kernel scheduler
 

I use a ramdisk. I would like to set scheduler elevator=noop for the ramdisk but I want to use another scheduler for the hard disks.
I can't understand if it is possible and how to do
Thank You

Please correct my English because I'm Italian

As far as I read /usr/src/kernels/${KERNELVERSION}/Documentation/scheduler/ only one scheduler can be selected and it only "works" on CPU's/groups/cgroups.

That's actually not a scheduler, but an io-scheduler. Slightly
different beast.

Yes, it can.
Assuming you have sysfs enabled, with SCHEDNAME="your scheduler of
choice" and DEV is the name of the device you want to set an IO-
Scheduler for:
echo SCHEDNAME > /sys/block/DEV/queue/scheduler


Your English is ultimately superior to my Italian ;}

In the second block you'd use whether instead of if.


Ciao,
Tink

Awesome. Learnt something new. Thanks Tink.

there is no queue/scheduler entry in /sys/block/ram0/

Goes to show I never looked at ram-disks, huh. I'd need to
start digging through kernel-doco to see WHY ram (and loop,
for that matter) devices don't have I/O schedulers attached.

But I guess you're out of luck with elevator and RAM disks
then. Sorry mate.

I'm still curious - what are you trying to do with that RAM
disk, and why the need for a different scheduler?



Cheers,
Tink

A different scheduler (=a direct io scheduler) reduce power consumption in ram and it is faster
I use 2gb ram disk for torrent