On 12/19/2012 10:30 PM, Damien Moody 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.
Thanks!
Damien
--
To unsubscribe from this list: send the line "unsubscribe
linux-rt-users" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
1 - yes. Have your email client filter mails with "announce" in the
header, to "rt kernel updates" folder for instance. Something like that.
2 - rt-patch provides extremely low latency, if you hardware can handle
it. Intel E5 is a good cpu, for extreme low latency.
Ck-patches doesn`t really provide any improvement over fair-scheduler.
Actually fair-scheduler performs on overall better, with lower peak
latencies. Ck-patches has slightly lower average latencies. While
audio-performance was similar when I tested both, visual jitter, was
less with fair scheduler, and 90hz timer.
I did some tests to make linux run with the least-jitter possible. You
can read the conlusions on that here:
http://paradoxuncreated.com/Blog/wordpress/?p=2268
It seems RT-patch is not neccesary for very low latency audio, and a
good firewire card, atleast on the old firewire-stack, hopefully the new
one is as good at latency, where I ran audio at 0.33ms latency, with
RT-threads.
The rt-patch using only threadmode, (not impacting performance, other
than on the thread it is used) might be good for audio, since visual
jitter already can be minimized on the regular kernel. if 0.33 should
not work with standard and it is a software problem, or you want to try
even lower. 0.2ms is very close to virtual hardware, and ofcourse is
something a musician would want.
Other than that RT patch might have specific uses outside general
computing and media.
Peace Be With You.
--
To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
