linux-kernel - Re: [patch] CFS scheduler, -v17

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Date:	Fri, 22 Jun 2007 08:36:08 +0100
From:	"Tom Spink" <tspink@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Mike Galbraith" <efault@....de>,
	"Arjan van de Ven" <arjan@...radead.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Balbir Singh" <balbir@...ux.vnet.ibm.com>,
	"Dmitry Adamushko" <dmitry.adamushko@...il.com>,
	"Srivatsa Vaddagiri" <vatsa@...ux.vnet.ibm.com>
Subject: Re: [patch] CFS scheduler, -v17

On 14/06/07, Ingo Molnar <mingo@...e.hu> wrote:
>
> i'm pleased to announce release -v17 of the CFS scheduler patchset.
>
> The rolled-up CFS patch against v2.6.22-rc4, v2.6.22-rc4-mm2, v2.6.21.5
> or v2.6.20.13 can be downloaded from the usual place:
>
>    http://people.redhat.com/mingo/cfs-scheduler/
>
> -v17 includes a bigger change: the CFS-core changes in preparation of
> the group-scheduling feature, written Srivatsa Vaddagiri. Dmitry
> Adamushko provided cleanups and further generalizations to this code and
> the modularization of CFS has been further enhanced as a result. To
> users, these changes are mostly invisible.
>
> Changes since -v16:
>
>  - lots of core updates to support group scheduling, and related
>    cleanups. (Srivatsa Vaddagiri, Dmitry Adamushko)
>
>  - tuned the runtime-limit up a bit, based on relentless testing done by
>    Tobias Gerschner.
>
>  - the new, precise load-calculation method for SMP balancing has been
>    further enhanced, and is now active by default. (Dmitry Adamushko)
>
>  - fix SCHED_IDLEPRIO support (based on feedback from Thomas Sattler)
>
>  - further updates to /proc/sched_debug and /proc/PID/sched
>
>  - more cleanups
>
> As usual, any sort of feedback, bugreport, fix and suggestion is more
> than welcome!
>
>         Ingo
> -
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>

Hi everyone,

I'm just writing to say how impressed I am with the new CFS scheduler.
 I've been following it's development from the first patch, right up
to now (running on the latest vanilla kernel I could!) and I can
honestly say I've never had such a responsive experience.

I'm currently writing a major patch to the ext2 file-system driver, as
part of a University project - it involves a lot of kernel rebuilds as
I'm testing the patch in UML.  I've had a couple of kernel compiles
happening simultaneously (on my moderate single CPU PC), and tried out
a few make -j12's, and I'm amazed at the difference the new scheduler
makes.

I've got quite a few instances of Firefox (whoops, Iceweasel) open,
I'm listening to music and theres a few other apps running (like KNode
the newsreader) and the interactivity response has been excellent.

In conclusion, well done to the scheduler people and I look forward to
seeing this go to mainline.

(If there's anything I can do to help, I'd love to throw a few patches
at the mailing list ;)

-- 
Regards,
Tom Spink
University of Edinburgh
-
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