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    SubjectRe: [PATCH 1/5] Add a global synchronization point for pvclock
    On 04/20/2010 09:42 AM, Jeremy Fitzhardinge wrote:
    > On 04/20/2010 11:54 AM, Avi Kivity wrote:
    >
    >> On 04/20/2010 09:23 PM, Jeremy Fitzhardinge wrote:
    >>
    >>> On 04/20/2010 02:31 AM, Avi Kivity wrote:
    >>>
    >>>
    >>>> btw, do you want this code in pvclock.c, or shall we keep it kvmclock
    >>>> specific?
    >>>>
    >>>>
    >>> I think its a pvclock-level fix. I'd been hoping to avoid having
    >>> something like this, but I think its ultimately necessary.
    >>>
    >>>
    >> Did you observe drift on Xen, or is this "ultimately" pointing at the
    >> future?
    >>
    > People are reporting weirdnesses that "clocksource=jiffies" apparently
    > resolves. Xen and KVM are faced with the same hardware constraints, and
    > it wouldn't surprise me if there were small measurable
    > non-monotonicities in the PV clock under Xen. May as well be safe.
    >

    Does the drift only occur on SMP VMs?



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