Date: Sat, 23 Sep 2006 13:07:49 +0200
From: Pavel Machek <pavel@ucw.cz>
To: Ingo Molnar <mingo@elte.hu>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org,
       Thomas Gleixner <tglx@linutronix.de>, John Stultz <johnstul@us.ibm.com>,
       Arjan van de Ven <arjan@infradead.org>
Subject: Re: 2.6.19 -mm merge plans
Message-ID: <20060923110749.GC20778@elf.ucw.cz>
References: <20060920135438.d7dd362b.akpm@osdl.org> <20060921131433.GA4182@elte.hu> <20060922130648.GD4055@ucw.cz> <20060922190106.GA32638@elte.hu>
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Hi!

> > > would be nice to merge the -hrt queue that goes right ontop this 
> > > queue. Even if HIGH_RES_TIMERS is "default n" in the beginning. That 
> > > gives us high-res timers and dynticks which are both very important 
> > > features to certain classes of users/devices.
> > 
> > dynticks give benefit of 0.3W, or 20minutes (IIRC) from 8hours on 
> > thinkpad x60... and they were around for way too long. (When baseline 
> > is hz=250, it is 0.5W from hz=1000 baseline). It would be cool to 
> > finally merge them.
> 
> note that this is a new implementation of dynticks though, not Con's 
> older stuff which you probably used, right? But it's fairly low-impact 

(Well, I cheated, and just measured difference between HZ=100 and
HZ=250/1000. Dynticks should be even slightly better than that.)
								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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