netdev - Re: sch_generic warn

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Message-ID: <1310419204.2860.11.camel@edumazet-laptop>
Date:	Mon, 11 Jul 2011 23:20:04 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	davej@...hat.com, netdev@...r.kernel.org
Subject: Re: sch_generic warn_on (timed out)

Le lundi 11 juillet 2011 à 14:17 -0700, David Miller a écrit :
> From: Dave Jones <davej@...hat.com>
> Date: Mon, 11 Jul 2011 16:48:34 -0400
> 
> > We've recieved quite a few bug reports in Fedora recently concerning this warning in
> > sch_generic..
> > 
> >             WARN_ONCE(1, KERN_INFO "NETDEV WATCHDOG: %s (%s): transmit queue %u timed out\n",
> >                       dev->name, netdev_drivername(dev, drivername, 64), i);
> > 
> > https://bugzilla.redhat.com/show_bug.cgi?id=702723 is our 'master bug' that we're
> > duping all others against. It seems to be showing up on a variety of different
> > hardware (r8169, atl1c, ipheth, e1000e, 8139too). Do all these drivers need
> > fixing ? or is it just 'crap hardware' ?
> > 
> > note that I've only been looking through fedora 15 bugs so far (which is still on 2.6.38),
> > but looking at the commit log for sch_generic, it doesn't seem that there's anything
> > obvious that needs backporting.
> 
> It means the transmitter stopped sending packets for several seconds.
> 
> I would track this on a per-device basis if I were you, instead of
> combining them all into one super-bug.

Last time I took a look (on one r8169 NIC), it wasnt clear if this could
be a PAUSE problem.


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