[ltt-dev] IRQ timing accuracy of LTTng? (on ARM)

[Mathieu Desnoyers]

FYI, on ARM, LTTng only supports ccnt register based timestamps for
OMAP3 (which is very accurate). Other ARM sub-architectures rely on the
generic trace clock which gives a jiffy (HZ) accuracy.

Mathieu

* Paul Huang (paulh0803 at gmail.com) wrote:
> My architecture: ARM1136
> kernel: 2.6.29
> LTTng: 2.6.29-lttng-0.124
> LTT control: 0.56
> LTTv: 0.12.17
> 
> 2009/9/23 Mathieu Desnoyers <compudj at krystal.dyndns.org>
> 
> > What is your architecture and what LTTng version are you using ?
> >
> > Mathieu
> >
> > * Paul Huang (paulh0803 at gmail.com) wrote:
> > > Hi all,
> > > I used the LTTng to trace a touch panel driver on my device. From the
> > > resource viewer of LTTV, I found the IRQ of my touch panel driver is
> > > triggered every 10ms. But from the oscilloscope, the interrupt signal is
> > > triggered every 12ms. How does that happen?  Could anyone give me some
> > > advices? Thanks for your comments.
> >
> > > _______________________________________________
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> > > ltt-dev at lists.casi.polymtl.ca
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> >
> >
> > --
> > Mathieu Desnoyers
> > OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
> >

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68