Re: [Xen-devel] libvirt support for scheduler credit2

[Jürgen Groß <jgross@xxxxxxxx>]

On 21.01.20 17:56, Kevin Stange wrote:
> Hi,
>
> I looked around a bit and wasn't able to find a good answer to this, so
> George suggested I ask here.
Cc-ing Jim.

> Since Xen 4.12, credit2 is the default scheduler, but at least as of
> libvirt 5.1.0 virsh doesn't appear to understand credit2 and produces
> this sort of output:
>
> # xl sched-credit2 -d yw6hk7mo6zy3k8
> Name                                ID Weight  Cap
> yw6hk7mo6zy3k8                       4     10    0
> # virsh schedinfo yw6hk7mo6zy3k8
> Scheduler      : credit2
>
> Compared to a host running credit:
>
> # xl sched-credit -d gvz2b16sq38dv9
> Name                                ID Weight  Cap
> gvz2b16sq38dv9                      14    800    0
> # virsh schedinfo gvz2b16sq38dv9
> Scheduler      : credit
> weight         : 800
> cap            : 0
>
> Trying to change the weight does nothing, not even producing an error
> message:
>
> # virsh schedinfo syuxplsmdihcwc --weight 300
> Scheduler      : credit2
>
> # xl sched-credit2 -d syuxplsmdihcwc
> Name                                ID Weight  Cap
> syuxplsmdihcwc                      23    400    0
>
> Is there a version of libvirt where I can expect this to work, or is it
> not supported yet?  As a workaround for now I've added sched=credit to
> my command line, but it would be nice to gain the benefits of improved
> scheduling at some point.

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