cvs commit: src/sys/kern sched_ule.c

Robert Watson rwatson at
Wed Jul 7 09:07:18 PDT 2004

On Wed, 7 Jul 2004, Gleb Smirnoff wrote:

> On Wed, Jul 07, 2004 at 11:36:31AM -0400, John Baldwin wrote:
> J> >   Modified files:
> J> >     sys/kern             sched_ule.c
> J> >   Log:
> J> >   Temporarily disable preemption in SCHED_ULE due to reported panics and
> J> >   hangs due to recent preemption changes.  This change appears to remove
> J> >   the panic that I was running into, but at the cost of increasing
> J> >   ithread scheduling latency, and as such is a temporary band-aid until
> J> >   jhb has a chance to resolve the ule<->preemption interaction that is
> J> >   the source of the problem.  If it doesn't fix the problem for others--
> J> >   sorry!
> J> 
> J> It it just broken on SMP?  I actually did the commit from a UP preemption 
> J> kernel using SCHED_ULE from within X11 with KDE, etc. running.
> it is broken on UP, too. See thread in -current. 

An SMP kernel on a UP system, or a UP kernel on a UP system?

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert at      Principal Research Scientist, McAfee Research

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