Performance of 4.x vs 5.x (Re: Lifetime of FreeBSD branches)

Kris Kennaway kris at
Tue May 24 09:40:44 PDT 2005

On Tue, May 24, 2005 at 06:32:28PM +0200, Matthias Buelow wrote:
> Freddie Cash wrote:
> > The laptop has an ATI IXP chipset, which means the HD is detected and run 
> > as a generic UDMA33 device.  The kernel is using the 4BSD scheduler with 
> > PREEMPTION enabled, all debugging hints disabled, and all the mpsafe 
> > sysctls enabled.
> Hmm.. maybe the disk (interface) is just too slow to trigger this when
> running in UDMA33 (and a slow notebook disk).. I have observed it on a
> SATA Seagate setup (on ICH6 chipset).  Just a wild guess.

I'd expect a slow disk to make worse the problem of blocking waiting
for disk I/O.

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