linux-kernel - Re: hires timer patchset [was Re: 2.6.19 -mm merge plans]

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Date:	Sat, 23 Sep 2006 11:09:26 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	Voluspa <lista1@...hem.se>
Cc:	brugolsky@...emetry-investments.com, mingo@...e.hu, pavel@...e.cz,
	akpm@...l.org, tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: hires timer patchset [was Re: 2.6.19 -mm merge plans]

On Sat, 2006-09-23 at 04:17 +0200, Voluspa wrote:

> Here's another data point: I tried 2.6.18-rt3 today on a x86_64
> notebook. I'm on an eternal quest for extended battery time, so
> NO_HZ would be perfect. Long story shortened, HIGH_RES_TIMERS
> (prerequisite for NO_HZ) caused the CPU to never step down from max
> speed (ondemand, powernow_k8) at 2200 MHz.
> 
> In addition, something invisible used very frequent bursts of ~30% SYS
> CPU. Turning from PREEMPT_RT to PREEMPT_DESKTOP introduced occasional
> bursts of ~50% USER CPU (mixed with the SYS). Toggling RCU model
> made no difference.
> 

It seems like you don't need all of 2.6.18-rt3 , you just want dynamic
tick .. You can obtain just the HRT/dynamic tick patch from here,

http://www.tglx.de/projects/hrtimers/2.6.18/

Daniel

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