From: Lee Revell <rlrevell@joe-job.com>
To: Chris Friesen <cfriesen@nortelnetworks.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
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: Fri, 22 Oct 2004 15:46:57 -0400 [thread overview]
Message-ID: <1098474416.5580.52.camel@krustophenia.net> (raw)
In-Reply-To: <4179623C.9050807@nortelnetworks.com>
On Fri, 2004-10-22 at 15:40, Chris Friesen wrote:
> Lee Revell wrote:
>
> > Seems like you are implying that any userspace app that needs to know
> > the CPU speed is broken. Is this correct?
>
> No, we're saying that Intel's tsc implementation is broken. <grin>
>
> x86 really could use an on-die register that increments at 1GHz independent of
> clock speed and is synchronized across all CPUs in an SMP box.
Well, it looks like we can just fix JACK to not use the TSC for timing.
Seems like the current design is fundamentally incompatible with CPU
scaling.
Lee
next prev parent reply other threads:[~2004-10-22 19:53 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 [this message]
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
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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