Linked by Thom Holwerda on Tue 12th Feb 2013 23:26 UTC, submitted by cloud
Linux "Several changes, some bugfixes and a major testing effort bring me to release a new version of the SCHED_DEADLINE patchset (v7). In addition, given the fact that the project has been around for quite some time with always a positive feedback from the community and since we have reached a stable and tested set of functionalities, I think it is time to remove the RFC tag."
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And SCHED_DEADLINE is...
by Nth_Man on Tue 12th Feb 2013 23:58 UTC
Nth_Man
Member since:
2010-05-16

A little more information about SCHED_DEADLINE:

"SCHED_DEADLINE is a new deadline-based real-time task scheduling policy for the Linux kernel with bandwidth isolation (aka "resource reservation") capabilities. It supports global/clustered multiprocessor scheduling through dynamic task migrations.

The scheduling class implements the real-time scheduling algorithm called Earliest Deadline First (EDF), one of the most common real-time scheduling algorithms."
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Edited 2013-02-13 00:07 UTC

Reply Score: 6

how is this used?
by project_2501 on Wed 13th Feb 2013 18:25 UTC
project_2501
Member since:
2006-03-20

Would be interested to know who and how this is used?

Reply Score: 2

RE: how is this used?
by foobaz on Thu 14th Feb 2013 04:10 UTC in reply to "how is this used?"
foobaz Member since:
2009-12-05

It is a better scheduler for server loads than Linux's default, the Completely Fair Scheduler. Deadline allows more parallelism, so more cores can be doing IO without having to wait for each other. It works especially well with XFS, which is also designed for highly parallel loads.

It has other benefits too but this is why I use it.

Reply Score: 2

RE[2]: how is this used?
by phoenix on Fri 15th Feb 2013 18:57 UTC in reply to "RE: how is this used?"
phoenix Member since:
2005-07-11

I think you are confusing I/O schedulers and process schedulers.

SCHED_DEADLINE is a process scheduler, for scheduling processes to run on CPUs.

The "deadline" scheduler you are talking about is the I/O scheduler which determines which processes can do I/O to the storage system.

Very different things!

Reply Score: 3

patchset?
by SeeM on Wed 13th Feb 2013 18:28 UTC
SeeM
Member since:
2011-09-10

It's been awhile since I heard of any patchset on more then less mainstream news.

Does anyone using one of these on purpose? I mean not because kernel packages comes with one or more preinstaled. The last one that I used was lck.

Reply Score: 1