From mboxrd@z Thu Jan 1 00:00:00 1970 From: chris@versecorp.net Subject: Re: Hangs Date: Tue, 2 Dec 2008 17:20:09 -0800 Message-ID: <20081203012009.GA12115@versecorp.net> References: <200811192243.mAJMhgFU005350@versecorp.net> <20081120171057.GA13638@versecorp.net> <20081121193237.GA22203@dmt.cnet> <20081122175434.GA11849@versecorp.net> <519a8b110811280305v764fade1w9d02f5c9188f56e5@mail.gmail.com> <519a8b110811280435rd6175bfne596e46d80c0341a@mail.gmail.com> <519a8b110812020247j6716933x7230d33c9ce0efd1@mail.gmail.com> <49352583.10208@redhat.com> <20081202205832.GA16265@versecorp.net> <519a8b110812021501s4fa13fd7y569eae8e08b4271b@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: kvm@vger.kernel.org To: xming Return-path: Received: from www.versecorp.net ([74.208.43.213]:53167 "EHLO versecorp.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751914AbYLCBUM (ORCPT ); Tue, 2 Dec 2008 20:20:12 -0500 Content-Disposition: inline In-Reply-To: <519a8b110812021501s4fa13fd7y569eae8e08b4271b@mail.gmail.com> Sender: kvm-owner@vger.kernel.org List-ID: Sounds like your configuration is very similar to mine. I'm also on a vanilla kernel (2.6.27.7 in my case) with kvm-79 and AMD processors. You sparked my curiosity on the depmod -a issue, so I spent some time trying it on different configurations. I have two servers: * 1.8GHz AMD Opteron 2210 on an HP DL385G2, AMD Opteron 2210 * 2.5GHz AMD Athlon 4850e on a "green" build w/ a Gigabyte GA-MA74Gm-S2 I can reproduce it on the Gigagbyte build with ease. On the HP DL385G2 server, I could reproduce it on one of my guests but only once in every four times (and with multiple guests running, not sure if that made a difference). Like you, I also have had the feeling that my occassional hangs were more likely on a freshly reboot, but don't have anything real conclusive to prove it. I'm afraid I don't have an Intel-based server around right now to see if this is an AMD-only issue. I might be able to scrounge up an HP DL380G5 (with an Intel Core 2) but I'm not sure. Chris On Wed, Dec 03, 2008 at 12:01:32AM +0100, xming wrote: > > I have a way to reproduce my instance of the problem easily now. I was trying > > to build a new kernel on my guest, and found that depmod hangs guests every > > time. > > In my case, I only have an amd processor - I don't have an intel > > host to try it on, right now, but it happens on Ubuntu 8.04 > > and Ubuntu 8.10 guests, both using kvm-79 and the version of kvm that ships > > with ubuntu 8.10. > > I have AMD too, vanilla kernel 2.6.27.6 and kvm-79 (although I have > this before 79). > the guest is SMP (UP guests hang too but less frequent). > > depmod does not hang here (not reproducible). Heavy CPU + heavy IO on nfs mounts > triggers this on my side. > > I have a very subjective feeling that it happens more frequently when > the host has > less uptime (freshly rebooted). > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html