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= Service Run-level Changes =
= Image Creation =
* Overlay size
* Swap size
* Home size


What system daemons are started that aren't needed? For example, bluetooth ... there is no bluetooth hardware on the XO.
Should we be resizing the filesystem image with resize2fs to make more space for things like /home?


= GNOME Desktop Session Changes =


= Kernel tunables? =
= XO Memory =
* I haven't actually tried this yet, but should look at /proc/sys/vm/swappiness which defaults to 60.  Setting to 0 might be best to do as little pre-emptive swapping as possible.
* We have 256 megabytes
* What can we turn off to give running applications more memory?


: There is no swap on the XO's default Fedora build.  One can install compcache to use compressed swap-on-RAM, and in that case setting swappiness *higher* might be better. [[User:Mtd|mtd]] 19:38, 16 October 2008 (UTC)


= Packaging Changes =
= Service Run-level Changes =
* What services can we disable
* Which services slow boot time
* Which services use extra resources


Replace firefox with something more light weight?


Looks like epiphany might save a little memory:
= GNOME Desktop Session Changes =
* What can we do to GNOME to reduce its footprint


  USER      PID %CPU %MEM    VSZ  RSS TTY      STAT START  TIME COMMAND
  liveuser  3678  0.1  0.5  4804  1264 ?        S    11:08  0:00 /bin/sh /usr/lib/firefox-3.0.2/run-mozilla.sh /usr/lib/firefox-3.0.2/firefox
  liveuser  3695 31.5 18.5 162356 43436 ?        Sl  11:08  0:34 /usr/lib/firefox-3.0.2/firefox


versus
= Kernel tunables =
 
* I haven't actually tried this yet, but should look at /proc/sys/vm/swappiness which defaults to 60. Setting to 0 might be best to do as little pre-emptive swapping as possible.
  USER      PID %CPU %MEM    VSZ  RSS TTY      STAT START  TIME COMMAND
  liveuser 3740 18.5 15.9 148828 37216 ?        Sl  11:11  0:10 epiphany
 
= Image Generation =
 
== Overlay Storage ==


Using the ''--overlay-size-mb'' parameter to the ''livecd-iso-to-disk'' script is recommended for 2 reasons.
# Any changes to your live image are saved to the SD card (instead of memory).  These changes will remain upon reboot.
# It improves performance because there ends up being less memory pressure.


A potential drawback might be that more writes are happening to your SD media, which may lower the life expectancy of the SD media.
= Application tunables =
* What applications do we need to pay particular attention to


== Swap space? ==


If you need to add swap after booting your XO, I've been using the following commands:
== Firefox ==
* File cache
* Memory footprint


  # mount /dev/live /mnt/live
  # dd if=/dev/zero of=/mnt/live/swap.img bs=1024 count=256000
  # mkswap /mnt/live/swap.img
  # swapon /mnt/live/swap.img
[[Category:XO]]
[[Category:XO]]

Revision as of 21:30, 28 October 2008

The XO is a low resource environment. There isn't much room to spare for extra memory or compute cycles. This page will be used to identify applications, services, packaging, and kernel tunables that can be modified to improve XO system performance.

Activities include:

  • Identifying/testing various service configuration settings
  • Making recommendations for Live CD spin kickstart changes to reflect findings
  • Kernel tunables?
  • Recommended SD installation options?
  • Recommended boot-time options?
  • Improved desktop performance?


Image Creation

  • Overlay size
  • Swap size
  • Home size

Should we be resizing the filesystem image with resize2fs to make more space for things like /home?


XO Memory

  • We have 256 megabytes
  • What can we turn off to give running applications more memory?


Service Run-level Changes

  • What services can we disable
  • Which services slow boot time
  • Which services use extra resources


GNOME Desktop Session Changes

  • What can we do to GNOME to reduce its footprint


Kernel tunables

  • I haven't actually tried this yet, but should look at /proc/sys/vm/swappiness which defaults to 60. Setting to 0 might be best to do as little pre-emptive swapping as possible.


Application tunables

  • What applications do we need to pay particular attention to


Firefox

  • File cache
  • Memory footprint
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