On Wed, 20 Mar 2013 16:05:09 -0700, Arlie Stephens said: > The ongoing thread reminds me of a simple question I've had since I > first read about linux' mutiple I/O schedulers. Why is the choice of > I/O scheduler global to the whole kernel, rather than per-device or > similar?
They aren't global to the kernel. On my laptop: # find /sys/devices/pci* -name 'scheduler' | xargs grep . /sys/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/block/sda/queue/scheduler:noop deadline [cfq] /sys/devices/pci0000:00/0000:00:1f.2/ata2/host1/target1:0:0/1:0:0:0/block/sr0/queue/scheduler:noop deadline [cfq] # echo noop >| /sys/devices/pci0000:00/0000:00:1f.2/ata2/host1/target1:0:0/1:0:0:0/block/sr0/queue/schedule # find /sys/devices/pci* -name 'scheduler' | xargs grep . /sys/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/block/sda/queue/scheduler:noop deadline [cfq] /sys/devices/pci0000:00/0000:00:1f.2/ata2/host1/target1:0:0/1:0:0:0/block/sr0/queue/scheduler:[noop] deadline cfq I just changed the scheduler for the CD-ROM.
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