linux-kernel - Re: AMD X2 unsynced TSC fix?

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Message-Id: <1162059732.14733.8.camel@mindpipe>
Date:	Sat, 28 Oct 2006 14:22:11 -0400
From:	Lee Revell <rlrevell@...-job.com>
To:	Andi Kleen <ak@...e.de>
Cc:	thockin@...kin.org, vojtech@...e.cz, Jiri Bohac <jbohac@...e.cz>,
	Luca Tettamanti <kronos.it@...il.com>,
	linux-kernel@...r.kernel.org, john stultz <johnstul@...ibm.com>
Subject: Re: AMD X2 unsynced TSC fix?

On Fri, 2006-10-27 at 20:59 -0700, Andi Kleen wrote:
> > Fortunately, we usually have an HPET, these days.  You can
> definitely
> > resync and get near-linear values of RDTSC.
> 
> No we don't -- most BIOS still don't give us the HPET table 
> even when it is there in hardware. In the future this will change sure
> but people will still run a lot of older motherboards. 

I have exactly such a system (see thread "x86-64 with nvidia MCP51
chipset: kernel does not find HPET").  Is there anything at all I can do
to make the kernel see the HPET?  Can I try to guess the address?  BIOS
upgrade?

Lee

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