From: Arjan van de Ven <arjan@infradead.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Andi Kleen <ak@suse.de>,
Joachim Deguara <joachim.deguara@amd.com>,
Mark Langsdorf <mark.langsdorf@amd.com>,
discuss@x86-64.org, linux-kernel@vger.kernel.org,
cpufreq@lists.linux.org.uk
Subject: Re: [discuss] Re: [PATCH] Allow all Opteron processors to change pstate at same time
Date: Tue, 11 Jul 2006 18:01:23 +0200 [thread overview]
Message-ID: <1152633683.3128.84.camel@laptopd505.fenrus.org> (raw)
In-Reply-To: <1152634538.18028.23.camel@localhost.localdomain>
On Tue, 2006-07-11 at 17:15 +0100, Alan Cox wrote:
> Ar Maw, 2006-07-11 am 15:14 +0200, ysgrifennodd Arjan van de Ven:
> > if you have per cpu offset and speed, then you don't even need to tie
> > all frequencies together... sounds like the best solution to me..
>
> CPU clocks on some systems are not stable relative to one another. Doing
> the maths only works if you know the divergence isn't cause by
> independant clock sources
obviously you do math only on your local cpu, with the values for your
local cpu. And just never ever look at tsc values from another cpu,
consider them entirely uncorrelated for all I care ;)
Within those constraints it should be reasonably ok (there still is trouble
if the tsc stops entirely in idle, but thats a different thing)
next prev parent reply other threads:[~2006-07-11 16:01 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-06 20:31 Mark Langsdorf
2006-07-07 12:10 ` Andi Kleen
2006-07-07 17:36 ` [discuss] " Langsdorf, Mark
2006-07-10 12:45 ` Joachim Deguara
2006-07-10 13:02 ` Joachim Deguara
2006-07-11 12:55 ` Joachim Deguara
2006-07-11 13:07 ` Andi Kleen
2006-07-11 13:14 ` Arjan van de Ven
2006-07-11 16:15 ` Alan Cox
2006-07-11 16:01 ` Arjan van de Ven [this message]
2006-07-11 16:04 ` Andi Kleen
2006-07-11 13:31 ` Langsdorf, Mark
2006-07-11 13:34 ` Arjan van de Ven
2006-07-11 13:51 ` Andi Kleen
2006-07-11 13:14 ` [OT] Evolution use (was: Re: [discuss] Re: [PATCH] Allow all Opteron processors to change pstate at same time) Xavier Bestel
2006-07-12 14:06 ` [discuss] Re: [PATCH] Allow all Opteron processors to change pstate at same time Joachim Deguara
2006-07-12 14:54 ` Andi Kleen
2006-07-25 21:47 ` Langsdorf, Mark
2006-07-26 11:31 ` Joachim Deguara
2006-07-26 16:42 ` Langsdorf, Mark
2006-07-26 16:54 ` Andi Kleen
2006-07-26 18:34 ` Langsdorf, Mark
2006-07-26 18:53 ` Andi Kleen
2006-07-12 16:11 shin, jacob
2006-07-12 16:14 ` Langsdorf, Mark
2006-07-13 13:06 ` Pavel Machek
2006-07-13 14:32 ` Joachim Deguara
2006-07-16 1:56 ` Pavel Machek
2006-07-17 7:37 ` Joachim Deguara
2006-07-20 15:59 ` Pavel Machek
2006-07-13 13:37 Bhavana Nagendra
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