Re: number of CPUs and IPI panic

From: John Baldwin <jhb_at_FreeBSD.org>
Date: Thu, 21 Oct 2004 17:05:45 -0400
On Wednesday 20 October 2004 09:05 pm, Stephan Uphoff wrote:
> Can you try the attached patch?
> ( Hope it still applies since it is a few weeks old)
>
> If this does not work I have a few more questions next week.

Unfortunately it can enable interrupts with sched_lock held which can result 
in deadlocks due to ithread preemption (IIRC, maybe not as badly with the 
newer preemption code.)

> 	Stephan
>
> On Wed, 2004-10-20 at 18:16, Nik Azim Azam wrote:
> > sorry for not posting this information earlier.
> >
> > i'm running on SCHED_4BSD, with PREEMPTION. the same
> > panic occours without PREEMPTION. the kernel is
> > generic except that i've removed some devices that i
> > dont need.
> >
> > --- Gavin Atkinson <gavin.atkinson_at_ury.york.ac.uk>
> >
> > wrote:
> > > On Wed, 20 Oct 2004, Nik Azim Azam wrote:
> > > > hello list,
> > > >
> > > > i'm doing some testing on a 6 cpu pentium II
> > >
> > > overdrive
> > >
> > > > computer with 6-CURRENT. with 6 cpus, the system
> > >
> > > will
> > >
> > > > panic easily with moderate load (previous IPI is
> > > > stuck). i edited sys/i386/sys/param.h file and
> > >
> > > lowered
> > >
> > > > the MAXCPU to 4. now the system is running with 4
> > >
> > > cpus
> > >
> > > > and it survived a make buildworld + portupgrade at
> > >
> > > the
> > >
> > > > same time.
> > > >
> > > > is this a known problem? i can give more
> > >
> > > information
> > >
> > > > if anyone interested.
> > >
> > > Are you using SCHED_ULE? (I believe it's the default
> > > in 6-CURRENT...)
> > >
> > > If so, try with SCHED_4BSD. ULE has known problems
> > > at the moment.
> > >
> > > Gavin
> >
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-- 
John Baldwin <jhb_at_FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org
Received on Thu Oct 21 2004 - 19:08:29 UTC

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