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    SubjectRe: [Xen-devel] [PATCH] xen: always set the sched clock as unstable
    On 16/04/12 17:05, Dan Magenheimer wrote:
    >> From: David Vrabel [mailto:david.vrabel@citrix.com]
    >> Subject: Re: [Xen-devel] [PATCH] xen: always set the sched clock as unstable
    >
    > Nacked-by: Dan Magenheimer <dan.magenheimer@oracle.com>

    Fair enough,

    > [A stable clock] should be true for Xen 4.0+ (but not for pre-Xen-4.0).

    The original customer problem is on a host with Xen 3.4. What do you
    recommend for Linux guests running such hosts?

    > In fact, it might be wise for a Xen-savvy kernel to check to see
    > if it is running on Xen-4.0+ and, if so, force clocksource=tsc
    > and tsc=reliable.

    So, should the xen clocksource do:

    if Xen 4.0+
    clock is stable, use rdtsc only.
    else
    clock is unstable, use existing pvclock implementation.

    David


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