IO Scheduler to use for HDD and SSD

jiewmeng · 2012-10-19 12:10:54

From what I read on Arch Wiki and Wikipedia about schedulers, it seems NOOP is recommended for SSD's because:

NOOP scheduler is best used with solid state devices such as flash memory or in general with devices that do not depend on mechanical movement to access data (meaning typical "hard disk" drive technology consisting of seek time primarily, plus rotational latency). Such non-mechanical devices do not require re-ordering of multiple I/O requests, a technique that groups together I/O requests that are physically close together on the disk, thereby reducing average seek time and the variability of I/O service time

But for normal HDD's (wo RAID) its not so clear, can I say Deadline will be suggested as it enforces a deadline thus "minimum performance"? Or keep with the default CFQ?

Meyithi · 2012-10-19 12:25:41

http://www.danielscottlawrence.com/shou … or-my-ssd/

You'll get a tiny benefit switching to noop - but cfq detects and does all of the right things on non rotational disks nowadays so I just leave it as it.

boast · 2012-10-19 14:11:01

I would stay with CFQ

heres more benchmarks: http://www.phoronix.com/scan.php?page=a … 2012&num=2

Arch Linux

#1 2012-10-19 12:10:54

IO Scheduler to use for HDD and SSD

#2 2012-10-19 12:25:41

Re: IO Scheduler to use for HDD and SSD

#3 2012-10-19 14:11:01

Re: IO Scheduler to use for HDD and SSD

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