microcode_ctl input/output error

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I am using Fedora 1, kernel 2.4.22-1.2129.nptlsmp. Dual Xeon 2.8Ghz.

# /sbin/microcode_ctl -u
/sbin/microcode_ctl: writing microcode (length: 141312)
/sbin/microcode_ctl: error writing to '/dev/cpu/0/microcode' errno=5 (Input/output error)
/sbin/microcode_ctl: there may be messages from the driver in your system log.

But 'cat /var/log/messages' immediately after the above line does not contain any microcode_ctl related error messages. The microcode used is /etc/firmware/microcode.dat.

Durnig bootup, the screen shows "Applying Intel IA32 Microcode update: [ OK ]". But it is actually an error, because the startup script use -Q switch (run silently even on failure).

For now I have disabled applying microcode at startup. Is it important to apply microcode? Any fix to this error?

Regards, Zhi Min

PS: Some info, if it helps:

# ll /dev/cpu/0/microcode
crw------- 1 root root 10, 184 Sep 15 21:40 /dev/cpu/0/microcode

# cat /dev/cpu/0/microcode
<nothing shows up>

# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 2
model name : Intel(R) Xeon(TM) CPU 2.80GHz
stepping : 9
cpu MHz : 2786.401
cache size : 512 KB
physical id : 0
siblings : 2
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : 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 ht tm pbe cid
runqueue : 0

bogomips        : 5557.45

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