HEADS-UP: Be careful with newest GENERIC...

John Baldwin jhb at FreeBSD.org
Thu Sep 9 08:29:18 PDT 2004

On Thursday 09 September 2004 08:12 am, Ken Smith wrote:
> I'm having mixed results with the new GENERIC which switches the
> default scheduler to 4BSD and turns on PREEMPTION.  It's fine
> with the 4BSD scheduler but PREEMPTION seems to be causing some
> problems on a few of my machines.
> If you give PREEMPTION a try I'd be interested in hearing if it's
> successful or not.  I'm wondering if I'm just "lucky" and it's
> OK for everyone else or if it's causing other people problems too.

sparc64 has never run with preemption on before (it never had the older 
ithread preemption turned on) so it is probably not safe to use yet.  I would 
recommend turning it off until someone's had a chance to look at the 
low-level interrupt code to see if it's ready for preemption.

John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org

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