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

To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Subject: Re: [Xen-devel] Re: [b.g.o.358549] blkfront: Move blkif_interrupt into a tasklet.
From: Marcin Mirosław <marcin@xxxxxxxx>
Date: Fri, 06 May 2011 00:57:23 +0200
Cc: kernel@xxxxxxxxxx, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, daniel.stodden@xxxxxxxxxx
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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)


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