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] Re: [b.g.o.358549] blkfront: Move blkif_interrupt into a

To: Marcin Mirosław <marcin@xxxxxxxx>
Subject: Re: [Xen-devel] Re: [b.g.o.358549] blkfront: Move blkif_interrupt into a tasklet.
From: Daniel Stodden <daniel.stodden@xxxxxxxxxx>
Date: Thu, 5 May 2011 16:03:13 -0700
Cc: "kernel@xxxxxxxxxx" <kernel@xxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Delivery-date: Thu, 05 May 2011 16:04:07 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <4DC32B53.8010903@xxxxxxxx>
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/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <4DC15DC8.2010302@xxxxxxxx> <20110505212245.GA14953@xxxxxxxxxxxx> <4DC32B53.8010903@xxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
On Thu, 2011-05-05 at 18:57 -0400, Marcin Mirosław wrote:
> W dniu 2011-05-05 23:22, Konrad Rzeszutek Wilk pisze:
> > On Wed, May 04, 2011 at 04:08:08PM +0200, Marcin Mirosław wrote:
> >> Hello!
> >> I'm hitted by issue described there:
> >> http://lists.xensource.com/archives/html/xen-devel/2010-09/msg00164.html
> >> . I'm using 32bit guest (no SMP) on 64 xen-server. On hardened-kernel
> >> (grsec)-2.6.{35,36} there is silence in dmesg (i don't remember what was
> >> going on on earlier kernels). On hardened-kernel-2.6.{37,38} and on
> >> vanilla-kernel-2.6.{37,38,39} and git-sources-2.6.39_rc5-r7 problem exists.
> > 
> > Do you always get this when you try to mount a filesystem with
> > barriers? And do you see this _only_ with 32-bit guests, but not with 
> > 64-bit ones?
> I'm not admin of Dom0, i've got only one vm (with PV enabled), which is
> 32 bit. I didn't try to start them with 64 bit kernel (and 32 bit
> userland), do you think it's worth to try it?
> I don't force barrier in fstab, on kernel hardened-2.6.36 (which doesn't
> throws warnings), /proc/mounts shows barrier=1, there is in dmesg:
> [...]
> [    0.209834] Initialising Xen virtual ethernet driver.
> [    0.217792] blkfront: xvda: barriers enabled (tag)
> [...]
> On vanilla-2.6.39-rc5-git7 i've got in log:
> [    6.505772] blkfront: xvda: empty write barrier op failed
> [    6.505776] blkfront: xvda: barriers disabled
> (I hope i didn't omit important part from dmesg, i didn't want to paste
> tons of line)

Iirc this stuff ultimately lead us to an irq migration bug. Are you
running irqbalance? If so, can you turn it off and see if that helps?


Xen-devel mailing list