Date: Mon, 14 Jul 2003 15:05:48 -0500 From: "Cagle, John (ISS-Houston)" <john.cagle@hp.com> To: "Attila Nagy" <bra@fsn.hu> Cc: =?iso-8859-1?Q?Patrik_Vesel=EDk?= <veselik@ssakhk.cz> Subject: RE: maximum of CPUs Message-ID: <C50AB9511EE59B49B2A503CB7AE1ABD10476C7AF@cceexc19.americas.cpqcorp.net>
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If you enable hyperthreading on an 8-way server, you'll end up with 16 = logical processors (and a *whole bunch* of APIC's) -- a scenario that is = not comprehended by FreeBSD. In other words, there needs to be some = more engineering done on FreeBSD to support more than 8 processors = (AFAICT). > -----Original Message----- > From: Attila Nagy [mailto:bra@fsn.hu]=20 > Sent: Monday, July 14, 2003 2:59 PM > To: Cagle, John (ISS-Houston) > Cc: Patrik Vesel=EDk; freebsd-smp@freebsd.org > Subject: Re: maximum of CPUs >=20 >=20 > Cagle, John (ISS-Houston) wrote: > > I think that 8 CPUs is pretty much the limit for FreeBSD. > > We have FreeBSD 5.1 running on an 8-way HP ProLiant DL740 and HP > > ProLiant DL760. (That's 8 processors *without* using=20 > hyperthreading.) > Just out of curiosity: what happens if you enable hyperthreading?
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