62 lines
1.9 KiB
ReStructuredText
62 lines
1.9 KiB
ReStructuredText
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.. 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 default value inherits from net.ipv4.tcp_wmem[1].
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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: 16K
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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 default value inherits from net.ipv4.tcp_rmem[1].
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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: 128K
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