On Mon, 12 Nov 2007 13:48:58 +0100
Joerg Sonnenberger <joerg@britannica.bec.de> wrote:

> On Mon, Nov 12, 2007 at 02:44:40PM +0200, Jukka Marin wrote:
> > On Mon, Nov 12, 2007 at 01:16:39PM +0100, Joerg Sonnenberger wrote:
> > > Have you tried using a different IO scheduler?
> > 
> > No, but I'm willing to try.
> 
> Look for BUFQ_PRIOCSCAN and BUFQ_READPRIO in GENERIC. They are not
> enabled by default. kern.bufq.strategies lists the available strategies.
> 
> > # dkctl ld1 strategy
> > dkctl: /dev/rld1d: DIOCGSTRATEGY: Inappropriate ioctl for device
> 
> I don't know whether a driver has to do anything to get this, others can
> comment on that I guess.

The driver needs to handle the ioctls. At this moment only wd(4)
and cd(4) are using them, iirc.

-- 
Juan Romero Pardines	- The NetBSD Project
http://plog.xtrarom.org	- NetBSD/pkgsrc news in Spanish