Subject: Re: Disk performance under NetBSD on A3000
To: None <amiga@NetBSD.ORG>
From: Stephen J. Roznowski <>
List: amiga
Date: 04/24/1995 21:29:12
> From: (Michael L. Hitch)
> On Apr 23,  9:00pm, Michael L. Hitch wrote:
> > On Apr 23,  9:37pm, "Stephen J. Roznowski" 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).
> ...
> >   Trying to compare Sysinfo speeds with a filesystem access using
> > dd is going to be next to meaningless.  A fairer test would be
> > DiskSpeed with 8K buffers.  [Filesystem access is going to use
> > the filesystem buffers, which default to 8K.  Also, the data
> > being written to the disk has to be copied from the process user
> > space to the kernel space buffers, which isn't real efficient either.]
>  Also, the equivalent of what Sysinfo does would probably be:
> 	dd if=/dev/rsd0c of=/dev/null bs=1024k count=10

Just tried that -- got ~2.5Mbytes/sec now. I'm running with an 8K/1K
filesystem. Is a 16k one that much faster?