netdev - Re: Re: Re: Re: Re: Re: limited network bandwidth with 3.2.x kernels

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Message-ID: <CADVnQykxiGBXCKdr=G+T190EA14RnAs0HJ69imsN0h8JKMS4jw@mail.gmail.com>
Date:	Wed, 15 Feb 2012 01:03:46 -0500
From:	Neal Cardwell <ncardwell@...gle.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	alekcejk@...glemail.com, netdev@...r.kernel.org
Subject: Re: Re: Re: Re: Re: Re: limited network bandwidth with 3.2.x kernels

There are some potentially interesting differences in sysctl values:

> diff -u /tmp/sysctl-a-3.1.txt /tmp/sysctl-a-3.2.txt  | grep mem_def
-net.core.wmem_default = 114688
-net.core.rmem_default = 114688
+net.core.wmem_default = 163840
+net.core.rmem_default = 163840

Can you please try running this as root on the 3.2 kernel and then see
what sort of performance you get:

sysctl net.core.rmem_default=114688

This should make the 3.2 config closer to the 3.1 config. Should be
interesting to see if the behavior is more similar when that happens.

neal
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