Messages in this thread | | | Subject | Re: realtime scheduling problems with 2.4 linux kernel >= 2.4.10 | From | Andi Kleen <> | Date | 01 Jun 2002 19:05:47 +0200 |
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Mike Kravetz <kravetz@us.ibm.com> writes:
> This works fine for me on 2.4.17 with a SERIAL console. Could this > be related to some differences (new features) in the VGA console? > I am totally ignorant of how the consoles work.
One possibility is that something relies on schedule_task() - keventd doesn't run with realtime priority and can be starved.
Seems to be the case indeed:
/usr/src/linux/drivers/char% grep schedule_task *.c console.c: schedule_task(&console_callback_tq); ...
the console switch does.
Fixing it would require boosting keventd's priority either globally or temporarily. E.g. if the original reporter could put this (untested/uncompiled) at the beginning of kernel/context.c:context_thread():
current->policy = SCHED_RR; current->rt_priority = 99;
it could fix his problem.
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