cvs commit: src/sys/kern sched_ule.c
rwatson at FreeBSD.org
Wed Jul 7 09:06:19 PDT 2004
On Wed, 7 Jul 2004, John Baldwin wrote:
> On Tuesday 06 July 2004 01:57 am, Robert Watson wrote:
> > rwatson 2004-07-06 05:57:30 UTC
> > FreeBSD src repository
> > Modified files:
> > sys/kern sched_ule.c
> > Log:
> > Temporarily disable preemption in SCHED_ULE due to reported panics and
> > hangs due to recent preemption changes. This change appears to remove
> > the panic that I was running into, but at the cost of increasing
> > ithread scheduling latency, and as such is a temporary band-aid until
> > jhb has a chance to resolve the ule<->preemption interaction that is
> > the source of the problem. If it doesn't fix the problem for others--
> > sorry!
> It it just broken on SMP? I actually did the commit from a UP
> preemption kernel using SCHED_ULE from within X11 with KDE, etc.
I was only able to reproduce this with an SMP-enabled kernel; however, the
reports on -current were unclear and I didn't follow up on each one.
Robert N M Watson FreeBSD Core Team, TrustedBSD Projects
robert at fledge.watson.org Principal Research Scientist, McAfee Research
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