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Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors

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From: Pierre Ossman <drzeus-list@...>
To: Pierre Ossman <drzeus-list@...>
Cc: Pallipadi, Venkatesh <venkatesh.pallipadi@...>, Dave Jones <davej@...>, Andi Kleen <andi@...>, Alan Stern <stern@...>, LKML <linux-kernel@...>, Adam Belay <abelay@...>, Lee Revell <rlrevell@...>, <linux-pm@...>, Pavel Machek <pavel@...>
Subject: Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors
Date: Wednesday, March 5, 2008 - 4:40 am

On Wed, 5 Mar 2008 07:02:01 +0100
Pierre Ossman <drzeus-list@drzeus.cx> wrote:


I take this back. They might be working just fine. It seems I've been looking at a too small piece of the puzzle. This machine has a dual core processor, and the governors control each core independently. Unfortunately it's the power fluctuations of the entire socket that causes noise, not just each processor.

So I need to build some global algorithm instead of one per core. Ideas are welcome.

From what I can tell, disabling one core makes the noise go away. So I guess both cores need to go into C3 (or perhaps one C2 and one C3) at the same time to cause the problem. I'm not 100% sure of this as the damn noise comes and goes, but I've been running for an hour or so now with one core disabled and without my anti-noise patch.

Rgds
-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  PulseAudio, core developer          http://pulseaudio.org
  rdesktop, core developer          http://www.rdesktop.org
--
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Messages in current thread:
[RFC][PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Fri Feb 29, 2:38 pm)
[PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Mon Mar 3, 4:18 pm)
Re: [PATCH] cpuidle: avoid singing capacitors, Pavel Machek, (Mon Mar 3, 4:46 pm)
Re: [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Mon Mar 3, 5:03 pm)
Re: [PATCH] cpuidle: avoid singing capacitors, Pavel Machek, (Mon Mar 3, 5:08 pm)
RE: [PATCH] cpuidle: avoid singing capacitors, Pallipadi, Venkatesh, (Mon Mar 3, 5:14 pm)
Re: [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Mon Mar 3, 5:17 pm)
RE: [PATCH] cpuidle: avoid singing capacitors, Pallipadi, Venkatesh, (Mon Mar 3, 6:04 pm)
Re: [PATCH] cpuidle: avoid singing capacitors, Andi Kleen, (Mon Mar 3, 7:09 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Alan Stern, (Mon Mar 3, 7:05 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Andi Kleen, (Mon Mar 3, 7:10 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Dave Jones, (Tue Mar 4, 12:00 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Andi Kleen, (Tue Mar 4, 5:40 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Tue Mar 4, 2:14 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Tue Mar 4, 1:19 pm)
RE: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pallipadi, Venkatesh, (Tue Mar 4, 3:01 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Wed Mar 5, 2:02 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Wed Mar 5, 4:40 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Len Brown, (Wed Mar 12, 4:31 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Thu Mar 6, 4:27 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Sun Mar 9, 10:16 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Tue Mar 11, 3:51 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Andi Kleen, (Tue Mar 11, 6:48 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Len Brown, (Wed Mar 12, 3:17 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Tue Mar 11, 11:20 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Tue Mar 11, 1:31 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pavel Machek, (Mon Mar 10, 6:00 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Mon Mar 10, 8:49 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Len Brown, (Wed Mar 12, 3:11 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Thu Mar 13, 12:34 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Fri Mar 14, 3:40 pm)
RE: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pallipadi, Venkatesh, (Fri Mar 14, 5:15 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Fri Mar 14, 8:41 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Thu Mar 13, 1:49 pm)
RE: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pallipadi, Venkatesh, (Thu Mar 13, 12:47 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Thu Mar 13, 1:44 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pavel Machek, (Thu Mar 13, 4:10 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Andi Kleen, (Thu Mar 13, 6:42 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Len Brown, (Fri Mar 14, 12:13 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Andi Kleen, (Mon Mar 10, 9:04 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Mon Mar 10, 9:29 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Henrique de Moraes Holschuh..., (Sun Mar 9, 3:30 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Sun Mar 9, 4:14 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Henrique de Moraes Holschuh..., (Sun Mar 9, 4:41 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Henrique de Moraes Holschuh..., (Sun Mar 9, 4:54 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Alan Stern, (Sun Mar 9, 2:50 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Rafael J. Wysocki, (Sun Mar 9, 2:19 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pavel Machek, (Wed Mar 5, 5:03 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Wed Mar 5, 9:42 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pavel Machek, (Wed Mar 5, 9:47 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Wed Mar 5, 9:52 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Andi Kleen, (Tue Mar 4, 1:29 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Tue Mar 4, 1:30 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Andi Kleen, (Tue Mar 4, 1:43 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Tue Mar 4, 2:04 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Andi Kleen, (Tue Mar 4, 2:34 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Wed Mar 5, 2:04 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Andi Kleen, (Wed Mar 5, 11:48 am)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Wed Mar 5, 12:53 pm)
Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors, Andi Kleen, (Wed Mar 5, 1:32 pm)
Re: [RFC][PATCH] cpuidle: avoid singing capacitors, Andi Kleen, (Mon Mar 3, 8:36 am)
Re: [RFC][PATCH] cpuidle: avoid singing capacitors, Lee Revell, (Sat Mar 1, 10:27 pm)
Re: [RFC][PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Sun Mar 2, 10:17 am)
Re: [RFC][PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Sat Mar 1, 9:40 am)
Re: [RFC][PATCH] cpuidle: avoid singing capacitors, Lennart Sorensen, (Fri Feb 29, 5:44 pm)
Re: [RFC][PATCH] cpuidle: avoid singing capacitors, Pierre Ossman, (Sat Mar 1, 8:31 am)