hi, > Hi, > > I would like to change upreempt_pri to default to 0 as this makes > wakeups where the interrupted cpu schedules a thread on another cpu > behave like as if it where scheduled on the interrupted cpu. > > For the case that the to be scheduled on cpu is the interrupted one, > the behavior is like having upreempt_pri set to 0, as rescheduling > happens on return too usermode while in the cross cpu case this might be > delayed until the next timer interrupt. > > This change makes some sluggishness regarding X to go a way. > (Solaris defaults to 0 here as well, I think the only reason to set it > higher is on very big SMP machines where throughput is more important > then latency) > > Lars
i'm not sure how it can make much differences given that l_kpribase is normally PRI_KERNEL. can you explain a little more? or, even better, can you try to create a smaller test program to demonstrate the sluggishness? YAMAMOTO Takashi
