linux-kernel - Re: [patch] CFS scheduler, -v13

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Date:	Fri, 18 May 2007 16:20:27 +0100
From:	"Michael Lothian" <mike@...eburn.co.uk>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Con Kolivas" <kernel@...ivas.org>,
	"Nick Piggin" <npiggin@...e.de>, "Mike Galbraith" <efault@....de>,
	"Peter Williams" <pwil3058@...pond.net.au>,
	"Arjan van de Ven" <arjan@...radead.org>,
	"Thomas Gleixner" <tglx@...utronix.de>
Subject: Re: [patch] CFS scheduler, -v13

Just thought I'd let you know that CFS is working on the PS3


neutrino boot # dmesg
Using PS3 machine description
Page orders: linear mapping = 24, virtual = 12, io = 12
Starting Linux PPC64 #1 SMP Fri May 18 09:26:38 UTC 2007
-----------------------------------------------------
ppc64_pft_size                = 0x14
physicalMemorySize            = 0x8000000
ppc64_caches.dcache_line_size = 0x80
ppc64_caches.icache_line_size = 0x80
htab_address                  = 0x0000000000000000
htab_hash_mask                = 0x1fff
-----------------------------------------------------
Linux version 2.6.22-rc1-cfs-v13 (root@...alhost) (gcc version 4.1.1
(Gentoo 4.1.1-r3)) #1 SMP Fri May 18 09:26:38 UTC 2007

It feels more responsive but I shall do more testing and see if there
are any real benefits

On 17/05/07, Ingo Molnar <mingo@...e.hu> wrote:
>
> i'm pleased to announce release -v13 of the CFS scheduler patchset.
>
> The CFS patch against v2.6.22-rc1, v2.6.21.1 or v2.6.20.10 can be
> downloaded from the usual place:
>
>      http://people.redhat.com/mingo/cfs-scheduler/
>
> -v13 is a fixes-only release. It fixes a smaller accounting bug, so if
> you saw small lags during desktop use under certain workloads then
> please re-check that workload under -v13 too. It also tweaks SMP
> load-balancing a bit. (Note: the load-balancing artifact reported by
> Peter Williams is not a CFS-specific problem and he reproduced it in
> v2.6.21 too. Nevertheless -v13 should be less prone to such artifacts.)
>
> I know about no open CFS regression at the moment, so please re-test
> -v13 and if you still see any problem please re-report it. Thanks!
>
> Changes since -v12:
>
>  - small tweak: made the "fork flow" of reniced tasks zero-sum
>
>  - debugging update: /proc/<PID>/sched is now seqfile based and echoing
>    0 to it clears the maximum-tracking counters.
>
>  - more debugging counters
>
>  - small rounding fix to make the statistical average of rounding errors
>    zero
>
>  - scale both the runtime limit and the granularity on SMP too, and make
>    it dependent on HZ
>
>  - misc cleanups
>
> As usual, any sort of feedback, bugreport, fix and suggestion is more
> than welcome,
>
>         Ingo
> -
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