On Wed, 2007-11-28 at 08:12 -0600, K.R. Foley wrote: > John Sigler wrote: > > Hello Steven, > > > > Steven Rostedt wrote: > > > >> John Sigler wrote: > >> > >>> I need to change the priorities of several soft and hard IRQ handlers. > >>> > >>> Namely, > >>> > >>> o reduce the prio of "softirq-timer" handler to 10 > >>> > >>> o reduce the prio of IRQ14 and IRQ15 handlers to 20 > >>> (my flash drives do not support DMA BTW...) > >>> > >>> o boost the prio of my I/O boards' IRQ handlers to 60 > >>> (there can be 1 or 2 boards, the driver is a kernel module > >>> which is loaded after the system has booted.) > >>> > >>> I've written a short program that calls > >>> sched_setscheduler(pid, SCHED_FIFO, ¶m); > >>> with the appropriate pid, which I look up using ps -ef > >> > >> Look for the program "chrt". It does this for you. This program is > >> available in all major distributions of Linux. > > > > Thanks for the tip. > > > > For the record, I found schedutils on Robert Love's page: > > > > http://rlove.org/ > > http://rlove.org/misc/schedutils-1.5.0.tar.gz > > > > However, I had already solved that part of the problem with a > > program of my own. > > > > My real problem is: the IRQ handlers for the I/O boards are > > only instantiated when the kernel module is inserted. How do > > I /reliably/ determine their pid? > > What about something like: > chrt -f -p 99 `/sbin/pidof 'IRQ 8'` > > > Keep in mind that if you are on a shared IRQ line, you will be boosting the priority of other interrupts as well. Sven - 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
