6.2-RELEASE does not use second CPU?

[Alex Povolotsky]

Hello!

On the Pentium-D box, kernel detects both CPUs, but it seems like 
scheduler use only one.

(from 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,C
MOV,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>
  Logical CPUs per core: 2
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

....

SMP: AP CPU #1 Launched!

(from top)

last pid: 12408;  load averages:  4.99,  4.91,  4.08    up 0+01:08:02  
19:26:23
265 processes: 8 running, 256 sleeping, 1 zombie
CPU states: 35.0% user,  0.0% nice, 14.1% system,  0.9% interrupt, 50.0% 
idle
Mem: 267M Active, 503M Inact, 171M Wired, 29M Cache, 109M Buf, 1636K Free
Swap: 2006M Total, 2006M Free

  PID USERNAME  THR PRI NICE   SIZE    RES STATE  C   TIME   WCPU COMMAND
 1399    125      1 109    0  4684K  2808K RUN    0  11:20 18.85% qmgr
 1819    300      1   4    0 33552K 30824K select 0   8:58 13.57% perl5.8.8
 1821    300      1   4    0 33364K 30644K select 0   9:15  6.05% perl5.8.8
12398    125      1   4    0  3588K  2524K select 0   0:00  2.00% cleanup
 1394 root        1 104    0  3444K  1596K RUN    0   1:58  1.66% master
10601    125      1  97    0  3580K  1728K select 0   0:18  0.83% 
trivial-rewri
10051    125      1  97    0  4536K  2688K RUN    0   0:13  0.63% scache


All processes runs on CPU0, and I did not see less than 50% idle cpu.

What can be wrong?

Alex.