Subject: Re: Disk performance under NetBSD on A3000
To: None <firstname.lastname@example.org>
From: Stephen J. Roznowski <email@example.com>
Date: 04/24/1995 21:36:39
> From: firstname.lastname@example.org (Michael L. Hitch)
> 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.]
Set to 4ms. I'll try setting to 0 and retesting.