From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:53963) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UPutF-0004ht-Th for qemu-devel@nongnu.org; Wed, 10 Apr 2013 09:16:48 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UPutA-0002J9-DD for qemu-devel@nongnu.org; Wed, 10 Apr 2013 09:16:41 -0400 Received: from e9.ny.us.ibm.com ([32.97.182.139]:56771) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UPutA-0002J0-8S for qemu-devel@nongnu.org; Wed, 10 Apr 2013 09:16:36 -0400 Received: from /spool/local by e9.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 10 Apr 2013 09:16:35 -0400 Received: from d01relay05.pok.ibm.com (d01relay05.pok.ibm.com [9.56.227.237]) by d01dlp01.pok.ibm.com (Postfix) with ESMTP id E7ED638C801A for ; Wed, 10 Apr 2013 09:16:31 -0400 (EDT) Received: from d03av01.boulder.ibm.com (d03av01.boulder.ibm.com [9.17.195.167]) by d01relay05.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r3ADGV5V328684 for ; Wed, 10 Apr 2013 09:16:31 -0400 Received: from d03av01.boulder.ibm.com (loopback [127.0.0.1]) by d03av01.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r3ADGEqC001408 for ; Wed, 10 Apr 2013 07:16:15 -0600 Message-ID: <5165661D.1060700@linux.vnet.ibm.com> Date: Wed, 10 Apr 2013 09:16:13 -0400 From: "Michael R. Hines" MIME-Version: 1.0 References: <51645345.60005@linux.vnet.ibm.com> <51651817.1050703@redhat.com> <51655E7D.2000308@linux.vnet.ibm.com> <51655F3A.3070703@redhat.com> In-Reply-To: <51655F3A.3070703@redhat.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] latest master: major slowdown (something spinning?) List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paolo Bonzini Cc: "qemu-devel@nongnu.org" Will do, in the meantime, QEMU just printed out this error message: main-loop: WARNING: I/O thread spun for 1000 iterations Will get the traces later for you.... - Michael On 04/10/2013 08:46 AM, Paolo Bonzini wrote: > Il 10/04/2013 14:43, Michael R. Hines ha scritto: >> Yes, it still happens at that commit string. >> >> Is there a specific test or trace I can provide to help track it down? > You can try: > > 1) first, please post the exact QEMU command line your using; > > 2) put "strace -e poll" in front and post the final lines. Also post > the output of "ls -l /proc//fd" where is QEMU's pid. > > 3) if the output of "strace -e poll" hangs, instead, run it under gdb > and post a backtrace. Perhaps continue the process a few times and > check if the backtrace remains the same or changes. > > Paolo >