Date: Fri, 29 Nov 1996 12:35:24 -0700 From: Steve Passe <smp@csn.net> To: Peter Wemm <peter@spinner.dialix.com> Cc: Erich Boleyn <erich@uruk.org>, Nate Williams <nate@mt.sri.com>, Steve Passe <smp@csn.net>, freebsd-smp@freebsd.org Subject: Re: Pentium CPU steppings Message-ID: <199611291935.MAA29466@clem.systemsix.com> In-Reply-To: Your message of "Sat, 30 Nov 1996 01:42:00 %2B0800." <199611291742.BAA19182@spinner.DIALix.COM>
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Hi,
different P5s I have:
---
1:
FreeBSD 2.1.0-RELEASE #9: Wed Aug 14 20:42:01 MDT 1996
CPU: 86-MHz Pentium 735\\90 or 815\\100 (Pentium-class CPU)
Origin = "GenuineIntel" Id = 0x521 Stepping=1
>>> Features=0x1bf<FPU,VME,PSE,MCE,CX8,APIC>
$ fdiv
x = 4195835.000000, y = 3145727.000000, result = 256.000000, FDIV BUG PRESENT
---
2:
FreeBSD 2.1.5-RELEASE #0: Thu Jul 25 21:17:19 MDT 1996
CPU: 133-MHz Pentium 735\\90 or 815\\100 (Pentium-class CPU)
Origin = "GenuineIntel" Id = 0x52c Stepping=12
>>> Features=0x1bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8>
$ fdiv
x = 4195835.000000, y = 3145727.000000, result = 0.000000, FDIV OK
---
3:
FreeBSD 3.0-SMP #0: Fri Nov 29 10:03:58 MST 1996
CPU: Pentium (586-class CPU)
Origin = "GenuineIntel" Id = 0x52c Stepping=12
Features=0x3bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,APIC>
3 % fdiv
x = 4195835.000000, y = 3145727.000000, result = 0.000000, FDIV OK
Processors: APIC ID Version State Family Model Step Flags
0 0x11 BSP, usable 5 2 1 0x07bf
1 0x11 AP, usable 5 2 1 0x07bf
---
note that both 1 & 2 have a feature value of 1bf, neither
of which have the APIC bit set (bit #9). 2.1.0 claims the
90mHz chip has an APIC, which I didn't expect, while 2.1.5
claims it doesn't have an APIC, which is consistant with 1bf.
However this is a fairly new chip so I think it really does have
an APIC.
also note that the kernel says stepping 12 for #3, but mptable always says
stepping 1. I previously said that I think certain MP BIOS report
a BAD value for the CPU APIC version number, I now add CPU stepping as
reported by some MP BIOS (and thus mptable) as being suspect.
--
Steve Passe | powered by
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