From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
To: Alex Bligh <alex@alex.org.uk>
Cc: xen-devel@lists.xensource.com,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Ian Jackson <Ian.Jackson@eu.citrix.com>,
qemu-devel@nongnu.org, Anthony Liguori <anthony@codemonkey.ws>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [Qemu-devel] [PATCH v2] xen_disk: support "direct-io-safe" backend option
Date: Fri, 28 Jun 2013 11:56:29 +0100 [thread overview]
Message-ID: <alpine.DEB.2.02.1306281144180.4782@kaball.uk.xensource.com> (raw)
In-Reply-To: <4FE65DE3CFE5553A443BD09F@nimrod.local>
On Fri, 28 Jun 2013, Alex Bligh wrote:
> Stefano,
>
> --On 27 June 2013 19:16:30 +0100 Stefano Stabellini
> <stefano.stabellini@eu.citrix.com> 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).
WARNING: multiple messages have this Message-ID (diff)
From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
To: Alex Bligh <alex@alex.org.uk>
Cc: xen-devel@lists.xensource.com,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Ian Jackson <Ian.Jackson@eu.citrix.com>,
qemu-devel@nongnu.org, Anthony Liguori <anthony@codemonkey.ws>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [PATCH v2] xen_disk: support "direct-io-safe" backend option
Date: Fri, 28 Jun 2013 11:56:29 +0100 [thread overview]
Message-ID: <alpine.DEB.2.02.1306281144180.4782@kaball.uk.xensource.com> (raw)
In-Reply-To: <4FE65DE3CFE5553A443BD09F@nimrod.local>
On Fri, 28 Jun 2013, Alex Bligh wrote:
> Stefano,
>
> --On 27 June 2013 19:16:30 +0100 Stefano Stabellini
> <stefano.stabellini@eu.citrix.com> 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).
next prev parent reply other threads:[~2013-06-28 10:56 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-27 18:16 [Qemu-devel] [PATCH v2] xen_disk: support "direct-io-safe" backend option Stefano Stabellini
2013-06-27 18:16 ` Stefano Stabellini
2013-06-28 7:56 ` [Qemu-devel] " Paolo Bonzini
2013-06-28 7:56 ` Paolo Bonzini
2013-06-28 10:54 ` [Qemu-devel] " Ian Jackson
2013-06-28 10:54 ` Ian Jackson
2013-06-28 10:57 ` [Qemu-devel] " Stefano Stabellini
2013-06-28 10:57 ` Stefano Stabellini
2013-06-28 8:48 ` [Qemu-devel] " Alex Bligh
2013-06-28 8:48 ` Alex Bligh
2013-06-28 10:44 ` [Qemu-devel] " Ian Jackson
2013-06-28 10:44 ` Ian Jackson
2013-06-28 16:17 ` [Qemu-devel] " Alex Bligh
2013-06-28 16:17 ` Alex Bligh
2013-06-28 16:26 ` [Qemu-devel] " Paolo Bonzini
2013-06-28 16:26 ` Paolo Bonzini
2013-06-28 10:56 ` Stefano Stabellini [this message]
2013-06-28 10:56 ` Stefano Stabellini
2013-06-28 16:16 ` [Qemu-devel] " Stefano Stabellini
2013-06-28 16:51 ` George Dunlap
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