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    SubjectRe: Performance overhead of get_cycles_sync

    * Arjan van de Ven <arjan@infradead.org> wrote:

    > > * Dor Laor <dor.laor@gmail.com> wrote:
    > >
    > > The patch below should resolve this - could you please test and Ack
    > > it? But this CPUID was present in v2.6.23 too, so why did it only
    > > show up in 2.6.24-rc for you?
    >
    > isn't this probably wrong since this code is also used in the vsyscall
    > code..

    the TSC clocksource (and hence the vsyscall code) is turned off on
    systems that fail the TOD/CLOCK portion of this test:

    http://people.redhat.com/mingo/time-warp-test/time-warp-test.c

    i.e. on the majority of systems in place.

    Ingo


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