Before the change, idle system, "echo performance 
>/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor" to both HT logical CPUs:
[EMAIL PROTECTED]:~# time for i in $(seq 100); do modprobe -q foobar; done

real    0m8.720s
user    0m8.357s
sys     0m0.348s

after the change:
[EMAIL PROTECTED]:~# time for i in $(seq 100); do modprobe -q foobar; done

real    0m6.792s
user    0m6.480s
sys     0m0.288s

-- 
SRU: We could make modprobe less slow by building it with proper CFLAGS
https://bugs.launchpad.net/bugs/276096
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