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    SubjectRe: [RFC PATCH 0/3] directed yield for Pause Loop Exiting
    On 12/11/2010 08:57 AM, Balbir Singh wrote:

    > If the vpcu holding the lock runs more and capped, the timeslice
    > transfer is a heuristic that will not help.

    That indicates you really need the cap to be per guest, and
    not per VCPU.

    Having one VCPU spin on a lock (and achieve nothing), because
    the other one cannot give up the lock due to hitting its CPU
    cap could lead to showstoppingly bad performance.

    --
    All rights reversed


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