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When you're looking at top then you can definetely see which process(es) are 'eating up' your CPU. If it's constantly at 100% then you do have a problem. You can try restarting the process that's consuming all CPU and see if that helps. Providing more information about what process(es) are putting it at 100% would be very usefull.
That's hard to say if you don't specify which process is putting your CPU at 100%. Can you post some output of the top command or at least which process is consuming your CPU as asked in my previous post?
Are we actually talking about a single cpu/core or multiple cpu's/cores? I've seen top show 390% cpu usage on a quad core cpu.
Top shows single state by default (all cpu's/cores together), press 1 (one) to see separate view. As syg00 already mentioned, rounding "errors" do make it possible to show slightly over a 100% for 1 specific cpu.
Perhaps one process is thrashing one core, and the other(s) is (are) experiencing idle activity? Rarely is a CPU truly at rest...
As for me, top averages the loads of the virtual cores into a single "system load" indicator, i.e. it shows around 25% when one virtual core is totally busy. I say "virtual" because this system's CPU is an Intel Core i5, which is multithreaded dual-core. Two physical cores, but the OS sees four.