Peter Xu writes:
> On Wed, Jun 12, 2024 at 07:15:19PM +0100, Daniel P. Berrangé wrote:
>> IIUC, with the "fixed-ram" feature, the on-disk format of a saved VM
>> should end up the same whether we're using traditional migration, or
>> multifd migration. Use of multifd is simply an optimization tha
On Wed, Jun 12, 2024 at 07:15:19PM +0100, Daniel P. Berrangé wrote:
> IIUC, with the "fixed-ram" feature, the on-disk format of a saved VM
> should end up the same whether we're using traditional migration, or
> multifd migration. Use of multifd is simply an optimization that lets
> us write RAM in
On Wed, Jun 12, 2024 at 03:08:02PM -0300, Fabiano Rosas wrote:
> Fabiano Rosas writes:
>
> > Peter Xu writes:
> >
> >> On Mon, Jun 10, 2024 at 02:45:53PM -0300, Fabiano Rosas wrote:
> I looked into this and it's cumbersome:
>
> - We'd need to check migrate_direct_io() several times, once to get
Fabiano Rosas writes:
> Peter Xu writes:
>
>> On Mon, Jun 10, 2024 at 02:45:53PM -0300, Fabiano Rosas wrote:
>>> >> AIUI, the issue here that users are already allowed to specify in
>>> >> libvirt the equivalent to direct-io and multifd independent of each
>>> >> other (bypass-cache, parallel).
Peter Xu writes:
> On Mon, Jun 10, 2024 at 02:45:53PM -0300, Fabiano Rosas wrote:
>> >> AIUI, the issue here that users are already allowed to specify in
>> >> libvirt the equivalent to direct-io and multifd independent of each
>> >> other (bypass-cache, parallel). To start requiring both togethe
On Mon, Jun 10, 2024 at 03:02:10PM -0400, Peter Xu wrote:
> On Mon, Jun 10, 2024 at 02:45:53PM -0300, Fabiano Rosas wrote:
> > >> AIUI, the issue here that users are already allowed to specify in
> > >> libvirt the equivalent to direct-io and multifd independent of each
> > >> other (bypass-cache,
On Mon, Jun 10, 2024 at 02:45:53PM -0300, Fabiano Rosas wrote:
> >> AIUI, the issue here that users are already allowed to specify in
> >> libvirt the equivalent to direct-io and multifd independent of each
> >> other (bypass-cache, parallel). To start requiring both together now in
> >> some situa
Peter Xu writes:
> On Fri, Jun 07, 2024 at 03:42:35PM -0300, Fabiano Rosas wrote:
>> Peter Xu writes:
>>
>> > On Thu, May 23, 2024 at 04:05:48PM -0300, Fabiano Rosas wrote:
>> >> We've recently added support for direct-io with multifd, which brings
>> >> performance benefits, but creates a non-
On Fri, Jun 07, 2024 at 03:42:35PM -0300, Fabiano Rosas wrote:
> Peter Xu writes:
>
> > On Thu, May 23, 2024 at 04:05:48PM -0300, Fabiano Rosas wrote:
> >> We've recently added support for direct-io with multifd, which brings
> >> performance benefits, but creates a non-uniform user interface by
Peter Xu writes:
> On Thu, May 23, 2024 at 04:05:48PM -0300, Fabiano Rosas wrote:
>> We've recently added support for direct-io with multifd, which brings
>> performance benefits, but creates a non-uniform user interface by
>> coupling direct-io with the multifd capability. This means that users
On 6/7/24 12:42 PM, Fabiano Rosas wrote:
Peter Xu writes:
On Thu, May 23, 2024 at 04:05:48PM -0300, Fabiano Rosas wrote:
We've recently added support for direct-io with multifd, which brings
performance benefits, but creates a non-uniform user interface by
coupling direct-io with the multifd
On Thu, May 23, 2024 at 04:05:48PM -0300, Fabiano Rosas wrote:
> We've recently added support for direct-io with multifd, which brings
> performance benefits, but creates a non-uniform user interface by
> coupling direct-io with the multifd capability. This means that users
> cannot keep the direct
We've recently added support for direct-io with multifd, which brings
performance benefits, but creates a non-uniform user interface by
coupling direct-io with the multifd capability. This means that users
cannot keep the direct-io flag enabled while disabling multifd.
Libvirt in particular alread
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