linux-kernel - Re: [RFC][PATCH 2/2] ACPI: handle timer ticks proactively

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Date:	Wed, 6 Sep 2006 12:54:15 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Adam Belay <abelay@...ell.com>
Cc:	len.brown@...el.com, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux@...inikbrodowski.net,
	arjan@...ux.intel.com
Subject: Re: [RFC][PATCH 2/2] ACPI: handle timer ticks proactively

Hi!

> > > Okay, just to get you some feedback:
> > > 
> > > It seems to change things a _lot_. Power consumption with usb modules
> > > loaded went from 14315mW to 13800mW -- that is huge
> > > deal. Unfortunately something strange is going on: with stock kernel,
> > > power consumption is mostly constant. With your patch, it varies a
> > > lot, at 2 second timescale.
> > > 
> > > Power consumption with usb unloaded (only way to get reasonable power
> > > on x60) went from stable 10450mW to  something rapidly changing, and
> > > probably even worse than original:
> > 
> > I also noticed that with your patch, bus master activity tends to be constant?!
> 
> Is this the case even when userspace touches the disk?  On my hardware I
> see a constant flow of short BM activity bursts.

Disk was active (like once 5 seconds some small access)...
									Pavel
-- 
Thanks, Sharp!
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