On Wed, 19 Dec 2012 21:30:29 +0000 Damien Moody <webmaster@xxxxxxxxxxxxxxxx> wrote: > Hi, > > I have a couple of questions. > > 1. I'd like to keep informed when the rt kernel gets updated, so I can > put up a new Gentoo ebuild on my site (gentoostudio.org). Is this the > list for that? If not, what is? > > 2. I use the rt patches a la rt-sources on Gentoo. I'm a musician and > audio engineer. What advantages does the rt patch set provide over other > patch sets like ck-sources and pf-sources, where latency can be > configured to be very low? I'd like to document this on my site. > I use an RT-patched kernel with Fedora to record drum tracks with Ardour3+jack+ffado. I can record 16-channels of 24-bit samples at 48000Hz through a pair of Presonus FP10s attached to a Lenovo W510 laptop and I honestly can't remember the last time I had an xrun. I'm sure plenty of people can do this with a standard kernel that's been tuned but no matter how much they tune it, there's always the possibility of running into a priority-inversion situation. The RT patchset converts most of the spinlocks in the kernel to an rt_mutext_t. The rt_mutex_t lock has a priority-inheritance chain that allows for a temporary priority boost of a thread holding a lock when a higher priority thread tries to claim the lock. This prevents intermediate priority threads from preventng the lock-holder thread from running, delaying the high priority thread indefinitely. Clark
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