6.2-RELEASE does not use second CPU on pentium D

[John Baldwin]

On Wednesday 25 April 2007 04:47:48 am Alex Povolotsky wrote:
> Hello!
> 
> I have a Pentium D box, running 6.2-RELEASE. In dmesg, I see CPU#1 
> launched, but I never see any process running on it, and mptable shows
> 
> cluster-one# mptable -verbose
> 
> 
===============================================================================
> 
> MPTable
> 
>  looking for EBDA pointer @ 0x040e, found, searching EBDA @ 0x0009e800
>  searching CMOS 'top of mem' @ 0x0009e400 (633K)
>  searching default 'top of mem' @ 0x0009fc00 (639K)
>  searching BIOS @ 0x000f0000
> 
>  MP FPS found in BIOS @ physical addr: 0x000fe200
> 
> -------------------------------------------------------------------------------
> 
> MP Floating Pointer Structure:
> 
>   location:                     BIOS
>   physical address:             0x000fe200
>   signature:                    '_MP_'
>   length:                       16 bytes
>   version:                      1.4
>   checksum:                     0x9f
>   mode:                         Virtual Wire
> 
> -------------------------------------------------------------------------------
> 
> MP Config Table Header:
> 
>   physical address:             0x000fe210
>   signature:                    'PCMP'
>   base table length:            64
>   version:                      1.4
>   checksum:                     0x7f
>   OEM ID:                       ''
>   Product ID:                   ''
>   OEM table pointer:            0x00000000
>   OEM table size:               0
>   entry count:                  1
>   local APIC address:           0xfee00000
>   extended table length:        0
>   extended table checksum:      0
> 
> -------------------------------------------------------------------------------
> 
> MP Config Base Table Entries:
> 
> --
> Processors:     APIC ID Version State           Family  Model   Step    
> Flags
>                  0       0x14    BSP, usable     15      6       4       
> 0xbfebfbff
> 
> 
===============================================================================
> 
> while in dmesg
> 
> Copyright (c) 1992-2007 The FreeBSD Project.
> Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
>         The Regents of the University of California. All rights reserved.
> FreeBSD is a registered trademark of The FreeBSD Foundation.
> FreeBSD 6.2-RELEASE-p3 #2: Thu Apr 19 00:19:54 MSD 2007
>     tarkhil at cluster-one.zinester.com:/usr/obj/usr/src/sys/P4D
> WARNING: debug.mpsafenet forced to 0 as ipsec requires Giant
> WARNING: MPSAFE network stack disabled, expect reduced performance.
> Timecounter "i8254" frequency 1193182 Hz quality 0
> CPU: Intel(R) Pentium(R) D CPU 2.80GHz (2808.41-MHz 686-class CPU)
>   Origin = "GenuineIntel"  Id = 0xf64  Stepping = 4
>   
> 
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH
> ,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
>   Features2=0xe49d<SSE3,RSVD2,MON,DS_CPL,EST,CNTX-ID,CX16,<b14>,<b15>>
>   AMD Features=0x20100000<NX,LM>
>   AMD Features2=0x1<LAHF>
> real memory  = 1046757376 (998 MB)
> avail memory = 1015095296 (968 MB)
> ACPI APIC Table: <INTEL  DG965SS >
> FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
>  cpu0 (BSP): APIC ID:  0
>  cpu1 (AP): APIC ID:  1
> ioapic0: Changing APIC ID to 2
> ioapic0 <Version 2.0> irqs 0-23 on motherboard
> 
> [...]
> SMP: AP CPU #1 Launched!
> 
> The kernel is, of course, SMP.
> 
> What can I do, where can I search for solution?
> 
> Second core IS enabled in BIOS
> cluster-one# sysctl hw | grep cpu
> hw.ncpu: 2
> hw.acpi.cpu.cx_supported: C1/0
> hw.acpi.cpu.cx_lowest: C1
> hw.acpi.cpu.cx_usage: 100.00%
> cluster-one# sysctl machdep | grep cpu
> machdep.cpu_idle_hlt: 1
> machdep.hlt_cpus: 2
> machdep.hlt_logical_cpus: 0
> machdep.logical_cpus_mask: 2
> 
> so second CPU is halted, attempt to start it with sysctl does not help
> Alex.

It's seeing it as an HTT thread.  Try 
changing 'machdep.hyperthreading_allowed'.

-- 
John Baldwin