linux-kernel - Re: many rx packets dropped since 2.6.37

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Message-ID: <CAOFJUkj27aF6diDjcZFTyBaTdDdU8URkj+1vr3ECoozbzqDVBg@mail.gmail.com>
Date:	Wed, 25 Apr 2012 14:34:45 +0200
From:	Chris <xchris89x@...glemail.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: many rx packets dropped since 2.6.37

2012/4/25 Eric Dumazet <eric.dumazet@...il.com>:
> On Wed, 2012-04-25 at 13:03 +0200, Chris wrote:
>> Hello,
>>
>> There is a bug since 2.6.37 with dropped rx packets in virtual
>> environments (like kvm) and bonded network interfaces.
>>
>> References:
>> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/890475
>> https://bugzilla.redhat.com/show_bug.cgi?id=709551
>>
>> This change has led to:
>> commit caf586e5f23cebb2a68cbaf288d59dbbf2d74052
>> Author: Eric Dumazet <eric.dumazet@...il.com>
>> Date:   Thu Sep 30 21:06:55 2010 +0000
>>
>> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=caf586e5f23cebb2a68cbaf288d59dbbf2d74052
>> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=8990f468a
>>
>> Would it be possible to remove this patch?
>>
>> --
>> Chris
>
> Its no possible to remove this patch.
>
> If you want to ignore fact that packets _are_ dropped, just ignore the
> counter.
>
> We want to track dropped packets, not hide them.

Are you sure that these packets are really dropped? I see a lot of
more packets dropped with virtio_net instead of e1000. (KVM
environments)

Why do we see dropped packets only in virtual environments and bonded
network interfaces and not on real network interfaces?

--
Chris
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