Subject: Re: Disk performance under NetBSD on A3000
To: None <amiga@NetBSD.ORG>
From: Stephen Champion <email@example.com>
Date: 04/24/1995 02:50:18
Michael L. Hitch said:
> 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.]
I am experiencing poor disk performance under NetBSD as well.
I've thought about using tunefs but am unsure of how to find a good
rotational delay. Is 0 a good value for faster drives (ie Quantum LPS
and/or Quantum Empire)? How should the rotdelay be calculated, anyway?
It would be nice if the tunefs (8) man page included such information.
// Stephen Champion Software Eng, *ix Admin, OS Design
// firstname.lastname@example.org Hampshire College - Amherst, MA
// email@example.com Amiga 3000/25 NetBSD 1.0
#define Disclaimer "This product is completely without warranty."