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    SubjectRe: [PATCH/RFC] stop_machine: make stop_machine_run more virtualization friendly
    Date
    Am Donnerstag, 8. Mai 2008 schrieb Jeremy Fitzhardinge:
    > Christian Borntraeger wrote:
    > > On kvm I have seen some rare hangs in stop_machine when I used more guest
    > > cpus than hosts cpus. e.g. 32 guest cpus on 1 host cpu triggered the
    > > hang quite often. I could also reproduce the problem on a 4 way z/VM host
    with
    > > a 64 way guest.
    > >
    >
    > I think that's one of those "don't do that then" cases ;)

    I really like 64 guest cpus as a good testcase for all kind of things.

    >
    > I think x86 (at least) is now using ticket locks, which is fair. Which
    > kernel are you seeing this problem on?

    Sorry, forgot to mention. Its kvm.git from 2 days ago on s390.



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