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> > Ian. > > > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xen.org > http://lists.xen.org/xen-devel