Re: Using tools such as ionice inside guests

Paolo Bonzini
2016-05-18T17:12:16Z

On 18/05/2016 18:26, Emmanuel Lacour wrote:
> Thanks, it's a bad news for us :(
>
> I will try to play with cgroups io throttling to limit by iops or bytes
> read, but it'll be a hard limit rather than a priority :(

That probably won't work either, but you can use io throttling on the
host too.

> Do you think there could be back some io priority throttling in not so
> far future kernels?

I wouldn't oppose a patch to add back the non-mq path, but as far as I
know nobody is working on it. It's not hard and I can help if you need
guidance.

Adding I/O scheduler support to blk-mq has been promised for at least a
year now, but I'm not aware of which kernel release might have the work.
It's not even been submitted to LKML, so I guess it's quite far away.

Thanks,

Paolo