Re: [PATCH 0/3] Improve TSC as a clocksource under VMware

From: Pavel Machek
Date: Tue Oct 21 2008 - 05:50:19 EST


> Hi,
>
> This patch set makes some changes to the TSC code, so that it is always
> used as the default clocksource when running under VMware.
> The first 2 patches do the ground work of adding code to detect if we
> are running under VMware.
> The third patch adds a tsc_reliable flag which tells us that TSC is
> reliable on this system, so that we can skip some tests which can
> potentially mark TSC as unstable. Details under individual patch
> headers.

How do you _know_ TSC is stable under VMWare? AFAICT, accesses to TSC
are not virtualized and system VMWare runs on may still use frequency
scaling, no?
Pavel
--
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