linux-kernel - Re: 2.6.25-rc7-git2: Reported regressions from 2.6.24

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Date:	Fri, 28 Mar 2008 21:42:56 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Adrian Bunk <bunk@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Natalie Protasevich <protasnb@...il.com>
Subject: Re: 2.6.25-rc7-git2: Reported regressions from 2.6.24

> Subject		: 2.6.24-git15 Keyboard Issue?

Rafael, we can close this bug i think. The group scheduler related 
interactivity problems in early .25-rc were resolved via:

| commit 62fb185130e4d420f71a30ff59d8b16b74ef5d2b
| Author: Peter Zijlstra <a.p.zijlstra@...llo.nl>
| Date:   Mon Feb 25 17:34:02 2008 +0100
|
|     sched: revert load_balance_monitor() changes
[...]
|    Namely:
|     - very frequent wakeups on SMP, reported by PowerTop users.
|     - cacheline trashing on (large) SMP
|     - some latencies larger than 500ms

that includes Xorg's fragility to certain types of delays. It should be 
resolved by now and i havent seen it resurface.

we are now back to the 2.6.24 state of things. Which isnt as perfectly 
interactive as the non-group-scheduler 2.6.24, but which is still more 
interactive than say 2.6.22.

Peter is working on improving it even more, but that's 2.6.26 material.

	Ingo
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