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 _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
