 | | | One CPU idle | One CPU idle 2005-01-23 - By dsavage@(protected)
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My RHEL3/ELu4 system appears to be confused about the number of CPUs it
should be running.
The first CPU is detected at boot time (naturally), but dmesg throws an
error message from smpboot (see last line of this fragment):
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 512K (64 bytes/line)
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
CPU: After generic, caps: 0383fbff c1cbfbff 00000000 00000000
CPU: Common caps: 0383fbff c1cbfbff 00000000 00000000
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Checking 'hlt' instruction... OK.
POSIX conformance testing by UNIFIX
mtrr: v1.40 (20010327) Richard Gooch (rgooch@(protected))
mtrr: detected mtrr type: Intel
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 512K (64 bytes/line)
Intel machine check reporting enabled on CPU#0.
CPU: After generic, caps: 0383fbff c1cbfbff 00000000 00000000
CPU: Common caps: 0383fbff c1cbfbff 00000000 00000000
CPU0: AMD Athlon(tm) MP 2800+ stepping 00
per-CPU timeslice cutoff: 1462.85 usecs.
task migration cache decay timeout: 10 msecs.
masked ExtINT on CPU#0
ESR value before enabling vector: 00000000
ESR value after enabling vector: 00000000
Booting processor 1/0 eip 2000
Not responding.
Error: only one processor found.
This is reflected in /proc/cpuinfo, where only CPU0 is reported. But the
second CPU is detected in the BIOS, as /usr/sbin/dmidecode correctly
shows:
Handle 0x0004
DMI type 4, 32 bytes.
Processor Information
Socket Designation: CPU0
Type: Central Processor
Family: Athlon
Manufacturer: AuthenticAMD
ID: A0 06 00 00 FF FB 83 03
Signature: Type 0, Family 6, Model A, Stepping 0
...
Handle 0x0005
DMI type 4, 32 bytes.
Processor Information
Socket Designation: CPU1
Type: Central Processor
Family: Athlon
Manufacturer: GenuineIntel
ID: A0 06 00 00 FF FB 83 03
Signature: Type 0, Family 6, Model A, Stepping 0
(dmidecode appears to have a minor bug in the Manufacturer: line for CPU1.)
This is a Tyan S2468UGN system that correctly boots and runs two CPUs when
the OS is FC3, RHEL4ES/b2, and even when I boot the Helix 1.5 forensics
CD. I'm running the SMP kernel, and I've tried adding "maxcpus=2" to the
GRUB command line, but to no effect.
Would any boot-time wizards care to guess what is causing this system to
run on only one CPU?
--Doc Savage
Fairview Heights, IL
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