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| author | Peter Adkins <peter.adkins@kernelpicnic.net> | 2015-03-12 00:15:12 -0700 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2015-03-22 20:20:49 +0100 |
| commit | 09fe692d1b22b47dce6f6a16469f92521dcc3662 (patch) | |
| tree | 442f97c4815f2404bdac048ffe8ada65ebceda62 /man7/tcp.7 | |
| parent | 75295d40e43e1c98f1e3c5a3bcb835deea701e74 (diff) | |
| download | man-pages-09fe692d1b22b47dce6f6a16469f92521dcc3662.tar.gz | |
tcp.7: Document removal of TCP_SYNQ_HSIZE
Looking over the man page for 'tcp' I came across a reference to
tuning the 'TCP_SYNQ_HSIZE' parameter when increasing
'tcp_max_syn_backlog' above 1024. However, this static sizing was
removed back in Linux 2.6.20 in favor of dynamic scaling - as
part of commit 72a3effaf633bcae9034b7e176bdbd78d64a71db.
I have included a patch below with reference to this commit, and
that the process detailed is not required on >= Linux 2.6.20.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Diffstat (limited to 'man7/tcp.7')
| -rw-r--r-- | man7/tcp.7 | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/man7/tcp.7 b/man7/tcp.7 index 5723bde26c..794c636d65 100644 --- a/man7/tcp.7 +++ b/man7/tcp.7 @@ -530,12 +530,16 @@ The default value of 256 is increased to 1024 when the memory present in the system is adequate or greater (>= 128Mb), and reduced to 128 for those systems with very low memory (<= 32Mb). -It is recommended that if this -needs to be increased above 1024, TCP_SYNQ_HSIZE in + +Prior to Linux 2.6.20, +.\" commit 72a3effaf633bcae9034b7e176bdbd78d64a71db +it was recommended that if this needed to be increased above 1024, +the size of the SYNACK hash table (TCP_SYNQ_HSIZE) in .I include/net/tcp.h be modified to keep TCP_SYNQ_HSIZE*16<=tcp_max_syn_backlog, and the kernel be -recompiled. +recompiled. In Linux 2.6.20, the fixed sized TCP_SYNQ_HSIZE was removed +in favour of dynamic sizing. .TP .IR tcp_max_tw_buckets " (integer; default: see below; since Linux 2.4)" .\" Since 2.3.41 |