Cpu Usage

System FreeBSD.

Issue: I see that system idle = 0% in the same time top and other commands show that all process eat 0% of cpu.

System calls 98%

CPU states: 7.9% user, 0.0% nice, 91.8% system,<==!!!

But top does not show any process which eats more than 0%

Question: how can I see which processes eat all CPU?