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
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