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

To: Juergen Gross <JGross@xxxxxxxx>, Kevin Stange <kevin@xxxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>

Date: Wed, 22 Jan 2020 18:56:58 +0000

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List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

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Thread-topic: [Xen-devel] libvirt support for scheduler credit2

On 1/21/20 10:05 AM, Jürgen Groß wrote: > 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: You would see the same with libvirt.git master, sorry. ATM the libvirt libxl driver is unaware of the credit2 scheduler. Hmm, as I recall Dario was going to provide a patch for libvirt :-). But he is quite busy so it will have to be added to my very long todo list. Regards, Jim >> >> # 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. >> > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxxx > https://lists.xenproject.org/mailman/listinfo/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel

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