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Date: Fri, 23 Mar 2007 13:27:39 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
       Thomas Gleixner <tglx@linutronix.de>,
       Nick Piggin <nickpiggin@yahoo.com.au>, Mingming Cao <cmm@us.ibm.com>,
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       Oliver Pinter <oliver.pntr@gmail.com>,
       Sid Boyce <g3vbv@blueyonder.co.uk>, Nick Piggin <npiggin@suse.de>,
       Jens Axboe <jens.axboe@oracle.com>
Subject: Re: [1/6] 2.6.21-rc4: known regressions
Message-ID: <20070323122739.GA5178@elte.hu>
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* Linus Torvalds <torvalds@linux-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