linux-kernel - Re: [announce] Intel announces the PowerTOP utility for Linux

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Message-Id: <200705122212.43653.s0348365@sms.ed.ac.uk>
Date:	Sat, 12 May 2007 22:12:43 +0100
From:	Alistair John Strachan <s0348365@....ed.ac.uk>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org
Subject: Re: [announce] Intel announces the PowerTOP utility for Linux

On Saturday 12 May 2007 00:07:18 Arjan van de Ven wrote:
> What's eating the battery life of my laptop? Why isn't it many more
> hours? Which software component causes the most power to be burned?
> These are important questions without a good answer... until now.

This is a really great tool and presents a very intuitive alternative to the 
timer stats file..

On a Core 2 Duo Macbook, Linux always gets around 3.2h battery, OS X about 
4.2h. This tool has identified that uhci_hcd is where 75% of the ticks are 
going when X is not loaded. Unloading uhci_hcd drops the battery life back to 
around 4.2h, but I lose the keyboard.

Is there any way to find out what USB driver is causing usb_uhci to be this 
busy?

(BTW, the link to Keith's patch for dhcdbd seems to be broken on your 
homepage.)

-- 
Cheers,
Alistair.

Final year Computer Science undergraduate.
1F2 55 South Clerk Street, Edinburgh, UK.
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