From: Lee Revell <rlrevell@joe-job.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: 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 14:05:16 -0400 [thread overview]
Message-ID: <1098468316.5580.18.camel@krustophenia.net> (raw)
In-Reply-To: <1098444170.19459.7.camel@localhost.localdomain>
On Fri, 2004-10-22 at 07:23, Alan Cox wrote:
> On Gwe, 2004-10-22 at 00:01, Lee Revell wrote:
> > This issue came up on the JACK (http://jackit.sf.net) mailing list.
> > Google was not helpful so I ask here.
> >
> > JACK needs to know the CPU speed, in order to calculate the DSP load
> > among other things. It used to be a valid assumption that you could
> > calculate it on startup and it would not change.
>
> No it did not. It has never been a safe assumption. Even my old PC110
> does APM non-linux assisted shifts between 8 16 and 33Mhz. In addition
> there are boxes with dual CPU's and different multipliers - dual
> 300/450's were not uncommon.
>
> And thats before we even mention such things at hyped-threading.
Seems like you are implying that any userspace app that needs to know
the CPU speed is broken. Is this correct?
Lee
next prev parent reply other threads:[~2004-10-22 18:08 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 [this message]
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
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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