25 Apr
2008
25 Apr
'08
2:48 p.m.
On Fri, 2008-04-25 at 12:35 -0400, Joshua D. Boyd wrote:
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.
Hardware events (including network traffic) causes interrupts, which are
handled by the kernel. I don't know of a way to give the interrupt
handlers lower priority without making them threaded (which as far as I
know still requires the RT patch).
--ll