Date: Thu, 24 Jan 2008 13:56:30 +0100 From: Pietro Cerutti <gahr@gahr.ch> To: Attilio Rao <attilio@freebsd.org>, freebsd-hackers@freebsd.org Subject: Re: SMP in machine/params.h Message-ID: <47988AFE.1010903@gahr.ch> In-Reply-To: <3bbf2fe10801240448wb5009cai16721aff75579773@mail.gmail.com> References: <479886CF.7040506@gahr.ch> <3bbf2fe10801240448wb5009cai16721aff75579773@mail.gmail.com>
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Attilio Rao wrote:
> 2008/1/24, Pietro Cerutti <gahr@gahr.ch>:
>> Hello,
>>
>> I'm running a Core2Duo on CURRENT, SMP kernel, but somehow the macro S=
MP
>> in machine/param.h 1.81 2006/01/09 line 68 is not defined, thus MAXCPU=
>> is defined to 1. Any idea why?
>>
>>> uname -a
>> FreeBSD gahrtop.localhost 8.0-CURRENT FreeBSD 8.0-CURRENT #23: Tue Jan=
>> 22 00:15:05 CET 2008
>> root@gahrtop.localhost:/usr/obj/usr/src/sys/MSI1034 i386
>>
>>> sysctl kern.smp.active kern.smp.maxcpus
>> kern.smp.active: 1
>> kern.smp.maxcpus: 16
>>
>>> cat smp.c
>> #include <sys/param.h>
>>
>> #ifndef SMP
>> # error SMP not defined
>> #endif
>>
>>
>>> make smp
>> cc -O2 -pipe -march=3Dpentiumpro smp.c -o smp
>> smp.c:5:3: error: #error SMP not defined
>> *** Error code 1
>>
>>> cat maxcpu.c
>> #include <sys/param.h>
>> #include <stdio.h>
>>
>> int main(void)
>> {
>> return (MAXCPU);
>> }
>>
>>> ./maxcpu; echo $?
>> 1
>>
>> Any idea?
>=20
> Did you define SMP in your config file?
Yes. How could I have kern.smp.active: 1 otherwise?
> grep SMP /sys/i386/conf/MSI1034
# To make an SMP kernel, the next two lines are needed
options SMP # Symmetric MultiProcessor Kernel
>=20
> Attilio
>=20
>=20
--=20
Pietro Cerutti
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http://gahr.ch/pgp
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