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

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Date:	Tue, 21 Feb 2012 06:21:08 +0200
From:	alekcejk@...glemail.com
To:	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org
Subject: Re: Re: limited network bandwidth with 3.2.x kernels

> > I noticed that with 3.2.x kernels download speed from some internet resources
> > became about half of speed that was with previous kernels (3.1 and older).
> > I tested Fedora 15 kernels 2.6.41.10 = 3.1.10 and 2.6.42.3 = 3.2.3
> > (many times rebooted for testing with first and second kernels).
> > See bug https://bugzilla.redhat.com/show_bug.cgi?id=789659

Hi,

I tested last released 3.2.7 kernel (2.6.42.7-1.fc15.i686).
Speed problems in 3.2.7 the same as in 3.2.6.

I also have Fedora Rawhide installed in virtual machine (e1000 driver used there)
running on host with 3.1.10 kernel.
And I noticed that after one of 3.3 rc's (or even rc's of 3.2) kernel updates download speed of
updates from dl.fedoraproject.org in VM became extremely slow - about 160 kilobytes/sec
instead of 1,2 megabytes/sec as it was before.
But recently (somewhere between 3.3 rc3 and rc4) speed became again
as it should 1,2 MB/s.

Don't know is this problem related with speed in 3.2.x kernels
and it is hard to debug this now.

-- 
Alexey Kurov <nucleo@...oraproject.org>
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