From: Christoph Rohland <cr@sap.com>
To: Tigran Aivazian <tigran@veritas.com>
Cc: Andi Kleen <ak@suse.de>, Jeff Garzik <jgarzik@mandrakesoft.com>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
Mikael Pettersson <mikpe@csd.uu.se>, Jordan <ledzep37@home.com>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: Error in x86 CPU capabilities starting with test5/6
Date: 17 Nov 2000 15:30:26 +0100 [thread overview]
Message-ID: <qwwsnoqu0vx.fsf@sap.com> (raw)
In-Reply-To: <Pine.LNX.4.21.0011171400550.8383-100000@saturn.homenet>
In-Reply-To: Tigran Aivazian's message of "Fri, 17 Nov 2000 14:02:29 +0000 (GMT)"
Hi Tigran,
On Fri, 17 Nov 2000, Tigran Aivazian wrote:
> On Fri, 17 Nov 2000, Andi Kleen wrote:
>> [of course rdtsc only works properly on UP or with bind_cpu()]
>
> I thought Linux kernel does synchronize them on boot? So, you are
> saying I cannot rely on this being 100% correct?
Yes, it does so far. And if we cannot assume this to be correct in the
microsecond scale on smp machines with homogenous non-powersaving cpus
we will loose on some benchmarks. So far it works on all our servers.
Greetings
Christoph
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next prev parent reply other threads:[~2000-11-17 15:01 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-11-17 9:50 Error in x86 CPU capabilities starting with test5/6 Jordan
2000-11-17 11:39 ` Mikael Pettersson
2000-11-17 11:58 ` Tigran Aivazian
2000-11-17 12:10 ` Alan Cox
2000-11-17 12:51 ` Christoph Rohland
2000-11-17 13:08 ` Jeff Garzik
2000-11-17 13:21 ` Christoph Rohland
2000-11-17 13:31 ` Andi Kleen
2000-11-17 13:40 ` Jeff Garzik
2000-11-17 13:54 ` Andi Kleen
2000-11-17 14:02 ` Tigran Aivazian
2000-11-17 14:30 ` Christoph Rohland [this message]
2000-11-17 14:50 ` Alan Cox
2000-11-17 14:00 ` Arjan van de Ven
2000-11-17 15:18 ` Andrea Arcangeli
2000-11-17 16:06 ` Christoph Rohland
2000-11-17 18:28 ` Andrea Arcangeli
2000-11-18 9:57 ` Christoph Rohland
2000-11-19 10:31 ` Albert D. Cahalan
2000-11-17 13:38 ` Mikael Pettersson
2000-11-17 12:04 ` Andi Kleen
2000-11-17 12:14 ` Jan Niehusmann
2000-11-17 12:22 ` Andi Kleen
2000-11-17 13:26 ` Mohammad A. Haque
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