On Apr 24, 12:50pm, Arthur Hoffmann wrote:
> > I'm seeing poor disk performance under NetBSD-current on my A3000.
> > Under ADOS, I see about 1.7-2.0 megabytes per second (via sysinfo)
> > while under NetBSD, I see about 500 kilobytes per second
> > (dd if=/dev/zero of=zzzzz bs=1024k count=10).
> > 
> > What disk performance numbers are others seeing?
> > 
> > Thanks,
> > -SR
> > 
> 
> Under Ados I get 3.1M/sec (Quantum Empire 2.1G) under NetBSD I get :
> 
> root@atze(306)$ dd if=/dev/zero of=zzzzz bs=1024k count=10
> 10+0 records in
> 10+0 records out
> 10485760 bytes transferred in 23 secs (455902 bytes/sec)
>  :(

  A question for both Stephen and Arthur - what is the rotational
delay between contiguous blocks for your file system?  I tried dd
on an older partition (and a slower disk) and got 455902 bytes/sec.
After using tunefs to set the rotational delay to 0, I got 1048576
bytes/sec.  [The old default for newfs was 4ms for the rotational
delay - which is not a good default for current SCSI drives.]

Michael

-- 
Michael L. Hitch			INTERNET:  osymh@montana.edu
Computer Consultant
Office of Systems and Computing Services
Montana State University	Bozeman, MT	USA