From: Joel Becker <Joel.Becker@oracle.com>
To: jonathan@jonmasters.org
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
Lee Revell <rlrevell@joe-job.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Robert Love <rml@novell.com>
Subject: Re: How is user space notified of CPU speed changes?
Date: Sun, 24 Oct 2004 22:53:38 -0700 [thread overview]
Message-ID: <20041025055338.GG27633@ca-server1.us.oracle.com> (raw)
In-Reply-To: <35fb2e590410231635616f10c9@mail.gmail.com>
On Sun, Oct 24, 2004 at 12:35:46AM +0100, Jon Masters wrote:
> Out of sheer interest, you said you had an example box which did this.
> I've never actually seen a modern SMP setup with different cock
> frequencies (even accepting it's possible) - can you give me a more
> modern example? I'm sure they're out there, I've just missed it, and I
> have to confess to not being aware that Linux supported this kind of
> setup.
I have a dual celeron with a 433 CPU and a 466 CPU in the slots.
It works, as long as you don't rely on TSC synchronicity. Also, IBM
x440 boxes don't sync the TSCs between each group of 4 CPUs (that is,
each group of 4 is synced internally, but different from each other
group of 4).
Joel
--
"Vote early and vote often."
- Al Capone
Joel Becker
Senior Member of Technical Staff
Oracle Corporation
E-mail: joel.becker@oracle.com
Phone: (650) 506-8127
next prev parent reply other threads:[~2004-10-25 5:54 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-21 23:01 How is user space notified of CPU speed changes? Lee Revell
2004-10-22 11:23 ` Alan Cox
2004-10-22 14:12 ` Con Kolivas
2004-10-22 18:05 ` Lee Revell
2004-10-22 18:57 ` Andreas Dilger
2004-10-22 19:40 ` Chris Friesen
2004-10-22 19:46 ` Lee Revell
2004-10-22 20:28 ` Alan Cox
2004-10-22 21:46 ` Chris Friesen
2004-10-22 23:25 ` Lee Revell
2004-10-25 15:28 ` Chris Friesen
2004-10-23 5:10 ` Lee Revell
2004-10-23 10:53 ` Matthew Garrett
2004-10-23 21:19 ` Alan Cox
2004-10-23 22:42 ` Lee Revell
2004-10-23 23:17 ` Jon Masters
2004-10-24 1:40 ` Lee Revell
2004-10-24 14:02 ` Alan Cox
2004-10-26 2:38 ` Lee Revell
2004-10-26 4:05 ` Lee Revell
2004-10-23 23:35 ` Jon Masters
2004-10-23 23:36 ` Jon Masters
2004-10-24 14:04 ` Alan Cox
2004-10-25 5:53 ` Joel Becker [this message]
2004-10-24 20:02 ` Robert Love
[not found] <1098399709.4131.23.camel@krustophenia.net.suse.lists.linux.kernel>
[not found] ` <1098444170.19459.7.camel@localhost.localdomain.suse.lists.linux.kernel>
[not found] ` <1098508238.13176.17.camel@krustophenia.net.suse.lists.linux.kernel>
[not found] ` <1098566366.24804.8.camel@localhost.localdomain.suse.lists.linux.kernel>
2004-10-23 23:54 ` Andi Kleen
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