[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] compound skb frag pages appearing in start_xmit
On 19.11.2012 16:43, Sander Eikelenboom wrote: > > Thursday, November 15, 2012, 3:31:42 AM, you wrote: > >> On 2012-10-11 18:14, Ian Campbell wrote: >>> On Thu, 2012-10-11 at 11:05 +0100, Eric Dumazet wrote: >>>> On Thu, 2012-10-11 at 12:00 +0200, Sander Eikelenboom wrote: >>>> >>>>> Probably due to the BUG_ON from the patch below, i changed it into a >>>>> WARN_ON. >>>>> And i seem to hit it, but only in one of the guests at the moment and it >>>>> triggers quite irregularly. >>>> xennet_make_frags() is able to split the skb->head in multiple page-size >>>> chunks. >>>> >>>> It should do the same for fragments >>> Right, I just want to be reproduce the issue so I can know I've fixed it >>> properly ;-) >> Hi Ian, > >> I can reproduce this BUG_ON when running netperf/netserver test between >> two domus running on the same dom0. The domu and dom0 all use v3.7-rc1. > >> When I tried to rebase my persistent grant netfront/netback patch on >> latest kernel, netperf/netserver test never succeeded. I did some test >> to find out that v3.6-rc7 works fine, but v3.7-rc1, v3.7-rc2 and >> v3.7-rc4 does not succeed in netperf/netserver test. So I keep my >> persistent grant patch only based on v3.4-rc3 now. > >> Konrad thought about commit 6a8ed462f16b8455eec5ae00eb6014159a6721f0 in >> v3.7-rc1, and suggested me to test your debug patch in netfront. This >> BUG_ON happens soon after running the netperf/netserver test case. > >> Thanks >> Annie > > Is there any progression with this bug (rc6 is out the door, so the release > of 3.7-final seems to be eminent and this bug completely cripples any > networking with guests) ? > +1 on that. I was testing yesterday with a PVM domU running 3.7-rc5 on Xen 4.2 (but also reported from EC2 running Xen 3.4.3) c with one VCPU. I actually can trigger it by just ssh'ing into the domU (from another machine) and then run "find /". Output starts to stutter and then stops completely. When this happens a new connection still can be made and as long as only shorter output is generated the ssh connection is ok. From a dump taken it looks like user-space is waiting in some select call (without any warnon I rather won't see the tx path). -Stefan Attachment:
signature.asc _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
|
Lists.xenproject.org is hosted with RackSpace, monitoring our |