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Date: Mon, 13 Jun 2005 08:25:07 -0700
From: Tony Lindgren <tony@atomide.com>
To: Valdis.Kletnieks@vt.edu
Cc: linux-kernel@vger.kernel.org,
       "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>,
       Jonathan Corbet <corbet@lwn.net>, Pavel Machek <pavel@ucw.cz>,
       Bernard Blackham <b-lkml@blackham.com.au>,
       Christian Hesse <mail@earthworm.de>,
       Zwane Mwaikambo <zwane@arm.linux.org.uk>,
       Thomas Renninger <trenn@suse.de>
Subject: Re: [PATCH] Dynamic tick for x86 version 050609-2
Message-ID: <20050613152507.GB7862@atomide.com>
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* Valdis.Kletnieks@vt.edu <Valdis.Kletnieks@vt.edu> [050612 21:55]:
> On Thu, 09 Jun 2005 21:30:18 PDT, Tony Lindgren said:
> 
> > Thanks for all the comments. Here's an updated dyntick patch.
> 
> Patches with 3 minor rejects against -rc6-mm1, boots, and seems to work well on
> my Dell Latitude C840 laptop - although running at full load with seti@home
> causes the expected 250 timer ticks/sec, running a mostly-idle  X session only
> gets about 117, and having xmms and a few other things running it hits about
> 170 tics/sec. I've had the CPU speed bounce between 1.2G and 1.6G a few times
> and it didn't seem to blink either. Even NTP is happy with what it sees.. ;)

Cool.

> Need to rebuild with CONFIG_HZ=1000 and see what it does, and see what it does
> to actual power consumption.

You may also want to check out the patch by Thomas Renninger for ACPI
C-states. I've added a link to it at:

http://muru.com/dyntick/

> Minor nit:  The implementation of /sys/devices/system/timer/timer0/dyn_tick_state
> violates the one-value-per-file rule for sysfs.  I suspect this needs to
> become a directory with 3-4 files in it, each containing one value.

Yeah, I'll clean up that for the next version.

Tony