linux-kernel - Re: cpufreq: too long transition latency

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Message-ID: <20070618202849.GA27690@redhat.com>
Date:	Mon, 18 Jun 2007 16:28:49 -0400
From:	Dave Jones <davej@...hat.com>
To:	Meelis Roos <mroos@...ux.ee>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	davej@...emonkey.org.uk
Subject: Re: cpufreq: too long transition latency

On Mon, Jun 18, 2007 at 11:23:27PM +0300, Meelis Roos wrote:
 > I have the following messages in my laptops dmesg
 > 
 > ondemand governor failed to load due to too long transition latency
 > 
 > and activating ondemand governor fails. This seems to be introduced in 
 > 2.6.22-rc* series - I seem to remember that 2.6.21 was OK but can not 
 > test at the moment.
 > 
 > Laptop is IBM X20, 440BX chipset, Pentium III (Coppermine). Config and 
 > full dmesg are below.

speedstep-ich takes a long time to transition.
as ondemand can change speeds frequently, this can cause unacceptable
slowdowns, so it prevents itself from being used.

	Dave

-- 
http://www.codemonkey.org.uk
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