linux-kernel - Re: soft lockup - CPU#1 stuck for 15s! [swapper:0]

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Date:	Sat, 8 Dec 2007 11:00:47 -0500
From:	"Parag Warudkar" <parag.warudkar@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Thomas Gleixner" <tglx@...utronix.de>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>
Subject: Re: soft lockup - CPU#1 stuck for 15s! [swapper:0]

On Dec 8, 2007 10:47 AM, Ingo Molnar <mingo@...e.hu> wrote:
>
> does the patch below help? But the root cause is likely some timer
> problems - do you get consistent results from:
>

Haven't yet tried the patch - will try a little later.

>    while :; do time usleep 1111111; done
>
> or do these sleeps fluctuate?
>

They seem to fluctuate - not sure if that's supposed to be exact or if
below variations are normal -
This is when my compiles are running -

[parag@...i ~]$ while :; do time usleep 1111111; done

real    0m1.116s
user    0m0.000s
sys     0m0.000s

real    0m1.112s
user    0m0.000s
sys     0m0.000s

real    0m1.130s
user    0m0.000s
sys     0m0.004s

real    0m1.144s
user    0m0.000s
sys     0m0.000s


Thanks
Parag
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