From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steven Haigh Subject: Re: Frag is bigger than frame. Date: Fri, 26 Apr 2013 14:21:06 +1000 Message-ID: <517A00B2.2010403@crc.id.au> References: <51791266.20308@crc.id.au> <20130425151114.GK7466@zion.uk.xensource.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Wei Liu Cc: Wei Liu , xen-devel List-Id: xen-devel@lists.xenproject.org On 26/04/2013 1:36 AM, Wei Liu wrote: > On Thu, Apr 25, 2013 at 4:11 PM, Wei Liu 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@crc.id.au Web: https://www.crc.id.au Phone: (03) 9001 6090 - 0412 935 897 Fax: (03) 8338 0299