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Date: Mon, 20 Jun 2011 17:02:39 +0200
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai-help] Xenomai on i7-870
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To: Jakub Nowacki <j.s.nowacki@domain.hid>
Cc: Xenomai help <xenomai@xenomai.org>

On 06/20/2011 04:34 PM, Jakub Nowacki wrote:
> Interestingly, I'm getting the same results for core2 kernel without
> SMI workaround working. I was just getting high latencies approx. 70
> us for generic kernel. I'm not sure though how is it possible. Also,
> the higher latencies of above 10 us are arriving not too often but
> relatively regularly (without any visible pattern, though). I'm not
> sure if such a latencies are rather normal or caused by something
> 'bad'.

To make proper benchmarks, you should:
- let the latency run long
- provide some load, you can use the dohell script in xenomai-head to
generate the load.

That said, having some spikes is not abnormal. The real question is to
know whether the latencies your get are sufficient for your application.

> ioctl(RTTST_RTIOC_SWTEST_CREATE_KTASK): Cannot allocate memory

You have to increase CONFIG_XENO_OPT_SYS_STACKPOOLSZ.

-- 
					    Gilles.