RE: [Xen-devel] HVM domain with write caching going on somewhere to disk

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> On 8/11/07 10:40, "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
wrote:
> 
> > I've noticed before that any changes made in a Windows HVM domain
> > shortly before an 'xm shutdown' don't ever get written out...
> >
> > Anyway, is there a way to make sure that the qemu stuff doesn't do
any
> > write caching at all?
> 
> I don't think qemu caches writes internally, and also I believe that
> outstanding I/O requests are serviced before a domain is shut down

Are they serviced before a domain is destroyed (eg 'xm destroy')? Maybe
that's what I was using when I noticed it...

> Could
> there be a problem with data ending up in the buffer cache in dom0
kernel?

Hmmm... shouldn't the DomU->qemu->device and DomU->blkbackend->device
path's both have visibility to the same buffer cache though?

Maybe the problem isn't what I thought it was. It seems strange that
windows would boot almost completely using my PV drivers and then barf
at the last minute though.

Thanks

James

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