Re: [Xen-devel] RFC/PATCH: hdparm tunable IDE write cache for HVM

["Christian Limpach" <christian.limpach@xxxxxxxxx>]

On 8/11/06, Rik van Riel <riel@xxxxxxxxxx> wrote:
> qemu 0.8.2 has a flush callback to the storage backends, so now it is
> possible to implement hdparm tunable IDE write cache enable/disable for
> guest domains, allowing people to pick speed or data consistency on a
> case by case basis.
>
> As an added benefit, really large LBA48 IOs will now no longer be broken
> up into smaller IOs on the host side.
>
> What do you think?
Looks good, are you confident that you have identified all the places
where a flush is needed?  Doesn't qemu do flushes in the first place
and wouldn't it then have the same issues?

   christian

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