Re: [Xen-devel] Frag is bigger than frame.

[Steven Haigh <netwiz@xxxxxxxxx>]

On 26/04/2013 1:36 AM, Wei Liu wrote:
> On Thu, Apr 25, 2013 at 4:11 PM, Wei Liu <wei.liu2@xxxxxxxxxx> wrote:
> > On Thu, Apr 25, 2013 at 12:24:22PM +0100, Steven Haigh wrote:
> > > Hi all,
> > >
> > > I've noticed a couple of DomUs have networking freeze with the following
> > > getting printed to the Dom0's /var/log/messages:
> > >
> > > Apr 25 12:09:25 hosting kernel: vif vif-4-0 vif.crc: Frag is bigger than
> > > frame.
> > > Apr 25 12:09:25 hosting kernel: vif vif-4-0 vif.crc: fatal error;
> > > disabling device
> > > Apr 25 12:09:25 hosting kernel: br0: port 5(vif.crc) entered disabled state
> > >
> > > I thought this was something to do with MAX_SKB_FRAGS - however the
> > > kernel I use has this increased to 19 - so in theory I shouldn't hit
> > > this (as far as I know).
> > >
> > > Are there any other things that could trigger this?
> > You're seeing a netfront bug which is fixed in that series. And it is
> > not related to MAX_SKB_FRAGS but related to GSO.
> >
> > Could you try applying my patch set "Bundle fixes for Xen netfront /
> > netback" version 7. That series has been applied to DaveM's net-next.
> BTW with that series you should be able to get rid of the
> MAX_SKB_FRAGS -> 19 hack.
This could be quite difficult. The DomU kernel is RHEL based - and not 
easily changed without sending the patch upstream to RH - which may or 
may not apply it.
My google-fu has failed a little here - do you have a link to the 
patches? Is it against Xen or the kernel? Further, is it something that 
just altering the Dom0 part would resolve?
--
Steven Haigh

Email: netwiz@xxxxxxxxx
Web: https://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897
Fax: (03) 8338 0299

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