Re: SCHED_ULE and nice still ignored

On Sun, 1 Feb 2004, Andy Farkas wrote:

> Steve Kargl wrote:
> 
> > Seems to work for me.  You need to describe your problem better.
> 
> sched_ule broke about a week ago. The following example shows an idle 4
> CPU SMP box running -current from 2 days ago. Note the CPU percentages
> for the idle threads: 

The load average measurement appears to be broken, regardless of
scheduler.  The best thing for now, until load average measurement is
fixed (hopefully RSN) is to ignore load as a measure of system "business".
However, the niceness issue is separate.  ULE seems to be treating
niceness as a proportional scheduling priority, whereas 4BSD treats
niceness more like realtime priority levels...

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert_at_fledge.watson.org      Senior Research Scientist, McAfee Research


> 
> $ top -Sb
> last pid: 67063;  load averages:  0.32,  0.38,  0.39  up 1+12:08:26  10:02:38
> 91 processes:  6 running, 71 sleeping, 14 waiting
> Mem: 82M Active, 300M Inact, 76M Wired, 29M Cache, 60M Buf, 11M Free
> Swap: 64M Total, 64M Free
> 
>   PID USERNAME   PRI NICE   SIZE    RES STATE  C   TIME   WCPU    CPU COMMAND
>    10 root       -16    0     0K    12K CPU3   3  34.3H 153.91% 153.91% idle: cpu3
>    11 root       -16    0     0K    12K CPU2   2  34.1H 98.44% 98.44% idle: cpu2
>    13 root       -16    0     0K    12K RUN    0  24.8H 92.97% 92.97% idle: cpu0
>    12 root       -16    0     0K    12K CPU1   1  32.6H 32.03% 32.03% idle: cpu1
>    67 root        20    0     0K    12K syncer 3  34:36  4.69%  4.69% syncer
> 67063 andyf       84    0  2200K  1328K CPU0   0   0:00  3.12%  3.12% top
> 
> 
> Also, this box sits idle alot (like it is in the example above) yet the
> load average now does not return to 0.00 like it used to.
> 
> WITNESS and INVARIANTS is turned off, ADAPTIVE_MUTEXES turned on.
> 
> There is something definately not right anymore.
> 
> --
> 
>  :{ andyf_at_speednet.com.au
> 
>         Andy Farkas
>     System Administrator
>    Speednet Communications
>  http://www.speednet.com.au/
> 
> 
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