Re: How to use latency trace

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On Fri, 2007-11-02 at 17:23 +0530, Jaswinder Singh wrote:
> hello Gerrit Binnenmars,
> 
> 
> On 11/2/07, Gerrit Binnenmars <gerritbinnenmars@xxxxxxxxxx> wrote:
> >
> > Another question: can you ever guarantee a max. latency if a user has access
> > to the system?
> >
> 

The user could trip over the power chord!

Seriously, users cannot use the high priorities, so apps running above
the user's MAX_PRIO should be safe from whatever the user does.

> I do not think so. this shows this is soft real time.
> 

> It best example is :
> 
> http://rt.wiki.kernel.org/index.php/Cyclictest
> 
> you can request for interval for 1000 so it should come 1000 all the
> time, but it is not.

Its should come CLOSE to 1000. What errors have you seen?

Have you run latency trace on your workload to identify any long
code-paths that need to be cleaned up?

Sven

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