On Tue, 2006-06-06 at 14:31 -0400, Joshua Boyd wrote: > On Tue, Jun 06, 2006 at 01:39:31PM -0400, Lee Revell wrote: > > On Tue, 2006-06-06 at 11:10 -0400, Joshua Boyd wrote: > > > I have CONFIG_PREEMPT and CONFIG_PREEMPT_BKL on. My application runs > > > with SCHED_FIFO and has an elevated priority, but not realtime > > > priority. When I tried setting it to realtime priority it grinds the > > > networking, control panel, and VGA display applications to a halt. > > > > Uhhh, SCHED_FIFO and "realtime priority" are the same thing. > > > > Can you be more specific? > > setpriority(PRIO_PROCESS, 0, -20); > > I was under the impression that that set priority to a "realtime" > priority, although rereading the man page I don't see any specific > correlation listed between -20 and realtime. > > I also do: sched_setscheduler(0, SCHED_FIFO, &sp); > > When I do the setpriority to -20, basically everything other than the > main application grinds to a halt. If I use -10 instead, other programs > work fine, but networking is then allowed to interfere with the main > program. Just checking - is the SCHED_FIFO thread ever yielding the CPU? Or is it just running a loop without ever sleeping or waiting for some lock? -- Lars Luthman - please encrypt any email sent to me if possible PGP key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x04C77E2E Fingerprint: FCA7 C790 19B9 322D EB7A E1B3 4371 4650 04C7 7E2E
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