Date: Sat, 31 Jan 2004 19:19:43 -0500 (EST) From: Robert Watson <rwatson@freebsd.org> To: Andy Farkas <andyf@speednet.com.au> Cc: Harald Schmalzbauer <h@schmalzbauer.de> Subject: Re: SCHED_ULE and nice still ignored Message-ID: <Pine.NEB.3.96L.1040131191144.14279A-100000@fledge.watson.org> In-Reply-To: <20040201100311.A81496@hewey.af.speednet.com.au>
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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@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@speednet.com.au
>
> Andy Farkas
> System Administrator
> Speednet Communications
> http://www.speednet.com.au/
>
>
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