Re: [RFC PATCH 0/3] directed yield for Pause Loop Exiting

Rik van Riel
2010-12-13T17:02:51Z

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