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List:       linux-newbie
Subject:    Re: Any issue to be considered if ethernet send buffer is modified
From:       Sebastian Andrzej Siewior <bigeasy () linutronix ! de>
Date:       2013-10-11 9:51:23
Message-ID: 20131011095123.GB6983 () linutronix ! de
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* Ashoka K | 2013-08-30 13:51:14 [+0530]:

>Hi,
Hi,

>I use embedded system with 2.6.33, Preempt patch. To reduce the
>latency of sending data by our application, the ethernet send buffer
>is modified with setsockopt().
>
>Before modification the send buffer size by default was shown as 16384 bytes.
>But on proc system value shown is different, both default and max are same:
>/proc/sys/net/core/wmem_default = 108544
>
>Eventhough the above value is not modified, why the default is shown
>as 16384 instead 108544. Did kernel change these values during sending
>traffic ?
>
>If send buffer is set by setsockopt(), is this value modified by
>kernel during run time?

Try to grep for sysctl_wmem_default. Atleast on v3.10 this value is
initialized at compile time and only updated via sysctl and not by the
kernel.

>AK

Sebastian
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