linux-kernel - Re: [1/6] 2.6.21-rc4: known regressions

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Date:	Fri, 23 Mar 2007 13:27:39 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Mingming Cao <cmm@...ibm.com>, Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	Mariusz Kozlowski <m.kozlowski@...land.pl>,
	Oliver Pinter <oliver.pntr@...il.com>,
	Sid Boyce <g3vbv@...eyonder.co.uk>,
	Nick Piggin <npiggin@...e.de>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [1/6] 2.6.21-rc4: known regressions


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> [ Ok, I think it's those timers again...

agreed - this seems to be a genuine CONFIG_HIGH_RES_TIMERS=y bug. (which 
has probably not been fixed since -rc4 either, we have no bugfix in this 
area that could explain the expires_next==KTIME_MAX timer state visible 
in SysRq-Q.)

there seems to be a trend in the reports: HT P4 CPUs.

>   Ingo: let me just state how *happy* I am that I told you off when 
>   you wanted to merge the hires timers and NO_HZ before 2.6.20 because 
>   they were "stable". You were wrong, and 2.6.20 is at least in 
>   reasonable shape. [...]

yes - i was quite wrong pushing it so hard. (and doubly so given your 
stated focus of making v2.6.20 a quiet release) Sorry :-/

> [...] Now we just need to make sure that 2.6.21 will be too.. ]

yeah - we are working hard on it.

	Ingo
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