linux-kernel - Re: [PATCH -rt] disconnect warp check from hrtimers

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Date:	Wed, 27 Dec 2006 09:53:30 -0800
From:	Daniel Walker <dwalker@...sta.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH -rt] disconnect warp check from hrtimers

On Wed, 2006-12-27 at 18:39 +0100, Ingo Molnar wrote:
> * Daniel Walker <dwalker@...sta.com> wrote:
> 
> > These calls were getting inconsistent wrt. the xtime_lock. The 
> > xtime_lock should be held when doing the warp check update, and 
> > interrupts should be off.
> 
> thanks, applied. Does this solve some warnings that you saw trigger?

I saw some unexplained time warping while using the source at this url,

http://www.atnf.csiro.au/people/rgooch/benchmarks/linux-scheduler.html

it was on an older 2.6.18 based -rt .. The system would print the time
warp warning, then hang .. I applied something similar to the patch I
just sent, and the time warp warning was gone but the system still hung.

New -rt version don't hang, and I don't see the warning .. However, I
suspect the time warp warning was a side effect of the hang..

The system hang was resolved by changing the irq threads to all prio
50 ..

Daniel

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