From: Nebojsa Trpkovic <trx@inbox.ru>
To: cpufreq@www.linux.org.uk
Subject: Re: [PATCH] Another powernow-k7 patch for Desktop XP-M usage
Date: Thu, 21 Oct 2004 02:56:57 +0200 [thread overview]
Message-ID: <41770959.6060403@inbox.ru> (raw)
In-Reply-To: <20041020094304.GC22405@poupinou.org>
Bruno Ducrot wrote:
>Hi,
>
>On Fri, Oct 15, 2004 at 01:26:43AM +0200, Nebojsa Trpkovic wrote:
>
>
>It's a very large latency, preventing to actually making any kind
>of dynamic frequencies really usefull, and since there is no voltage
>scaling, it's IMHO not so usefull for power consuption purpose (though
>this may help for cooling purpose).
>
>
>
Well, I have only two working states (1GHz and 2.1GHz) that I chage by
cpudyn. I poll CPU usage once per 500ms because 1GHz Barton is strong
enough to respond to all my interactive needs without instant switching
to 2.1GHz. Switching to 2.1GHz is done by some realy huge load
(compiling gentoo...) and spikes are neutralized.
So, as I calculated, in the worst scenario there can be only 2 frequency
changes during 1 second, and loosing of ~2ms (~1700ns) per 1 second for
transition purposes is not so big deal (~0.2% of cpu time).
And, yes, I use it for cooling, but to be cool, too ;)
next prev parent reply other threads:[~2004-10-21 0:56 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-12 8:18 [PATCH] Another powernow-k7 patch for Desktop XP-M usage Hendrik Muhs
2004-10-14 23:26 ` Nebojsa Trpkovic
2004-10-20 9:43 ` Bruno Ducrot
2004-10-20 22:05 ` Harald Milz
2004-10-21 0:56 ` Nebojsa Trpkovic [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-10-15 7:05 Hendrik Muhs
2004-10-15 22:28 ` Nebojsa Trpkovic
2004-11-29 21:36 ` Nebojsa Trpkovic
2004-10-16 16:11 ` mark newman
2005-01-14 11:46 ` Jarkko Lavinen
2005-01-17 15:21 ` Hendrik Muhs
2005-01-17 16:31 ` Jarkko Lavinen
2005-01-19 15:35 ` Jarkko Lavinen
2004-12-01 20:09 Hendrik Muhs
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