This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-devel] poor domU VBD performance.

To: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>, "Jens Axboe" <axboe@xxxxxxx>, "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] poor domU VBD performance.
From: Andrew Theurer <habanero@xxxxxxxxxx>
Date: Thu, 31 Mar 2005 14:49:20 -0600
Cc: Xen development list <xen-devel@xxxxxxxxxxxxxxxxxxx>, Vincent Hanquez <tab@xxxxxxxxx>, Philip R Auld <pauld@xxxxxxxxxxx>, Kurt Garloff <garloff@xxxxxxx>, Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>
Delivery-date: Thu, 31 Mar 2005 20:49:25 +0000
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <A95E2296287EAD4EB592B5DEEFCE0E9D1E3975@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <A95E2296287EAD4EB592B5DEEFCE0E9D1E3975@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: KMail/1.5
On Thursday 31 March 2005 11:55, Ian Pratt wrote:
> > > I've checked in something along the lines of what you
> >
> > described into
> >
> > > both the 2.0-testing and the unstable trees. Looks to have
> >
> > identical
> >
> > > performance to the original simple patch, at least for a bulk 'dd'.
> >
> > Can you post the patch here for review? Or just point me
> > somewhere I can view it.
> Jens,
> Thanks for your help on this.

BTW, I am now getting this with xen-unstable:

Process xenblkd (pid: 730, threadinfo=f7cc4000 task=f7c42510)
Stack: c022d172 f44b1a08 f363c6f0 f7cc4000 c046d40c c02849f8 f44b1a08 00000010
       00000000 f7c42510 c0115b0a 00000000 00000000 f7c42510 c17f1e48 c01092e6
       00000000 f7c42510 c0115b0a 00100100 00200200 00000000 00000000 00000000
Call Trace:
 [<c022d172>] blk_run_queue+0x38/0x91
 [<c02849f8>] blkio_schedule+0x126/0x149
 [<c0115b0a>] default_wake_function+0x0/0x12
 [<c01092e6>] ret_from_fork+0x6/0x1c
 [<c0115b0a>] default_wake_function+0x0/0x12
 [<c02848d2>] blkio_schedule+0x0/0x149
 [<c0107571>] kernel_thread_helper+0x5/0xb
Code:  Bad EIP value.
 <6>note: xenblkd[730] exited with preempt_count 1

Xen-devel mailing list