netdev - Re: BQL support in gianfar causes network hickup

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Date:	Tue, 27 Nov 2012 04:36:56 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Keitel, Tino (ALC NetworX GmbH)" <Tino.Keitel@...networx.de>
Cc:	Tino Keitel <tino.keitel@...ei.de>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: BQL support in gianfar causes network hickup

On Tue, 2012-11-27 at 10:36 +0100, Keitel, Tino (ALC NetworX GmbH)
wrote:
> On Mo, 2012-11-26 at 09:17 -0800, Eric Dumazet wrote:
> > On Mon, 2012-11-26 at 18:08 +0100, Keitel, Tino (ALC NetworX GmbH)
> > wrote:
> > > On Mo, 2012-11-26 at 08:34 -0800, Eric Dumazet wrote:
> > > > On Mon, 2012-11-26 at 11:01 +0100, Tino Keitel wrote:
> > > > > On Sat, Nov 24, 2012 at 15:43:36 -0800, Eric Dumazet wrote:
> > > > > 
> > > > > [...]
> > > > > 
> > > > > > Hmm, I wonder if BQL makes a particular bug showing more often.
> > > > > > 
> > > > > > I see gianfar uses a very small watchdog_timeo of 1 second, while many
> > > > > > drivers use 5 seconds.
> > > > > > 
> > > > > > What happens if you change this to 5 seconds ?
> > > > > 
> > > > > I still got the trace and a failing ptp client.
> > > > > 
> > > > 
> > > > Thanks. Is this bug easy to trigger ?
> > > > 
> > > > I suspect a core issue and a race, likely to happen on your (non x86)
> > > > hardware
> > > > 
> > > > Could you add the following debugging patch ?
> > > 
> > > No visible difference:
> > 
> > OK it seems you trigger the problem fast !
> > 
> > Please try the following as well :
> 
> Hi,
> 
> yes, it can be triggered within 2 minutes.
> 
> The patch makes no difference:

Can you reproduce the problem using a single cpu ?


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