sched_ule performance on single CPU

[O. Hartmann]

I did the update of my sources as well and compiled a new world.

Then I started build_world (with SCHED_ULE) as usual - and recognized 
the same stuck bahaviour under high load as usual :-( For me there is no 
release of pain ...


Oliver
Unga wrote:
> --- Jeremy Chadwick <koitsu at freebsd.org> wrote:
>
>   
>> There was a commit to the ULE code in RELENG_7
>> approximately 6 hours ago
>> by Jeff, indicating some speed improvements in ULE
>> when there's heavy
>> IRQ activity, and adjustments in the timeslicing
>> code for threads which
>> don't utilise timesharing:
>>
>>
>>     
> http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/kern/sched_ule.c
>   
>> Can you update your src-all tree to pull this in,
>> rebuild the kernel,
>> and tell us if it behaves better for you?
>>
>>     
>
> Thanks Jeff for updates and thanks Jeremy for
> notifying the list.
>
> I did following test on the new update of sched_ule.c
> on RELENG_7.
>
> I ran the amarok music player as realtime, and another
> application named count as a normal process. When the
> normal process showing the value of i > 20, the amarok
> crashes as it cannot keep up the required audio
> supply.
>
> That is, normal process starved the realtime process!
>
>
>   PID USERNAME    THR PRI NICE   SIZE    RES STATE  C 
>  TIME   WCPU COMMAND
>  1100 root          1 118    0  3120K   720K CPU0   0 
>  1:42 100.00% count
>   963 root          1  46    0   163M 27368K select 0 
>  0:18  5.96% Xorg
>  1060 test          6  44    0 68380K 51568K ucond  1 
>  0:00  5.47% amarokapp
>
> rtprio 963
> rtprio: normal priority
>
> rtprio 1060
> rtprio: realtime priority 0
>
> rtprio 1100
> rtprio: normal priority
>
>
>
> /* Count */
>
> #include <stdio.h>
>
> main()
> {
>  double nc;
>  int i;
>
>  for (i=0; i < 100; i++)
>  {
>   for (nc=0; nc < 2000000000; nc++)
>      ;
>   printf("%d : %.0f\n", i, nc);
>  }
>
> }
>
> Kind Regards
> Unga
>
>
>
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