On Mon, Aug 27, 2007 at 11:14:58PM +0100, Robert Watson wrote: > > On Mon, 27 Aug 2007, Ganbold wrote: > > >I'm running FreeBSD 7.0-CURRENT with SCHED_ULE, INVARIANTS, WITNESS > >enabled kernel. > > Try the same thing again without INVARIANTS and WITNESS, both of which can > consume a lot of CPU in kernel on a very active system, especially if lots > of vnodes are being allocated and freed. Especially WITNESS. It does happens on the kernels without debug options, in particular, WITNESS and INVARIANTS. It happens when a lot of short-lived processes are rapidly created. Compilation is a good example of such workload; running configure script is even better.
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