From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomasz Chmielewski Subject: Re: strange guest slowness after some time Date: Tue, 17 Mar 2009 17:12:52 +0100 Message-ID: <49BFCC04.9080402@wpkg.org> References: <49B29705.6000904@wpkg.org> <49B4E7A6.3090601@redhat.com> <49B4EDC9.9020504@wpkg.org> <49B4EE8F.7050001@redhat.com> <49BD007C.9030809@wpkg.org> <49BF7FB6.9080503@wpkg.org> <49BF8686.5050707@redhat.com> <49BF88BE.7040805@wpkg.org> <49BFC276.1080600@gmx.net> <49BFC743.20000@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: Felix Leimbach , kvm@vger.kernel.org To: Avi Kivity Return-path: Received: from mx03.syneticon.net ([78.111.66.105]:38154 "EHLO mx03.syneticon.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754639AbZCQQM5 (ORCPT ); Tue, 17 Mar 2009 12:12:57 -0400 In-Reply-To: <49BFC743.20000@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: Avi Kivity schrieb: > Felix Leimbach wrote: >> I see similar behavior: After a week one of my guests' network totally >> stops to respond. Only guests using virtio networking get hit. Both >> windows and linux guests are affected. >> My guests in production use e1000 and have never been hit. >> While that can be a coincidence it seems very unlikely: Out of 3 >> virtio guests 2 have been hit, one repeatedly. >> Out of 3 e1000 guests none has ever been hit. >> >> Observed with kvm-83 and kvm-84 with the host running in-kernel KVM >> code (linux 2.6.25.7) > > Might it be that some counter overflowed? What are the packet counts on > long running guests? I don't think so. I just made both counters (TX, RX) of ifconfig for virtio interfaces overflow several times and everything is still as fast as it should be. > (output of ifconfig, even on an unaffected e1000 guest, might help) -- Tomasz Chmielewski http://wpkg.org