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I don't remember which IO scheduler is default on arch 26 kernel. And..I don't remember the grub args to pass to change it.
Can anyone point me to the thread, or provide me with updated info?
"Be conservative in what you send; be liberal in what you accept." -- Postel's Law
"tacos" -- Cactus' Law
"t̥͍͎̪̪͗a̴̻̩͈͚ͨc̠o̩̙͈ͫͅs͙͎̙͊ ͔͇̫̜t͎̳̀a̜̞̗ͩc̗͍͚o̲̯̿s̖̣̤̙͌ ̖̜̈ț̰̫͓ạ̪͖̳c̲͎͕̰̯̃̈o͉ͅs̪ͪ ̜̻̖̜͕" -- -̖͚̫̙̓-̺̠͇ͤ̃ ̜̪̜ͯZ͔̗̭̞ͪA̝͈̙͖̩L͉̠̺͓G̙̞̦͖O̳̗͍
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http://bbs.archlinux.org/viewtopic.php?t=8925
option is "elevator=X"... "as" is the default
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which scheduler is best for a server? cfq? deadline?
"Be conservative in what you send; be liberal in what you accept." -- Postel's Law
"tacos" -- Cactus' Law
"t̥͍͎̪̪͗a̴̻̩͈͚ͨc̠o̩̙͈ͫͅs͙͎̙͊ ͔͇̫̜t͎̳̀a̜̞̗ͩc̗͍͚o̲̯̿s̖̣̤̙͌ ̖̜̈ț̰̫͓ạ̪͖̳c̲͎͕̰̯̃̈o͉ͅs̪ͪ ̜̻̖̜͕" -- -̖͚̫̙̓-̺̠͇ͤ̃ ̜̪̜ͯZ͔̗̭̞ͪA̝͈̙͖̩L͉̠̺͓G̙̞̦͖O̳̗͍
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# cat /sys/block/hda/queue/scheduler
noop [anticipatory] deadline cfq
# echo cfq > /sys/block/hda/queue/scheduler
# cat /sys/block/hda/queue/scheduler
noop anticipatory deadline [cfq]
What's best depends on what you do. So try it out and test it I'd say.
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the current claim is that deadline is better for database applications and the like and that cfq is good for desktop use. you may not be able to tell much difference depending on usage.
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Yes, deadline has the bigest throughput, but bad latency, while cfq has good latency but lower throughput. Anticipatory should be somewhere between. Noop is when you want to kill your harddisk, or have something like a flashdisk or a very advanced raid controller where everything happens in hardware already.
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CFQ-TS (time-sliced version) with ext3 dir_index, journal_data.
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