low(er) disk performance with sched_4bsd then with sched_ule

Kris Kennaway kris at obsecurity.org
Fri Sep 16 08:24:04 PDT 2005

On Fri, Sep 16, 2005 at 04:37:26PM +0200, Oliver Lehmann wrote:
> Hi Kris,
> Kris Kennaway wrote:
> > What about using schedgraph as I suggested previously?
> After I installed py24-tkinter and all the dependencies, I recompiled the kernel and so on, but it seems not to work:
> root at nudel olivleh1> dd if=/dev/zero of=/mnt/files/test.dd bs=64k count=32000
> 32000+0 records in
> 32000+0 records out
> 2097152000 bytes transferred in 379.623777 secs (5524290 bytes/sec)
> root at nudel olivleh1> ktrdump -ct > ule.ktr.out
> root at nudel olivleh1> grep ULE /usr/src/sys/i386/conf/NUDEL 
> options         SCHED_ULE

And you enabled the correct KTR options in your kernel, right?

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