On Fri, 4 Apr 2008, Jeff Roberson wrote:
jeff 2008-04-04 01:16:18 UTC
FreeBSD src repository
Modified files:
sys/kern sched_ule.c
Log:
- Allow static_boost to specify no boost with '0', traditional kernel
fixed pri boost with '1' or any priority less than the current thread's
priority with a value greater than two. Default the boost to
PRI_MIN_TIMESHARE to prevent regular user-space threads from starving
threads in the kernel. This prevents these user-threads from also
being scheduled as if they are high fixed-priority kernel threads.
This is one of those unfortunate cases where one setting doesn't work for
everything and I just had to pick a value in the middle somewhere that
makes sense. I am likely to remove this tunable before 8.0 is complete
but if you notice any serious regressions please try setting
kern.sched.static_boost = 1.
Thanks,
Jeff
- Restore the setting of lowpri in tdq_choose(). It has to be either here
or in sched_switch(). I accidentally removed it from both places.
Tested by: kris
Revision Changes Path
1.240 +6 -2 src/sys/kern/sched_ule.c
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