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Message-ID: <7f800d9f04101922031be5cfe8@mail.gmail.com>
Date: Tue, 19 Oct 2004 22:03:55 -0700
From: Andre Eisenbach <int2str@gmail.com>
Reply-To: Andre Eisenbach <int2str@gmail.com>
To: Con Kolivas <kernel@kolivas.org>
Subject: Re: [PATCH] cpufreq_ondemand
Cc: Alexander Clouter <alex-kernel@digriz.org.uk>,
       venkatesh.pallipadi@intel.com, cpufreq@www.linux.org.uk,
       linux-kernel@vger.kernel.org
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On Mon, 18 Oct 2004 08:35:49 +1000, Con Kolivas <kernel@kolivas.org> wrote:
> I'd much prefer it shot up to 100% or else every time the cpu usage went
> up there'd be an obvious lag till the machine ran at it's capable speed.
>   I very much doubt the small amount of time it spent at 100% speed with
> the default design would decrease the battery life significantly as well.

I like Alexanders idea better and will give it a good try. If the
speed steps down slowly but shoots up 100% quickly (as it is right
now), even a small task (like opening a folder, or scrolling down in a
document) will cause a tiny spike to 100% which takes a while to go
back down. The result is that the CPU spends most of it's time at 100%
or calming down. I wrote a small test program on my notebook which
confirms this.

It's either or. Either you go up AND down slowly (which I would
prefer), or you go up and down immediately. But spiking up and slowly
going back down is not a good combo.

Alex has my vote, even so I have to give if some more testing.

Cheers,
    Andre
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