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

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Message-ID: <20061028052837.GC1709@1wt.eu>
Date:	Sat, 28 Oct 2006 07:28:38 +0200
From:	Willy Tarreau <w@....eu>
To:	Lee Revell <rlrevell@...-job.com>
Cc:	Andi Kleen <ak@...e.de>, thockin@...kin.org,
	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, Oct 27, 2006 at 11:28:00PM -0400, Lee Revell wrote:
> On Fri, 2006-10-27 at 18:04 -0700, Andi Kleen wrote:
> > I don't think it makes too much sense to hack on pure RDTSC when 
> > gtod is fast enough -- RDTSC will be always icky and hard to use.
> 
> I agree FWIW, our application would be happy to just use gtod if it
> wasn't so slow on these machines.

Agreed, I had to turn about 20 dual-core servers to single core because
the only way to get a monotonic gtod made it so slow that it was not
worth using a dual-core. I initially considered buying one dual-core
AMD for my own use, but after seeing this, I'm definitely sure I won't
ever buy one as long as this problem is not fixed, as it causes too
many problems.

Willy

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