linux-kernel - Re: [PATCH] cpu-freq: add troubleshooting section for FSB changes

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Date:	Sat, 7 Nov 2009 22:10:00 +0100
From:	Thomas Renninger <trenn@...e.de>
To:	"Luis R. Rodriguez" <lrodriguez@...eros.com>
Cc:	davej@...hat.com, cpufreq@...r.kernel.org,
	linux-kernel@...r.kernel.org, mcgrof@...il.com,
	Matthew Garrett <mjg@...hat.com>,
	"Arjan van de Ven\"" <arjan@...ux.intel.com>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Aeolus Yang <Aeolus.Yang@...eros.com>,
	Amod Bodas <Amod.Bodas@...eros.com>,
	David Quan <David.Quan@...eros.com>,
	Kishore Jotwani <Kishore.Jotwani@...eros.com>
Subject: Re: [PATCH] cpu-freq: add troubleshooting section for FSB changes

On Saturday 07 November 2009 09:52:56 pm Thomas Renninger wrote:
> On Friday 06 November 2009 09:01:00 pm Luis R. Rodriguez wrote:
> > With cpu frequency scaling you may run into some system
> > performance issues when the FSB changes speed due to the
> > throughput constraints this brings on the system.
>
> Interesting.
> Could you be a bit more detailed how and what kind of perfomance issues are
> seen, please.
> I expect IO based issues like WLAN package throughput or even lost
> connections :) "wireless" is also a good word to grep for...
> If this gets documented also a bit more info about the HW should get
> added. The problem sounds rather restricted to specific models (atom based,
> laptop, desktop chipsets?)?
Or whatabout adding a list of affected machine/chipset models. The ordinary
user will hardly find his IO throughput problem in:
Documentation/cpu-freq/user-guide.txt
Then a lot of people will be happy when starting to google for their HW.

     Thomas
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