25 Apr
2008
25 Apr
'08
5:44 p.m.
Le Fri, 25 Apr 2008 12:35:43 -0400,
"Joshua D. Boyd" <jdboyd(a)jdboyd.net> a écrit :
Is it possible to configure a system (included changes
to programs) so
that nothing can interfere with a few RT threads?
I have an audio and video thread in a program, and they are running as
SCHED_FIFO, but so many things can interfere with those two threads,
such as USB plugs/unplugs, cron log rotations, disk access (PIO flash
disk), ssh logins, etc. I really would like to shore up performance
here.
I am not using Ingo's RT patches, but I still see people talking about
turning off things like cron and server processes to prevent xruns when
using Ingo's RT patches. While I have turned off cron, turning off sshd
and the web server aren't options. I want to instead somehow make sure
that neither can every interfere with the AV threads, even if it means
that SSH and web traffic are extremely slow.
http://proaudio.tuxfamily.org/wiki/index.php?title=Realtime_%28RT%29_Kernel…
You must use the rtirq package. It is a boot script that use chrt to fix the
priorities for different IRQ. The trick is to setup the highest priority to the
rtc (the system will hang otherwise), followed by the sound, followed by the
other pieces of hardware.
If your distribution doesn't provide this package: http://www.rncbc.org/jack/
Cheers,
Dominique