Subject: Re: Disk performance under NetBSD on A3000
To: Arthur Hoffmann <email@example.com>
From: Michael L. Hitch <firstname.lastname@example.org>
Date: 04/23/1995 23:21:47
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 L. Hitch INTERNET: email@example.com
Office of Systems and Computing Services
Montana State University Bozeman, MT USA