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Re: [Qemu-devel] [PATCH v2] xen_disk: support "direct-io-safe" backend o
From: |
Stefano Stabellini |
Subject: |
Re: [Qemu-devel] [PATCH v2] xen_disk: support "direct-io-safe" backend option |
Date: |
Fri, 28 Jun 2013 11:56:29 +0100 |
User-agent: |
Alpine 2.02 (DEB 1266 2009-07-14) |
On Fri, 28 Jun 2013, Alex Bligh wrote:
> Stefano,
>
> --On 27 June 2013 19:16:30 +0100 Stefano Stabellini
> <address@hidden> 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).