Today, I converted my production system from NetBSD 1.2G (August
1997 -current) to NetBSD 1.3.2.

Every night, I do automated dumps of my key filesystems to a cheap
9GB Micropolis disk. An E-mail message from the cron job gives me
the results.

I looked at tonight's results with interest - I was hoping that
1.3.2 would be an improvement over 1.2G. Alas, it wasn't. The
principal difference in the SCSI stuff (code differences aside) is
that the select/reselect stuff is on in 1.3.2 and was off in 1.2G.

The last dump of these 2GB filesystems under 1.2G:

  DUMP: Volume 1 started at: Sat Sep 12 03:00:59 1998
  DUMP: DUMP: 1999147 tape blocks on 1 volume
  DUMP: Volume 1 completed at: Sat Sep 12 03:44:36 1998
  DUMP: Volume 1 took 0:43:37
  DUMP: Volume 1 transfer rate: 763 KB/s
  DUMP: Date of this level 0 dump: Sat Sep 12 03:00:28 1998
  DUMP: Date this dump completed:  Sat Sep 12 03:44:36 1998
  DUMP: Average transfer rate: 763 KB/s

  DUMP: Volume 1 started at: Sat Sep 12 03:45:21 1998
  DUMP: DUMP: 1921010 tape blocks on 1 volume
  DUMP: Volume 1 completed at: Sat Sep 12 04:19:42 1998
  DUMP: Volume 1 took 0:34:21
  DUMP: Volume 1 transfer rate: 932 KB/s
  DUMP: Date of this level 0 dump: Sat Sep 12 03:44:37 1998
  DUMP: Date this dump completed:  Sat Sep 12 04:19:42 1998
  DUMP: Average transfer rate: 932 KB/s

The first dump of the same filesystems under 1.3.2

  DUMP: Volume 1 started at: Sun Sep 13 03:00:58 1998
  DUMP: 2014279 tape blocks on 1 volume
  DUMP: Volume 1 completed at: Sun Sep 13 03:48:35 1998
  DUMP: Volume 1 took 0:47:37
  DUMP: Volume 1 transfer rate: 705 KB/s
  DUMP: Date of this level 0 dump: Sun Sep 13 03:00:28 1998
  DUMP: Date this dump completed:  Sun Sep 13 03:48:35 1998
  DUMP: Average transfer rate: 705 KB/s

  DUMP: Volume 1 started at: Sun Sep 13 03:49:29 1998
  DUMP: 1921867 tape blocks on 1 volume
  DUMP: Volume 1 completed at: Sun Sep 13 04:29:44 1998
  DUMP: Volume 1 took 0:40:15
  DUMP: Volume 1 transfer rate: 795 KB/s
  DUMP: Date of this level 0 dump: Sun Sep 13 03:48:36 1998
  DUMP: Date this dump completed:  Sun Sep 13 04:29:44 1998
  DUMP: Average transfer rate: 795 KB/s

A fairly substantial drop. Any bets on whether this will come back
if I turn off the select/reselect stuff for these disks?

	Erik E. Fair	fair@clock.org