[dundee] laptop mode power saving

[Lee Hughes]

i don't like it, it's to retro for me.. i like things like a compiler n stuff.

--- On Sun, 25/10/09, paul lancaster <paul_lancaster at blueyonder.co.uk> wrote:

From: paul lancaster <paul_lancaster at blueyonder.co.uk>
Subject: Re: [dundee] laptop mode power saving
To: "Tayside Linux User Group" <dundee at lists.lug.org.uk>
Date: Sunday, 25 October, 2009, 12:46 PM



 
 

Try Puppy linux it works from ram - remove the HDD, 
boot from usb :)
 
Paul

  ----- Original Message ----- 
  From: 
  Lee 
  Hughes 
  To: Tayside Linux User Group 
  Sent: Sunday, October 18, 2009 2:06 
  PM
  Subject: [dundee] laptop mode power 
  saving
  

  
    
    
      Right,

has any got laptop mode working 
        successfully , i'm trying to get my hard disk to spin down as long as 
        possible, 

i've been using a combination of lm-profile, iotop -o 
        -d 10 -b

now,  i've nailed fire fox from fsyncing all the 
        time, that's improved things some what,
http://www.dslreports.com/forum/r23159573-Re-Make-Firefox-3x-more-responsive-with-a-simple-trick

it's 
        also faster too boot!

however,  my hard disk sleeps for 
        about 2mins, i've zapped syslog and klog for testing,
so there should 
        be nothing on the system that should need to wake the disk for 
        writing.

however, kkjournald is waking the disk up, (presumable 
        to write the journal to disk)
but the file system is mounted with 
        

/dev/sda1 on / type ext3 
        (rw,relatime,errors=remount-ro,commit=600)

so, it should only 
        commit every 10 mins, or when we run low on memory.

  PID 
        USER      DISK READ  DISK 
        WRITE   SWAPIN    IO    
        COMMAND
  807 
        root           0 
        B/s    5.54 K/s  0.00 %  0.00 % 
        [kjournald]
 3911 
        user           0 
        B/s    0.40 K/s  0.00 %  0.00 % 
        gnome-power-manager


oh,actually i wonder  if it's the 
        gnome power manager, how ironic.. looks like
the gnome power manager 
        might be forcing a sync...

yes, it seems that a lot of gnome 
        componets are doing a fsync, thus waking my disk
up.. :-(

all 
        i want is, while i'm not reading new data(i.e uncached data from disk) , 
        i want
applications to write (but delay that write until I say, or a 
        timeout value).

i think over use of the fsync call may be answer, 
        but i think there's more to it than that.

my harddrives now been 
        dormant for 10mins....  spin down nirvarna has been 
        reached.

looks like killing the gnome power meter has stopped the 
        spin ups... now that's
ironic..  any replacements? or shall i go 
        and hack it.

i wonder if this would do ssd's good 
        too.

thoughts?

Cheers,

Lee












  
  

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