Re: Regarding Kirkwood cpu support

2009-03-26 Thread Björn Wetterbom 
I'd love to help out to the best of my abilities. Please tell me how.

2009/3/25 Wouter Verhelst wou...@debian.org:
 On Wed, Mar 25, 2009 at 04:56:37PM +0100, Björn Wetterbom wrote:
 What kind of time frames are we talking about when it comes to Debian
 support for Kirkwood for us ordinary users who don't compile our own
 kernels and want our machine to start every day, every time?

 Will initial support consist of install packages from Martin or
 others, and official Debian support be available only in Debian
 Squeeze?

 That's what it looks like for now.

 The reason I am asking is that I am thinking Should I buy a
 SheevaPlug now or wait a couple of months?

 I'd suggest the latter, unless you want to help out -- there are ways to
 do that, even if you don't know how to write code.

 --
 Lo-lan-do Home is where you have to wash the dishes.
  -- #debian-devel, Freenode, 2004-09-22



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Re: SheevaPlug power usage

2009-03-26 Thread Laurent GUERBY 
On Tue, 2009-03-17 at 11:17 +0100, Laurent GUERBY wrote:
 On Mon, 2009-03-16 at 20:42 +0100, Martin Michlmayr wrote:
  * Rainer Dorsch rdor...@web.de [2009-03-16 20:00]:
   just seen your SheevaPlug blog entry
   http://www.cyrius.com/journal/debian/kirkwood/sheevaplug/nslu2-killer
   
   Do you have meassured power consumption numbers for the SheevaPlug vs 
   nslu2?
  
  No, unfortunately I don't have the equipment to measure power
  consumption.
 
 Here is what I measured with an Energy Monitor 3000, SheevaPlug on 220V:
 
 3.1W just on, Linux booted
 3.3W serial
 4.3W serial + ethernet
 6.0W serial + ethernet + USB HDD
 7.0W serial + ethernet + USB HDD + 100% cpu
 
 cos phi moves from 0.46 to 0.51. USB HDD is Lacie Porshe 120GB IDE with
 disk SAMSUNG HM120JC version YL10, I use it for swap, root is on NFS.

Hi,

Thanks to two new patches queued for git://git.marvell.com/orion.git
idle consumption is significantly improved in my setup:

2.3W Idle with everything unpluged 
3.3W Idle with gigabit ethernet
5.0W Idle with gigabit+HDD USB+serial
7.0W +100% cpu

cos phi is in the 0.5 range.

When cpu is loaded but not completely the power usage should also
be lower but it's harder to measure in my setup.

powertop 1.11 report on a mostly idle system:

Cn   Avg residency
C0 (cpu running)( 0.0%)
C09.8ms ( 0.5%)
C1  402.7ms (99.6%)

Kernel config options to enable:

CONFIG_NO_HZ=y
CONFIG_TIMER_STATS=y
CONFIG_CPU_IDLE=y
CONFIG_CPU_IDLE_GOV_LADDER=y
CONFIG_CPU_IDLE_GOV_MENU=y

Also on the performance front: a native kernel compile from scratch with
Gentoo 4.1.2 p1.3 GCC takes around 50 minutes.

Sincerely,

Laurent




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