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    SubjectRe: [PATCH 0/3] Improve TSC as a clocksource under VMware
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    On Tue, 2008-10-21 at 02:50 -0700, Pavel Machek wrote:
    > > Hi,
    > >
    > > This patch set makes some changes to the TSC code, so that it is always
    > > used as the default clocksource when running under VMware.
    > > The first 2 patches do the ground work of adding code to detect if we
    > > are running under VMware.
    > > The third patch adds a tsc_reliable flag which tells us that TSC is
    > > reliable on this system, so that we can skip some tests which can
    > > potentially mark TSC as unstable. Details under individual patch
    > > headers.
    >
    > How do you _know_ TSC is stable under VMWare?

    Since we implement it that way :)
    The hypervisor takes care of providing a constant rate TSC to the guest
    on such systems which have variable frequency.

    Thanks,
    Alok

    > AFAICT, accesses to TSC
    > are not virtualized and system VMWare runs on may still use frequency
    > scaling, no?
    > Pavel
    > --
    > (english) http://www.livejournal.com/~pavelmachek
    > (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html



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