Re: [Xen-devel] [Qemu-devel] [PATCH v2] xen_disk: support "direct-io-safe" backend option

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 28 Jun 2013, Alex Bligh wrote:
> Stefano,
> 
> --On 27 June 2013 19:16:30 +0100 Stefano Stabellini
> <stefano.stabellini@xxxxxxxxxxxxx> wrote:
> 
> >  *      Therefore this option gives the backend permission to use
> >  *      O_DIRECT, notwithstanding that bug.
> 
> Looks useful. Are you planning to do this for both emulated and pv
> disks?

This is PV only, at least for the moment: emulated disks always use
writeback caching.
From the performance point of view, making this change for IDE disks is
not very important (because IDE is slow anyway).

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