Messages in this thread | ![/](/images/icornerl.gif) | | Date | Wed, 18 Jun 2003 15:34:02 -0400 | From | Joe Korty <> | Subject | Re: O(1) scheduler seems to lock up on sched_FIFO and sched_RR tasks |
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On Wed, Jun 18, 2003 at 09:47:24AM -0700, george anzinger wrote: > It seems that once a SCHED_FIFO or SCHED_RR tasks gets control it does > not yield to other tasks of higher priority. > > Attached is a test program (busyloop) that just loops doing > gettimeofday() for the requested time and a little utility (rt) to run > programs at real time priorities. > > Here is an annoted example of the problem: > > First, become root then: > > rt 90 bash <-- run bash at priority 90 SCHED_RR > > rt -f 30 busyloop 10 & <-- busyloop 10 at priority 30 SCHED_FIFO > > At this point the bash at priority 90 should be available, but is not. > When the 10 second busyloop completes, bash returns.
Hi George, When I boost the priority of each of the per-cpu 'events/%d' daemon to 96, the problem goes away.
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