On Tue, Aug 28, 2007 at 09:36:26AM -0500, Oleg Nauman wrote: > On Tue, Aug 28, 2007 at 12:48:13PM +0800, Ganbold wrote: > > Kostik Belousov wrote: > > >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. > > > > > > > What would be a solution to this kind of problems? > > From my point of view it exhibits some issues with standard SCHED_4BSD > scheduler in the 7.0 (my laptop is mostly unusable during 'make buildworld' > for example - keyboard exhibits lost event sometimes, sound is jerking etc etc). > So I'm switched to SHED_ULE on my UP laptop; it was helpful. I'm running > custom kernel without debug options though. SCHED_ULE also exhibit the behaviour, but in lesser degree. Due to this, I suspect that the problem in the common code. Jeff, any suggestions ?
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