Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.32-6

[Florian Schmidt <mista.tapas@gmx.net>]

On Thu, 9 Dec 2004 09:16:49 -0600
Mark_H_Johnson@raytheon.com wrote:

> Comparison of .32-5RT and .32-5PK results
> RT has PREEMPT_RT,
> PK has PREEMPT_DESKTOP and no threaded IRQ's.
> 2.4 has lowlat + preempt patches applied

But you do have set your reference irq (soundcard) to the highest prio
in the PREEMPT_RT case? I just ask to make sure. Also, the PK results
can probably even be improved by having all irq handlers threaded except
for the soundcard irq.

> 
>       within 100 usec
>        CPU loop (%)   Elapsed Time (sec)    2.4
> Test   RT     PK        RT      PK   |   CPU  Elapsed
> X     90.46  99.88      67 *    63+  |  97.20   70
> top   83.03  99.87      35 *    33+  |  97.48   29
> neto  91.69  97.57     360 *   320+* |  96.23   36
> neti  88.37  97.79     360 *   300+* |  95.86   41
> diskw 87.73  67.41     360 *    57+* |  77.64   29
> diskc 86.35  99.39     360 *   320+* |  84.12   77
> diskr 81.57  99.89     360 *   320+* |  90.66   86
> total                 1902    1413   |         368
>  [higher is better]  [lower is better]
> * wide variation in audio duration
> + long stretch of audio duration "too fast"
> 

Flo

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