* 2.6.26.6-rt11 nanosleep() does have accurate behavior
@ 2008-11-07 15:56 Gautam Thaker
2008-11-07 19:17 ` Leon Woestenberg
0 siblings, 1 reply; 2+ messages in thread
From: Gautam Thaker @ 2008-11-07 15:56 UTC (permalink / raw)
To: linux-rt-users; +Cc: Gautam H. Thaker - LM ATL
I recently started to study how nanosleep() behaves under 2.6.26.6-rt11 compiled in in FULL PREEMPT, uniprocessor mode.
I find that between 2.6.20-rt8 and this new kernel something has changed and nanosleep() is back to its old behavior
or sleeping for next higher number of msec rather than carefully following the "y=x" line.
I don't follow the RT world closely enough, but is this a regression or an expected change in behavior? The link below
show the results very clearly.
http://www.atl.external.lmco.com/projects/QoS/documents/nanosleep_1.png
Gautam
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: 2.6.26.6-rt11 nanosleep() does have accurate behavior
2008-11-07 15:56 2.6.26.6-rt11 nanosleep() does have accurate behavior Gautam Thaker
@ 2008-11-07 19:17 ` Leon Woestenberg
0 siblings, 0 replies; 2+ messages in thread
From: Leon Woestenberg @ 2008-11-07 19:17 UTC (permalink / raw)
To: Gautam Thaker; +Cc: linux-rt-users
Hello Gautam,
On Fri, Nov 7, 2008 at 4:56 PM, Gautam Thaker <gautam.h.thaker@lmco.com> wrote:
> I recently started to study how nanosleep() behaves under 2.6.26.6-rt11
> compiled in in FULL PREEMPT, uniprocessor mode. I find that between
> 2.6.20-rt8 and this new kernel something has changed and nanosleep() is back
> to its old behavior or sleeping for next higher number of msec rather than
> carefully following the "y=x" line.
>
> I don't follow the RT world closely enough, but is this a regression or an
> expected change in behavior? The link below show the results very clearly.
>
> http://www.atl.external.lmco.com/projects/QoS/documents/nanosleep_1.png
>
This suggests (to me) that you probably did not enable HRTIMERS?
Regards,
--
Leon
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