kernel-x64-smp-multiprocessor-time util problem

on dual core amd-athlon under 64bit-smp core

kernel compilation time:

time make -j 8
...
LD [M]  sound/usb/snd-usb-lib.ko
LD [M]  sound/usb/usx2y/snd-usb-usx2y.ko

real    18m0.948s
user    26m6.270s    ------bad
sys     4m22.256s    ------?bad
[xxx@localhost linux-2.6.17]$
--- real-clock time  is ~18 min -- user and system time doubled?

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