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    SubjectRe: [Xen-devel] [PATCH 1/3] cpuidle: If disable_cpuidle() is called, set pm_idle to default_idle.
    On Sun, Nov 13, 2011 at 01:00:15AM -0500, Len Brown wrote:
    > > And just found that there is a BZ for this as well:
    > > https://bugzilla.redhat.com/show_bug.cgi?id=739499
    > >
    > > And this patch fixes the Linux kernel to boot under Amazon EC2.
    >
    > doesn't matter.
    >
    > Working around an Amazon EC2 bug in a newly compiled upstream kernel
    > isn't going to help with any of the kernels that don't include that workaround.

    Prior to 3.1 we did have a solution for this - we would use the default_idle
    and not pick and/choose one based on the CPUID flags.

    It was not really a choice made by "hypervisor wrongly advertises the
    MWAIT flag", but rather that we want to use the safe_halt, which ends up
    calling the yield hypercall.

    That is the optimal solution irregardless of what version of hypervisor
    is being used.

    >
    > Amazon EC2 should not advertise MWAIT support that it does not have,
    > and all kernels should run on it w/o any workaround.
    >
    > Len Brown, Intel Open Source Technology Center
    >
    > _______________________________________________
    > Xen-devel mailing list
    > Xen-devel@lists.xensource.com
    > http://lists.xensource.com/xen-devel


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