Re: [PATCH]sched: Isochronous class v2 for unprivileged soft rt scheduling

[Con Kolivas <kernel@kolivas.org>]

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Paul Davis wrote:
>>The idea is to get equivalent performance to SCHED_FIFO. The results 
>>show that much, and it is 100 times better than unprivileged 
>>SCHED_NORMAL. The fact that this is an unoptimised normal desktop 
>>environment means that the conclusion we _can_ draw is that SCHED_ISO is 
>>as good as SCHED_FIFO for audio on the average desktop. I need someone 
> 
> 
> no, this isn't true. the performance you are getting isn't as good as
> SCHED_FIFO on a tuned system (h/w and s/w). the difference might be
> the fact that you have "an average desktop", or it might be that your
> desktop is just fine and SCHED_ISO actually is not as good as
> SCHED_FIFO. 

<pedantic mode>
On my desktop, whatever that is, SCHED_FIFO and SCHED_ISO results were 
the same.
</pedantic mode>

> 
>>with optimised hardware setup to see if it's as good as SCHED_FIFO in 
>>the critical setup.
> 
> 
> agreed. i have every confidence that Lee and/or Jack will be
> forthcoming :)

Good stuff :).

Meanwhile, I have the priority support working (but not bug free), and 
the preliminary results suggest that the results are better. Do I recall 
someone mentioning jackd uses threads at different priority?

Cheers,
Con

P.S. If you read any emotion in my emails without a smiley or frowny 
face it's unintentional and is the limited emotional range the email 
format is allowed to convey. Hmm.. perhaps I should make this my sig ;)

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