Re: PREEMPT_RT vs I-PIPE: the numbers, part 2

From: Ingo Molnar
Date: Wed Jun 22 2005 - 12:42:58 EST

* Kristian Benoit <kbenoit@xxxxxxxxxxx> wrote:

> Your analysis is correct, but with 600,000 samples, it is possible
> that we got 2 peeks (perhaps not maximum), one on the logger and one
> on the target. So in my point of view, the maximum value is probably
> somewhere between 55us / 2 and 55us - 7us. And probably closer to 55us
> / 2.

you could try the LPPTEST kernel driver and testlpp utility i integrated
into the -RT patchset. It avoids target-side latencies almost
completely. Especially since you had problems with parallel interrupts
you should give it a go and compare the results.

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