From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: strange guest slowness after some time Date: Tue, 17 Mar 2009 19:10:49 +0200 Message-ID: <49BFD999.503@redhat.com> 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> <49BFCC04.9080402@wpkg.org> <49BFD84F.8050509@gmx.net> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: Tomasz Chmielewski , kvm@vger.kernel.org To: Felix Leimbach Return-path: Received: from mx1.redhat.com ([66.187.233.31]:45218 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754670AbZCQRKx (ORCPT ); Tue, 17 Mar 2009 13:10:53 -0400 In-Reply-To: <49BFD84F.8050509@gmx.net> Sender: kvm-owner@vger.kernel.org List-ID: Felix Leimbach wrote: > Tomasz Chmielewski wrote: >> Avi Kivity schrieb: >>> 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. > I had overflows on the counters as well (32 bit guests) without an > problem. > Here is the current ifconfig output of a machine which suffered the > problem before: > > eth0 Link encap:Ethernet HWaddr 52:54:00:74:01:01 > inet addr:10.75.13.1 Bcast:10.75.255.255 Mask:255.255.0.0 > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > RX packets:3542104 errors:0 dropped:0 overruns:0 frame:0 > TX packets:412546 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:1000 > RX bytes:682285568 (650.6 MiB) TX bytes:2907586796 (2.7 GiB) packet counters are will within 32-bit limits. byte counters not so interesting. > currently I have e1000 only on windows guests. Is there a way to > gather relevant statistics there too? Sure, right-click on the adapter icon, it's there somewhere. Do you experience the slowdown on Windows guests? -- error compiling committee.c: too many arguments to function