Messages in this thread |  | | Date | Fri, 21 Jun 2002 13:10:14 -0600 | From | "Bhavesh P. Davda" <> | Subject | Re: [PATCH] SCHED_FIFO and SCHED_RR scheduler fix, kernel 2.2.21 |
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Alan Cox wrote: >>The 2.2.21 kernel was behaving incorrectly for SCHED_FIFO and SCHED_RR >>scheduling. > > > Looks fine but I dont want to apply behaviour changing non critical stuff > to 2.2
Oh, no!
What's going on with the kernel community? I posted a similar fix for the 2.4.18 kernel, and it hasn't been picked up there either.
For the 2.4.18 kernel scheduler, our 86 process application (SCHED_FIFO, priorities 7-23, System V semaphores for priority preemption) won't even stay up without my patch.
The 2.2.21 SCHED_FIFO behaviour is correct but slightly inefficient, while the SCHED_RR behaviour is plain broken. What is an application that depends on correct SCHED_RR behaviour to do in that case? There are applications where increased latencies as a result of SCHED_RR being broken are unacceptable.
-- Bhavesh P. Davda Avaya Inc Room B3-B03 E-mail : bhavesh@avaya.com 1300 West 120th Avenue Phone : (303) 538-4438 Westminster, CO 80234 Fax : (303) 538-3155
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