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why only one in eight cpu (or cpu threads) works?

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http://forums.fedoraforum.org – hi, there are eight cpus (or say cpu treads) in my computer, I have installed fedora 17 (i686), but only one cpu works, why? see top output below: Tasks: 248 total, 2 running, 246 sleeping, 0 stopped, 0 zombie Cpu(s): 16.4%us, 1.3%sy, 0.0%ni, 81.4%id, 0.8%wa, 0.0%hi, 0.0%si, 0. Mem: 3312468k total, 3114264k used, 198204k free, 3288k buffers Swap: 5406716k total, 1168360k used, 4238356k free, 2381424k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 21145 huwx 20 0 79464 10m 1048 D 21.6 0.3 0:03.38 bowtie 21147 huwx 2 (HowTos)