Re: [Xen-devel] Kernel aio bug in Debian 2.6.32-5-xen kernel?

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2012-04-26 at 14:43 +0100, George Dunlap wrote:
> On Thu, Apr 26, 2012 at 2:24 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> > On Thu, 2012-04-26 at 14:14 +0100, George Dunlap wrote:
> >> On Thu, Apr 26, 2012 at 1:07 PM, Stefano Stabellini
> >> <stefano.stabellini@xxxxxxxxxxxxx> wrote:
> >> >> However this kernel does have blktap so why is qemu based AIO being used
> >> >> at all?
> >> >
> >> > If blktap is present and working then libxl only uses QEMU for
> >> > qcow/qcow2 disk images.
> >>
> >> Hmm -- except that the process that's dying is clearly QEMU, and the
> >> disk images are definitely not qcow*, and Ian seems to think this
> >> kernel has blktap (how could I tell?), so something's not right.
> >
> > It looks like it is a module -- lsmod should confirm, maybe it's a
> > simple as loading it?
> >
> > (if so let me know and I'll be sure to include that when I write up
> > "installing a Debian Dom0")
> 
> Indeed, blktap was *not* loaded, and "modprobe blktap" seems make things work.
> 
> Should this be done in one of the initscripts?  Or perhaps by xl?

xencommons should do it, IMHO.

> It would still be good to get the AIO stuff fixed in some way, as I'm
> sure I'm not the only one who's going to run into this problem.

Stefano has fixed it in the upstream kernel. I'm afraid there is no
realistic chance of it being fixed in the squeeze kernel at this stage.

Ian.



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