linux-kernel - Re: performance differences: "maxcpus=1" vs. "echo 0

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Message-ID: <20080402113132.GA3181@elf.ucw.cz>
Date:	Wed, 2 Apr 2008 13:31:32 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Michael Meyer <mike65134@...oo.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: performance differences: "maxcpus=1" vs. "echo 0 >
	/sys/devices/system/cpu/cpu1/online"

Hi!

> > Ok, and your chip is too old to have "Enhanced Dynamic Acceleration
> > Technology" (Intel, can't you use some reasonable names?!)... both
> > would explain effects you see, and it is neither...
> 
> It is too old to have that. I bought it at the beginning of 2007 and it
> is from the first line of Core 2 Duo processors (released in summer
> 2006). I think "Enhanced Dynamic Acceleration Technology" is only
> available recently.
> 
> > You could try implementing deep sleep (C4) state for cpu hotplug....
> 
> I have to confess that I sneaked unto LKML illegitimately, as I am not
> a kernel hacker.

You can still play one, and submit a patch. Over internet, noone can
tell if you are hacker or not ;-). I would be happy to help with good
advice ;-).
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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