From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753092Ab1HHBfV (ORCPT ); Sun, 7 Aug 2011 21:35:21 -0400 Received: from mail-pz0-f42.google.com ([209.85.210.42]:62866 "EHLO mail-pz0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751628Ab1HHBfS (ORCPT ); Sun, 7 Aug 2011 21:35:18 -0400 Message-ID: <4E3F3D4E.70104@gmail.com> Date: Mon, 08 Aug 2011 09:35:10 +0800 From: Liu Yuan User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.18) Gecko/20110617 Thunderbird/3.1.11 MIME-Version: 1.0 To: Badari Pulavarty 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> In-Reply-To: <4E3C302A.3040500@us.ibm.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 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