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kernelOfTruth
Watchman
Joined: 20 Dec 2005
Posts: 6111
Location: Vienna, Austria; Germany; hello world :)
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 Posted: Fri Feb 08, 2008 9:32 pm Post subject: Laptop/Workstation, battery-runtime/throughput Goodness |
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Hi there,
I collected together some settings for the VFS & harddrive-tweaking,
could you please test it & say if it improves battery runtime for you / improves throughput during data copying
(I've taken some of those from ubuntuforums, wikis, and several other places: kudos to all of your "tuners" out there 
/proc/sys/vm/mapped <-- is the opposite of /proc/sys/vm/swappiness == mapped -> 100-swapped (ck-patchset / zen-sources specific)
# enhancing battery runtime (you may need to run sync manually for data safety's sake)
| Code: | #!/bin/bash
# Tweak virtual memory to conserve power when running on batteries.
echo 100 > /proc/sys/vm/mapped
echo 0 > /proc/sys/vm/dirty_expire_centisecs
echo 0 > /proc/sys/vm/dirty_writeback_centisecs
echo 60 > /proc/sys/vm/dirty_background_ratio
echo 95 > /proc/sys/vm/dirty_ratio
echo 40 > /proc/sys/vm/vfs_cache_pressure
for i in /sys/class/scsi_host/host*; do
/bin/echo "min_power" > $i/link_power_management_policy
done
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# optimizing vfs for desktop/server-performance:
| Code: | #!/bin/bash
# Tweak virtual memory for running on AC.
echo 66 > /proc/sys/vm/mapped
echo 3000 > /proc/sys/vm/dirty_expire_centisecs
echo 3000 > /proc/sys/vm/dirty_writeback_centisecs
echo 10 > /proc/sys/vm/dirty_background_ratio
echo 95 > /proc/sys/vm/dirty_ratio
echo 100000 > /proc/sys/vm/vfs_cache_pressure
for i in /sys/class/scsi_host/host*; do
/bin/echo "max_power" > $i/link_power_management_policy
done
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# general tweaking:
| Code: | for i in /sys/block/sd*; do
/bin/echo "256" > $i/queue/read_ahead_kb
done
for i in /sys/block/sd*; do
/bin/echo "anticipatory" > $i/queue/scheduler
done
## seems to be set dynamically, at least for me
#for i in /sys/block/sd*; do
# /bin/echo "256" > $i/queue/nr_requests
# done
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best results are achieved with zen-sources and reiser4 + cryptcompress (lzo1) ( | Code: | | mkfs.reiser4 -o create=ccreg40,compress=lzo1 /dev/foo |
)
Thanks in advance for your feedback
this post will be updated to reflect the changes in performance I experience.
I'll also add the addresses I stumble upon so that you can put together your ultimate tweaking / performance settings.
please share those with the community and post them here 
Thanks in advance
References / Links:
throughput:
Extreme Linux Performance Monitoring and Tuning 1.0 Tuning ...
Reduced Power Usage (wiki.ubuntu.com)
Intel G33, Q35 and Q33 Chipsets
kernel tuning
lrz Munich (linux computing center Munich)
linux ata faq
searchenterpriselinux.techtarget.com tip
raid optimization
responsiveness:
Tales from responsivenessland: why Linux feels slow, and how to fix that
_________________
https://github.com/kernelOfTruth/ZFS-for-SystemRescueCD/tree/ZFS-for-SysRescCD-4.9.0
https://github.com/kernelOfTruth/pulseaudio-equalizer-ladspa
Hardcore Gentoo Linux user since 2004 
Last edited by kernelOfTruth on Sun Feb 17, 2008 10:23 am; edited 7 times in total |
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Dottout
l33t
Joined: 07 Mar 2006
Posts: 882
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| Posted: Sat Feb 09, 2008 6:41 pm Post subject: |
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edit: sorry, I posted here by mistake, I was dealing with too many firefox tabs so, I moved my patch to the right 3d
Last edited by Dottout on Sun Feb 10, 2008 7:41 pm; edited 1 time in total |
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kernelOfTruth
Watchman
Joined: 20 Dec 2005
Posts: 6111
Location: Vienna, Austria; Germany; hello world :)
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kernelOfTruth
Watchman
Joined: 20 Dec 2005
Posts: 6111
Location: Vienna, Austria; Germany; hello world :)
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kernelOfTruth
Watchman
Joined: 20 Dec 2005
Posts: 6111
Location: Vienna, Austria; Germany; hello world :)
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micr0c0sm
Tux's lil' helper
Joined: 29 Oct 2005
Posts: 148
Location: New York
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| Posted: Wed Feb 20, 2008 2:34 am Post subject: |
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| I would be more apt to mess around if you were idling some irc channel and/or could explain how to bench these. |
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