could you post the results for running iozone on a raw device too?
on my ds5000/200, raw device writes are 50% slower since the integration
of thorpej_scsipi vs. 1.5 (with the MI SCSI in both cases).

also, could you give some more info about your setup, such as how much
memory in your machine and the parameters you use to run iozone?

-Chuck


On Thu, Aug 23, 2001 at 05:26:16PM +0900, Toru Nishimura wrote:
> > were these iozone runs done with a filesystem or on a raw device?
> 
> It's FFS.
> 
> > if it was with a filesystem, you could also try a run with the performence
> > enhancements I've been working on:
> > 
> > ftp://ftp.netbsd.org/pub/NetBSD/misc/chs/ubc-perf/
> > 
> > grab the latest diff, put the new genfs_node.h file in sys/miscfs/genfs,
> > rebuild.  this improves filesystem performance dramatically on old, slow
> > machines.
> 
> I've compiled and measured.
> 
> K48     1.5K compiled at 2000-11-21
> X1      1.5X                 -08-22
> CHS0	1.5X                 -08-23
> 
>           K48           X1              CHS0
> W sec.  36.38           72.98           71.43
> R sec.  29.79           38.27           35.10
> 
> W B/s   1,152,914         553,411         587,190
> R B/s   1,407,957       1,083,799       1,194,958
> 
> CHS0 performance shows very little fluctuation, less than 0.7% this
> time.
> 
> It's known that the combination of 25MHz R3000A and LPS540S yields
> 1,700,000+ B/s on raw write and 2,300,000+ B/s on raw read.  Raw I/O
> performance figures are consistent between K48 and CHS0, despite of
> modifications of MI NCR53C9x SCSI driver and new SCSIPI layer.
> 
> According to the output of vmstat 1, the kernel emits 150+ page faults
> every second.
> 
> Tohru Nishimura