On 04/22/2012 01:24 PM, Gilles Chanteperdrix wrote:
> On 04/22/2012 11:10 AM, Wolfgang Grandegger wrote:
>> But all this does not explain a factor of 3 with your driver. I doubt
>> that it's due to a move from 2.6.29 -> 2.6.32. Try using ftrace to find
>> out what's going on (if it's already available).
>
> Threaded interrupts were introduced around this time. And threaded
> interrupts DO have a significant impact on latencies.
>
But I agree: tracing with ftrace or the I-pipe tracer if using xenomai
to see where the time is spent is the way to go.
--
Gilles.
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