From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751463Ab1HHFGl (ORCPT ); Mon, 8 Aug 2011 01:06:41 -0400 Received: from e3.ny.us.ibm.com ([32.97.182.143]:36946 "EHLO e3.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750947Ab1HHFGh (ORCPT ); Mon, 8 Aug 2011 01:06:37 -0400 Message-ID: <4E3F6E72.1000907@us.ibm.com> Date: Sun, 07 Aug 2011 22:04:50 -0700 From: Badari Pulavarty User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.16) Gecko/20101125 Thunderbird/3.0.11 MIME-Version: 1.0 To: Liu Yuan CC: Stefan Hajnoczi , "Michael S. Tsirkin" , Rusty Russell , Avi Kivity , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Khoa Huynh Subject: Re: [RFC PATCH]vhost-blk: In-kernel accelerator for virtio block device References: <1311863346-4338-1-git-send-email-namei.unix@gmail.com> <4E325F98.5090308@gmail.com> <4E32F7F2.4080607@us.ibm.com> <4E363DB9.70801@gmail.com> <1312495132.9603.4.camel@badari-desktop> <4E3BCE4D.7090809@gmail.com> <4E3C302A.3040500@us.ibm.com> <4E3F3D4E.70104@gmail.com> In-Reply-To: <4E3F3D4E.70104@gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 8/7/2011 6:35 PM, Liu Yuan wrote: > On 08/06/2011 02:02 AM, Badari Pulavarty wrote: >> On 8/5/2011 4:04 AM, Liu Yuan wrote: >>> On 08/05/2011 05:58 AM, Badari Pulavarty wrote: >>>> Hi Liu Yuan, >>>> >>>> I started testing your patches. I applied your kernel patch to 3.0 >>>> and applied QEMU to latest git. >>>> >>>> I passed 6 blockdevices from the host to guest (4 vcpu, 4GB RAM). >>>> I ran simple "dd" read tests from the guest on all block devices >>>> (with various blocksizes, iflag=direct). >>>> >>>> Unfortunately, system doesn't stay up. I immediately get into >>>> panic on the host. I didn't get time to debug the problem. Wondering >>>> if you have seen this issue before and/or you have new patchset >>>> to try ? >>>> >>>> Let me know. >>>> >>>> Thanks, >>>> Badari >>>> >>> >>> Okay, it is actually a bug pointed out by MST on the other thread, >>> that it needs a mutex for completion thread. >>> >>> Now would you please this attachment?This patch only applies to >>> kernel part, on top of v1 kernel patch. >>> >>> This patch mainly moves completion thread into vhost thread as a >>> function. As a result, both requests submitting and completion >>> signalling is in the same thread. >>> >>> Yuan >> >> Unfortunately, "dd" tests (4 out of 6) in the guest hung. I see >> following messages >> >> virtio_blk virtio2: requests: id 0 is not a head ! >> virtio_blk virtio3: requests: id 1 is not a head ! >> virtio_blk virtio5: requests: id 1 is not a head ! >> virtio_blk virtio1: requests: id 1 is not a head ! >> >> I still see host panics. I will collect the host panic and see if its >> still same or not. >> >> Thanks, >> Badari >> >> > Would you please show me how to reproduce it step by step? I tried dd > with two block device attached, but didn't get hung nor panic. > > Yuan I did 6 "dd"s on 6 block devices.. dd if=/dev/vdb of=/dev/null bs=1M iflag=direct & dd if=/dev/vdc of=/dev/null bs=1M iflag=direct & dd if=/dev/vdd of=/dev/null bs=1M iflag=direct & dd if=/dev/vde of=/dev/null bs=1M iflag=direct & dd if=/dev/vdf of=/dev/null bs=1M iflag=direct & dd if=/dev/vdg of=/dev/null bs=1M iflag=direct & I can reproduce the problem with in 3 minutes :( Thanks, Badari