how many cpus can freebsd support in smp?

[Paul Saab]

jhb         2003/03/21 13:46:15 PST

  FreeBSD src repository

  Modified files:        (Branch: RELENG_4)
    sys/i386/include     apic.h
  Log:
  MFC: rev 1.20: expand the APIC_ID_MASK to cover all 8 upper bits.  This
  fixes SMP on the SW7500CW2 motherboards.

You'll still need to increase NAPICID on the 8-way machine w/
hyperthreading.  It would be interesting to know if the machine boots
or if there's some other define that needs to be increased..

Cagle, John (ISS-Houston) (john.cagle at hp.com) wrote:
> It was about a month ago.  When was the APIC mask widened?
> 
> > -----Original Message-----
> > From: Brooks Davis [mailto:brooks at one-eyed-alien.net] 
> > Sent: Wednesday, March 26, 2003 4:11 PM
> > To: Cagle, John (ISS-Houston)
> > Cc: Barry Wu; freebsd-smp at freebsd.org
> > Subject: Re: how many cpus can freebsd support in smp?
> > 
> > 
> > On Wed, Mar 26, 2003 at 08:22:57AM -0600, Cagle, John 
> > (ISS-Houston) wrote:
> > > I've had 8 real cpus running on a ProLiant DL740.  I tried 
> > to get 16 
> > > (8 with hyperthreading), but the kernel needs xapic or 
> > clustered apic 
> > > support to do that.
> > 
> > Have you tried since the APIC mask was widened?  Prior to 
> > that it obviously wouldn't work since you had 8 bits and 16 CPUs.
> > 
> > -- Brooks
> > 
> > -- 
> > Any statement of the form "X is the one, true Y" is FALSE.
> > PGP fingerprint 655D 519C 26A7 82E7 2529  9BF0 5D8E 8BE9 F238 1AD4
> > 
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