From mboxrd@z Thu Jan 1 00:00:00 1970 From: Felix Leimbach Subject: Re: strange guest slowness after some time Date: Tue, 17 Mar 2009 18:05:19 +0100 Message-ID: <49BFD84F.8050509@gmx.net> 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> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: Avi Kivity , kvm@vger.kernel.org To: Tomasz Chmielewski Return-path: Received: from mail.gmx.net ([213.165.64.20]:35293 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1755777AbZCQRF1 (ORCPT ); Tue, 17 Mar 2009 13:05:27 -0400 In-Reply-To: <49BFCC04.9080402@wpkg.org> Sender: kvm-owner@vger.kernel.org List-ID: 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) >> (output of ifconfig, even on an unaffected e1000 guest, might help) currently I have e1000 only on windows guests. Is there a way to gather relevant statistics there too?