netdev - Re: BUG - qdev - partial loss of network connectivity

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Message-ID: <20100928095058.GI12472@redhat.com>
Date:	Tue, 28 Sep 2010 11:50:58 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Leszek Urbanski <tygrys@....pl>
Cc:	Anthony Liguori <anthony@...emonkey.ws>, qemu-devel@...gnu.org,
	netdev@...r.kernel.org, linux-nfs@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: BUG - qdev - partial loss of network connectivity

On Mon, Sep 27, 2010 at 11:32:03PM +0200, Leszek Urbanski wrote:
> <20100926154324.GD21843@...hat.com>; from Michael S. Tsirkin on Sun, Sep 26, 2010 at 17:43:24 +0200
> 
> > > > >It's vanilla 2.6.32.22, but I also reproduced this on Debian's 2.6.32-23
> > > > >(based on 2.6.32.21).
> > > > >
> > > > >If offload is the only difference, I'll play with different offload
> > > > >options and check which one causes it.
> > > > >   
> > > > 
> > > > It's not technically the only difference but it's the most likely 
> > > > culprit IMHO.
> > > 
> > > udp fragmentation offload is definitely the culprit.
> > 
> > I see. Most likely guest bug - won't be the first bug around UFO.
> > If so pls copy netdev linux-nfs and virtualization.
> > Do you see anything in dmesg? Can try 2.6.36-rc5?
> 
> (for reference: first post is at:
> http://lists.nongnu.org/archive/html/qemu-devel/2010-09/msg01685.html )
> 
> I can't reproduce it on 2.6.36-rc5. Do you have an idea which patch may have
> fixed it, or should I dissect?

bisect, yes: there were many UFO related patches since 2.6.32.

-- 
MST
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