On Wed, 2009-04-08 at 10:37 -0400, Greg Freemyer wrote:
> I think the only way to switch schedulers is to reboot. You invoke
> the noop scheduler via a command line arg to the kernel at boot time.
This can be done at any time, no reboot required:
for f in /sys/block/*/queue/scheduler; do
echo noop > $f
echo $f "$(cat $f)"
done
Just FYI, I don't think ionice and friends will work when using noop.
Leslie: I still think finding out what the kernel is doing during the
stall would be a HUGE hint to the problem. Did you look into oprofile or
ftrace?
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