linux-kernel - Re: [PATCH] Skip tsc synchronization checks if CONSTANT

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Message-ID: <49021FCD.8080209@zytor.com>
Date:	Fri, 24 Oct 2008 12:19:41 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	akataria@...are.com, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Daniel Hecht <dhecht@...are.com>
Subject: Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TSC bit is
 set.

Andi Kleen wrote:
> 
> In the field they will just continue using clock=pit, like they
> always did on vmware. And also they will not update the Linux kernel.
> 

That is a totally bogus assumption.  You will typically have the host 
platform (Vmware in this case) move much much slower than the guests.

> This is strictly for new installations. And I frankly don't 
> see why Linux needs to get white listed workarounds when the 
> Hypervisor couldn't as well be fixed. We have the bizarre
> situation here where a HV vendor tries to add workarounds
> to Linux instead of fixing it on their products.

... just like every other hardware vendor.

	-hpa
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