Re: Cyclictest usage

[Gregory Haskins <ghaskins@novell.com>]

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Tobias Knutsson wrote:
> Hello,
>
> I'm trying to do some initial benchmarking on a rt-kernel versus a
> vanilla kernel. On the rt the results are stable in between test runs
> using the following command:
>
> cyclictest -t 1 -p 80 -c 1 -n -i 10000 -l 10000
>
> However, using the same command while running the vanilla kernel, I
> get very varying results. And I would completely understand if it was
> due to increased jitter. The thing is, the jitter is very low (0%
> load) but the average times varies from 600 us to 6500 us depending on
> when the test is initiated.
>
> I imagine this might have something to do with not having high res
> timers in the vanilla kernel. If that is what's causing my problems.
> What is the best way of comparing the two kernels?
>
> I would be much greatful for a few pointers!
>
>   

Hi Tobias,
  What kernel versions are you testing out?


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