From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: Re: tcpdump locks up kvm host for a while. Date: Mon, 10 Oct 2011 15:08:46 +0200 Message-ID: <4E92EE5E.5050707@redhat.com> References: <20111002173745.GG30948@stodi.digitalkingdom.org> <20111003030303.GH30948@stodi.digitalkingdom.org> <4E8B4D30.9030304@redhat.com> <20111004194033.GL30164@stodi.digitalkingdom.org> <4E8CA041.1090709@redhat.com> <20111005183653.GF3023@stodi.digitalkingdom.org> <20111005202918.GL3023@stodi.digitalkingdom.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org To: Robin Lee Powell Return-path: Received: from mx1.redhat.com ([209.132.183.28]:29861 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753031Ab1JJNI5 (ORCPT ); Mon, 10 Oct 2011 09:08:57 -0400 In-Reply-To: <20111005202918.GL3023@stodi.digitalkingdom.org> Sender: kvm-owner@vger.kernel.org List-ID: On 10/05/2011 10:29 PM, Robin Lee Powell wrote: > > > > # > > # (For a higher level overview, try: perf report --sort comm,dso) > > # > > > > How helpful is that? -_- > > > > I'm guessing I need --guestkallsyms= ; since they're all the same > > kernel I thought it'd figure it out. I'll redo. > > OK, here's a "better" version. > > # Events: 46K cycles > # > # Overhead Command Shared Object Symbol > # ........ ........ ....................... ....................... > # > 74.81% qemu-kvm [unknown] [u] 0x7fbdffd4c18a This is in userspace, so it seems the guest wasn't completely stuck. Try 'top -b' inside the guest to record what happens, let's see what processes this is and go from there. > 25.14% qemu-kvm [guest.kernel.kallsyms] [g] 0xffffffff811112f0 This doesn't resolve, please make sure the kernel-debuginfo package is installed in the guest and use the guestmount option. (or you can install it in the host, I think) -- error compiling committee.c: too many arguments to function