Re: [patch] Real-Time Preemption, -RT-2.6.10-rc1-mm3-V0.7.25-1

[Gunther Persoons]

Ingo Molnar wrote:

> * Gunther Persoons <gunther_persoons@xxxxxxxxxx> wrote:
>
>  
>
> > As i thought the init scripts were my problem. But i have an other
> > question. I recently started to use NFS. But with the mainline kernel
> > cpu usage is 100%, and when i look in top si shows bewteen 40 and 60%
> > cpu usage. With your kernel si is 0%, but ksoftriqd/0 shows around 38%
> > cpu usage and total cpu usage is around 52%. Is this normal? on my
> > server cpu usage is 2% but it uses a intel network card. My laptop is
> > using a wireless pcmcia card (cisco).
> >    
>
> normally the RT kernel has higher system overhead (all IRQ traffic goes
> to separate thread contexts, involving context-switching, etc.) so a
> _reduction_ in system overhead looks a bit strange. Is there a
> difference in performance?
>
> 	Ingo
>
>  
With the mainline kernel i get speeds around 600-700kb/s and with the RT 
kernel i get speeds around 550kb/s. No other differnces except the cpu 
usage and that the RT kernel feels much more responsive.
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