* net.ipv4.tcp_rmem does override net.core.rmem_max?
@ 2016-02-16 17:04 Niklas Hambüchen
[not found] ` <56C35692.7010807-7wQd5C9ZzNw@public.gmane.org>
0 siblings, 1 reply; 3+ messages in thread
From: Niklas Hambüchen @ 2016-02-16 17:04 UTC (permalink / raw)
To: mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w; +Cc: linux-man-u79uwXL29TY76Z2rM5mHXA
`man tcp` says `net.ipv4.tcp_rmem`'s max value *does not override*
`net.core.rmem_max` (see [1] [2]) but I found in practice it does.
The person in this thread
http://stackoverflow.com/questions/31546835/tcp-receiving-window-size-higher-than-net-core-rmem-max/35438236
confirms my finding.
Is the man page (and ip-sysctl.txt) outdated?
Thanks for clarifying!
Niklas
[1]
https://github.com/mkerrisk/man-pages/blob/af54e3b7163998cbe1f487f4dca040615fbf949b/man7/tcp.7#L745
[2]
https://github.com/torvalds/linux/blob/34229b277480f46c1e9a19f027f30b074512e68b/Documentation/networking/ip-sysctl.txt#L512
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* Re: net.ipv4.tcp_rmem does override net.core.rmem_max?
[not found] ` <56C35692.7010807-7wQd5C9ZzNw@public.gmane.org>
@ 2016-02-16 17:05 ` Niklas Hambüchen
[not found] ` <56C356E5.8010004-7wQd5C9ZzNw@public.gmane.org>
0 siblings, 1 reply; 3+ messages in thread
From: Niklas Hambüchen @ 2016-02-16 17:05 UTC (permalink / raw)
To: mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w; +Cc: linux-man-u79uwXL29TY76Z2rM5mHXA
An answer to the question I just posted,
http://stackoverflow.com/a/35438236/263061
suggests that neither is the case, but in fact the kernel takes the
maximum of the two values.
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* Re: net.ipv4.tcp_rmem does override net.core.rmem_max?
[not found] ` <56C356E5.8010004-7wQd5C9ZzNw@public.gmane.org>
@ 2016-02-16 18:20 ` Niklas Hambüchen
0 siblings, 0 replies; 3+ messages in thread
From: Niklas Hambüchen @ 2016-02-16 18:20 UTC (permalink / raw)
To: mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w; +Cc: linux-man-u79uwXL29TY76Z2rM5mHXA
Or, there is the following interpretation:
"This value does not override the global
net.core.rmem_max."
might mean
"This value does not override the global
net.core.rmem_max to the extent that it does
not define the upper users can set with SO_RCVBUF.
It does, however, override net.core.rmem_max if
SO_RCVBUF is not used."
This would be consistent with my findings.
I'm not 100% confident about whether this is what the code does though,
see my comment
http://stackoverflow.com/questions/31546835/tcp-receiving-window-size-higher-than-net-core-rmem-max/35438236#comment58576526_35438236
for details on that.
On 16/02/16 18:05, Niklas Hambüchen wrote:
> An answer to the question I just posted,
>
> http://stackoverflow.com/a/35438236/263061
>
> suggests that neither is the case, but in fact the kernel takes the
> maximum of the two values.
>
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end of thread, other threads:[~2016-02-16 18:20 UTC | newest]
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2016-02-16 17:04 net.ipv4.tcp_rmem does override net.core.rmem_max? Niklas Hambüchen
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2016-02-16 17:05 ` Niklas Hambüchen
[not found] ` <56C356E5.8010004-7wQd5C9ZzNw@public.gmane.org>
2016-02-16 18:20 ` Niklas Hambüchen
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