low(er) disk performance with sched_4bsd then with sched_ule

Kris Kennaway kris at obsecurity.org
Fri Sep 16 08:47:30 PDT 2005


On Fri, Sep 16, 2005 at 05:44:31PM +0200, Oliver Lehmann wrote:
> Kris Kennaway wrote:
> 
> > On Fri, Sep 16, 2005 at 05:39:32PM +0200, Oliver Lehmann wrote:
> > > Kris Kennaway wrote:
> > > 
> > > > And you enabled the correct KTR options in your kernel, right?
> > > 
> > > options KTR
> > > options KTR_COMPILE=KTR_SCHED
> > > options KTR_MASK
> > 
> > options KTR_MASK=KTR_SCHED, per the instructions in schedgraph.py
> 
> "Add KTR_SCHED to KTR_COMPILE and KTR_MASK in your KERNCONF" would be
> easier to parse if exaclty would be written down what should be placed
> into KERNCONF instead of describing it :/

It should be parsed as

"Add KTR_SCHED to (KTR_COMPILE and KTR_MASK) ..."

Since the user may already have ktr configured with other events, this
is about the best you can do.  See the ktr manpage for more
documentation if you need it.

Kris
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