Re: [Qemu-devel] [Qemu-discuss] iolimits for virtio-9p

[Pradeep Kiruvale <pradeepkiruvale@gmail.com>]

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On 27 April 2016 at 10:38, Alberto Garcia <berto@igalia.com> wrote:

> On Wed, Apr 27, 2016 at 09:29:02AM +0200, Pradeep Kiruvale wrote:
>
> > Thanks for the reply. I am still in the early phase, I will let you
> > know if any changes are needed for the APIs.
> >
> > We might also have to implement throttle-group.c for 9p devices, if
> > we want to apply throttle for group of devices.
>
> Fair enough, but again please note that:
>
> - throttle-group.c is not meant to be generic, but it's tied to
>   BlockDriverState / BlockBackend.
> - it is currently being rewritten:
>   https://lists.gnu.org/archive/html/qemu-block/2016-04/msg00645.html
>
> If you can explain your use case with a bit more detail we can try to
> see what can be done about it.
>
>
We want to use  virtio-9p for block io instead of virtio-blk-pci. But in
case of
virtio-9p we can just use fsdev devices, so we want to apply throttling
(QoS)
on these devices and as of now the io throttling only possible with the
-drive option.

As a work around we are doing the throttling using cgroup. It has its own
costs.
So, we want to have throttling for fsdev devices inside the qemu itself. I
am just
trying to understand and estimate time required for implementing it for the
fsdevices.


-Pradeep

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