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    SubjectRe: [CFS Bandwidth Control v4 0/7] Introduction
    On Mon, Feb 21, 2011 at 10:47:12AM +0800, Xiao Guangrong wrote:
    > On 02/16/2011 11:18 AM, Paul Turner wrote:
    > > Hi all,
    > >
    > > Please find attached v4 of CFS bandwidth control; while this rebase against
    > > some of the latest SCHED_NORMAL code is new, the features and methodology are
    > > fairly mature at this point and have proved both effective and stable for
    > > several workloads.
    > >
    > > As always, all comments/feedback welcome.
    > >
    >
    > Hi Paul,
    >
    > Thanks for the great features!
    >
    > I applied the patchset to kvm tree, then tested with kvm guest, unfortunately,
    > it seems don't work normally.
    >
    > The steps is follow:
    >
    > # mount -t cgroup -o cpu none /mnt/
    > # qemu-system-x86_64 -enable-kvm -smp 4 -m 512M -drive file=fc64.img,index=0,media=disk
    >
    > Don't do any configuration in cgroup, and run the kvm guest directly (don't use libvirt),
    > the guest booted very slowly and i saw some "soft lockup" bugs reported in the guest,
    > i also noticed one CPU usage is 100% for more than 60s and other CPUs is 10%~30% in the host
    > when guest was booting.
    >
    > And if cgroup is not mounted, the guest runs well.
    >

    Hi Xiao Guangrong,

    Thanks for testing the patches. I do see some soft lockups in the
    guest when I mount the cgroup and start VM using qemu-kvm.

    Will get back after further investigation.

    Regards,
    Bharata.


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