Regarding CPU softlockup issue

Regarding CPU softlockup issue

[Pradeep Kumar]

hi all,

I got the fallowing soft lockup error

 "BUG: soft lockup - CPU#0 stuck for 16s! [Playback Thread:9266"]

is that 16s is the value of /proc/sys/kernel/softlockup_thresh ??

if yes, can I get rid of that message/panic by setting softlockup_thresh to
some value greater that 30 ???

-- 
Goudagunta Pradeep Kumar,
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Fwd: Regarding CPU softlockup issue

[Pradeep Kumar]

hi all,

I got the fallowing soft lockup error

 "BUG: soft lockup - CPU#0 stuck for 16s! [Playback Thread:9266"]

is that 16s is the value of /proc/sys/kernel/softlockup_thresh ??

if yes, can I get rid of that message/panic by setting softlockup_thresh to
some value greater that 30 ???

-- 
Goudagunta Pradeep Kumar,
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Regarding CPU softlockup issue

[Mulyadi Santosa]

On Tue, Dec 28, 2010 at 17:30, Pradeep Kumar <pradeepkernel@gmail.com> wrote:
> hi all,
>
> I got the fallowing soft lockup error
> ?"BUG: soft lockup - CPU#0 stuck for 16s! [Playback Thread:9266"]
> is that 16s is the value of?/proc/sys/kernel/softlockup_thresh ??
> if yes, can I get rid of that message/panic by setting softlockup_thresh to
> some value greater that 30 ???


Quite likely, yes....AFAIK, it was 10 second last time I saw that kind
of message.

But are you sure you wanna let your CPU get locked for that long? I
think something is wrong if CPU is getting locked even for 10 second.
Better find a way to solve the problem.

-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com

Regarding CPU softlockup issue

[Manish Katiyar]

On Tue, Dec 28, 2010 at 2:30 AM, Pradeep Kumar <pradeepkernel@gmail.com> wrote:
> hi all,
>
> I got the fallowing soft lockup error
> ?"BUG: soft lockup - CPU#0 stuck for 16s! [Playback Thread:9266"]
> is that 16s is the value of?/proc/sys/kernel/softlockup_thresh ??

Not really . In loose terms, 16s is the value of difference in time
when this process was last touched by this cpu.


> if yes, can I get rid of that message/panic by setting softlockup_thresh to
> some value greater that 30 ???

You can set it to 0 or something less than 0 to avoid these triggers.

See the function softlockup_tick() to see how the calculations are
made to trigger soft lockups. Roughly the calculation is :-

if "current_time - threshold" > "last time touched timestamp"
    trigger soft lockup.


HTH


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-- 
Thanks -
Manish
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