linux-kernel - Re: cpufreq longhaul locks up

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Message-ID: <Pine.LNX.4.61.0705042042270.18504@yvahk01.tjqt.qr>
Date:	Fri, 4 May 2007 20:48:27 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Rafał Bilski <rafalbilski@...eria.pl>
cc:	Dave Jones <davej@...emonkey.org.uk>, cpufreq@...ts.linux.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: cpufreq longhaul locks up


On May 4 2007 19:08, Rafał Bilski wrote:
>
>Btw. I've been writting many times: if You want to use ondemand with 
>Longhaul You don't need cpufreq at all.

Does VIA Nehemiah do hardware-driven autoregulation like Transmeta
Crusoe too? (I suspect no, have not seen that happen.)

>It is just one another cool gadget for You.
>Longhaul wasn't designed to change frequency often. 

Is there a way I can start with a specific governor (powersave) right
from the start so that all devices that Linux will initialize assume
the CPU runs at <choose something> MHz?

>It has big latency and requires so much preparation that it isn't worth 
>if You don't need to save power or cool down CPU. 

I found frequency switching on my VIA to be fast enough.


Jan
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