Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TSC bit is set.

From: Andi Kleen
Date: Wed Oct 22 2008 - 18:06:00 EST


> > Adding it with vmware detection code is not useful.
>
> The VMware detection code is something that's needed anyways for other
> purposes(getting tsc_freq right now). So the code which force sets this
> TSC_CONSTANT bit is trivial.

It would be better to eliminate that too. Why do you need it anyways?

> Apart from that, as i said yesterday, this should be viewed as a special
> case for VMware products which don't already set this bit. Changing the
> behavior for already existing products is not feasible.

On old hypervisors Linux already runs fine without TSC, doesn't it?

-Andi
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