Re: [LAU] resubmitting questions from last week

On Mon, 3 Aug 2009, Paul Neaveill wrote:

> Sorry if someone responded and we missed it, but despite much googling
> and all of that, am still working on getting my own kernel(s) [2
> machines] going with the following as had been suggested last week:
>
> preempt_RCU
> No_Hz
> HZ_1000
>
> and the other Rock-solid low-latency audio tweaks
> 99 ff migration
> 99 ff posixcputmr
> 98 ff IRQ-8 (real-time clock)
> 97 ff audio IRQ
> 80 rr Jack
>
> Found the preempt_RCU and HZ_1000 spots in the debian/ubuntu kernel
> hack, still looking for the rest please.?
>
> ** Would really appreciate the assistance with figuring out where/how
> to put those.

I never did get an answer to some of those questions either, so I
figured maybe I'd been asking too many. (I have been posting a lot of
them lately.)

I think the ones you've got at the top for kernel options should be
safe. I'm going to try -- at least initially -- not adjusting any IRQ
priorities though. It might work, considering I've got a fast machine,
and from what I hear, there are even people getting away with ordinary
non-RT kernels these days.

Preempt RCU was supposed to be buggy for awhile, but tested now for two
years... (Source: LKML)

Somebody said NO_HZ was actually a good thing on a laptop being used for
pro-audio, and I suppose if you can do well on a laptop you can do well
anywhere... (Source: Some guy with a laptop.)

And HZ_1000 is recommended almost everywhere.

I don't know what the meaning of NO_HZ and HZ_1000 is together, but I
guess it'd mean a jiffy rate of 1000Hz, but only when interrupts are
needed?

I'm just putting stuff together from lots of googling too...

-- 
+ Brent A. Busby	 + "We've all heard that a million monkeys
+ UNIX Systems Admin	 +  banging on a million typewriters will
+ University of Chicago	 +  eventually reproduce the entire works of
+ Physical Sciences Div. +  Shakespeare.  Now, thanks to the Internet,
+ James Franck Institute +  we know this is not true." -Robert Wilensky
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