06.06.2009

Linux-Kernel: CFQ-Scheduling and ionice...

Everyone, who uses computers, has experienced a hanging system. Sometimes this is due to high cpu usage, but often it is due to i/o contention.
Now with Linux 2.6 kernels there is this parameter "elevator":
elevator= [IOSCHED]
Format: {"anticipatory" | "cfq" | "deadline" | "noop"}
See Documentation/block/as-iosched.txt and
Documentation/block/deadline-iosched.txt for details.
Choosing CFQ solve this problem, if you aware of ionice. With ionice i/o can be prioritized using classes.
For example:
ionice -c3 myprogram
The only problem is, that ps or top does not support this ionice parameter. So you have to ask for each process the ioniceness via ionice -p PID:
$ ionice -p 6344
none: prio 0

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