From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomasz Chmielewski Subject: Re: strange guest slowness after some time Date: Tue, 26 May 2009 16:07:44 +0200 Message-ID: <4A1BF7B0.70107@wpkg.org> References: <49B29705.6000904@wpkg.org> <49D30801.5020201@wpkg.org> <49DA1D75.6000604@wpkg.org> <200904081019.14768.rusty@rustcorp.com.au> <4A1BD765.4080405@wpkg.org> <4A1BD8A7.9090404@redhat.com> <4A1BDB10.2030603@wpkg.org> <4A1BDC1F.5050708@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: Rusty Russell , "David S. Ahern" , Felix Leimbach , kvm@vger.kernel.org, Anthony Liguori To: Avi Kivity Return-path: Received: from mx03.syneticon.net ([78.111.66.105]:55987 "EHLO mx03.syneticon.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751783AbZEZOHa (ORCPT ); Tue, 26 May 2009 10:07:30 -0400 In-Reply-To: <4A1BDC1F.5050708@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: Avi Kivity wrote: > Tomasz Chmielewski wrote: >> Avi Kivity wrote: >>> Tomasz Chmielewski wrote: >>>> >>>> I still observe this "slowness" with kvm-86 after the guest is >>>> running for some time (virtio_net and virtio_console seem to be >>>> affected; guest restart doesn't fix it). >>>> >>> >>> Anything in guest dmesg? >> >> No. >> No hints in syslog, dmesg... >> >> >> Can it be that this is more likely to happens on "busy" hosts? >> > > We'll only know once we fix it... (...) > Maybe virtio is racy and a loaded host exposes the race. I see it happening with virtio on 2.6.29.x guests as well. So, what would you do if you saw it on your systems as well? ;) Add some debug routines into virtio_* modules? -- Tomasz Chmielewski http://wpkg.org