
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the under device in 1 single sending. If set to 0, the SMC auto corking
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is disabled.
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Applications can still use TCP_CORK for optimal behavior when they
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know how/when to uncork their sockets.
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Default: 64K
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smcr_buf_type - INTEGER
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Controls which type of sndbufs and RMBs to use in later newly created
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SMC-R link group. Only for SMC-R.
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Default: 0 (physically contiguous sndbufs and RMBs)
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Possible values:
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- 0 - Use physically contiguous buffers
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- 1 - Use virtually contiguous buffers
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- 2 - Mixed use of the two types. Try physically contiguous buffers first.
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If not available, use virtually contiguous buffers then.
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smcr_testlink_time - INTEGER
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How frequently SMC-R link sends out TEST_LINK LLC messages to confirm
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viability, after the last activity of connections on it. Value 0 means
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disabling TEST_LINK.
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Default: 30 seconds.
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wmem - INTEGER
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Initial size of send buffer used by SMC sockets.
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The minimum value is 16KiB and there is no hard limit for max value, but
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only allowed 512KiB for SMC-R and 1MiB for SMC-D.
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Default: 64KiB
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rmem - INTEGER
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Initial size of receive buffer (RMB) used by SMC sockets.
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The minimum value is 16KiB and there is no hard limit for max value, but
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only allowed 512KiB for SMC-R and 1MiB for SMC-D.
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Default: 64KiB
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smcr_max_links_per_lgr - INTEGER
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Controls the max number of links can be added to a SMC-R link group. Notice that
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the actual number of the links added to a SMC-R link group depends on the number
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of RDMA devices exist in the system. The acceptable value ranges from 1 to 2. Only
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for SMC-R v2.1 and later.
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Default: 2
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smcr_max_conns_per_lgr - INTEGER
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Controls the max number of connections can be added to a SMC-R link group. The
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acceptable value ranges from 16 to 255. Only for SMC-R v2.1 and later.
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Default: 255
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