netdev - Re: r8169 regression: UDP packets dropped intermittantly

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Date:	Tue, 12 Mar 2013 08:48:39 +1030
From:	Jonathan Woithe <jwoithe@...ad.com.au>
To:	Francois Romieu <romieu@...eil.com>
Cc:	netdev@...r.kernel.org, Jonathan Woithe <jwoithe@...ad.com.au>
Subject: Re: r8169 regression: UDP packets dropped intermittantly

This is following up on my response from a few days ago.

On Mon, Mar 11, 2013 at 01:02:16AM +0100, Francois Romieu wrote:
> Jonathan Woithe <jwoithe@...ad.com.au> :
> [...]
> > While we can rely on the retry system to paper over this regression, the
> > behaviour of earlier kernels suggests that there is a real issue at play. 
> > Is there any chance that this can be looked at ?
> :
> Take it for what it's worth but I don't test much with PREEMPT, NOHZ or
> SLUB and I never tried all those at the same time.

I have now run tests to address this comment.  Starting with the kernel
config I originally posted:

 * turn off CONFIG_NO_HZ: problem still present.

 * then turn off PREEMPT settings: problem still present.

 * then change from SLUB to SLAB allocator: problem still present.

In conclusion, the problem still shows when the kernel is configured to use
SLAB without PREEMPT and NOHZ.

Regards
  jonathan

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