From mboxrd@z Thu Jan 1 00:00:00 1970 From: ANNIE LI Subject: Re: [Xen-devel] compound skb frag pages appearing in start_xmit Date: Thu, 15 Nov 2012 10:31:42 +0800 Message-ID: <50A4540E.1010601@oracle.com> References: <1349790467.21847.185.camel@zakaz.uk.xensource.com> <1349790863.21172.4406.camel@edumazet-glaptop> <1349792241.21847.199.camel@zakaz.uk.xensource.com> <1349792847.21172.4479.camel@edumazet-glaptop> <1349793630.21847.208.camel@zakaz.uk.xensource.com> <1349863984.10070.26.camel@zakaz.uk.xensource.com> <1349874598.10070.39.camel@zakaz.uk.xensource.com> <748966751.20121010164949@eikelenboom.it> <1349942546.14806.7.camel@zakaz.uk.xensource.com> <151954917.20121011120004@eikelenboom.it> <1349949924.21172.8462.camel@edumazet-glaptop> <1349950494.14806.29.camel@zakaz.uk.xensource.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Eric Dumazet , Sander Eikelenboom , Eric Dumazet , "netdev@vger.kernel.org" , Konrad Rzeszutek Wilk , xen-devel , "Marcos E. Matsunaga" To: Ian Campbell Return-path: Received: from aserp1040.oracle.com ([141.146.126.69]:29756 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1423500Ab2KOCb7 (ORCPT ); Wed, 14 Nov 2012 21:31:59 -0500 In-Reply-To: <1349950494.14806.29.camel@zakaz.uk.xensource.com> Sender: netdev-owner@vger.kernel.org List-ID: 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