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Missing NOOP scheduler in 5.x kernels
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ununu
n00b
n00b


Joined: 19 Apr 2020
Posts: 31

PostPosted: Tue May 12, 2020 10:41 am    Post subject: Missing NOOP scheduler in 5.x kernels Reply with quote

Greets,

After a new kernel upgrade I was undecided which scheduler to use so I sort of skipped over the options. Before I always used NOOP.

So after looking online how to check this on this article it shows the following:

Code:
cat /sys/block/sda/queue/scheduler
noop [deadline] cfq


Yet on my machine it shows:

Code:
cat /sys/block/sda/queue/scheduler
[none]


Which is somewhat puzzling, I thought a scheduler was vital for a running system, what's more BFS used to be the default.

Now I am reluctant to set NOOP:

Code:
echo noop /sys/block/sda/queue/scheduler


since the system appears to work fine even while running some emulators.

Is this a source of concern? What happened to NOOP? Which one is the equivalent of NOOP in 5.x kernels?

thanks in advance.
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Ionen
l33t
l33t


Joined: 06 Dec 2018
Posts: 697

PostPosted: Tue May 12, 2020 10:52 am    Post subject: Reply with quote

Block device type changed to multiqueue (mq) which has different implementations, current choices available without patches (if enabled in kernel, seems you have them disabled) are none, bfq, mq-deadline, and kyber. Look them up if don't know what to use for your workload/hardware, others will explain better. But [none] is essentially noop (no operations), so maybe what you want assuming aware of what it means if i/o usage gets maxed for long period even on nvme ssds. Edit: like I couldn't even open a man page until over :)
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