Re: powerd freeze with amd 5000 X2 but not with lower cpus

On Sat, Jul 28, 2007 at 11:00:15PM +0200, Michael Nottebrock wrote:
Kris Kennaway schrieb:
On Sat, Jul 28, 2007 at 03:46:15PM +0200, Michael Nottebrock wrote:


Meanwhile I found a workaround for my system: I had SCHED_ULE configured
in my kernel - switching to SCHED_4BSD gets rid of the freezes. Should
have thought of that sooner, ISTR having problems with powerd and
SCHED_ULE even on single cpu P4s.


I see you've now learned a reason why no-one should be using SCHED_ULE
on FreeBSD < 7 ;-)

... and with SCHED_ULE being obsoleted by SCHED_SMP in 7+, it might
actually become the scheduler nobody was ever supposed to be using? It
might still be worthwhile doing some experimenting with powerd and the
different schedulers in -CURRENT, just in case 4BSD ever gets knocked
from GENERIC. :)

There has been so much publicity about SCHED_ULE being broken and
contraindicated on 6.x and older versions that it's hard to understand
why people persist in using it and then being surprised when it fails
for them. It's also kind of irritating because it ties up developer
time when problems are reported and it only later emerges that the
user is using ULE.

As you know, the version of ULE in 7.0 is completely revised, and has
the advantage of actually working. If you see problems with ULE in
7.0, please report them on current. If you are still using ULE on
-stable, please stop.

Kris
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