From owner-freebsd-hackers Sun Sep 14 16:06:05 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id QAA08960 for hackers-outgoing; Sun, 14 Sep 1997 16:06:05 -0700 (PDT) Received: from goose.doun.org (doun.org [142.154.6.65]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id QAA08869; Sun, 14 Sep 1997 16:04:42 -0700 (PDT) Received: (from josh@localhost) by goose.doun.org (8.8.7/8.8.7) id TAA23901; Sun, 14 Sep 1997 19:04:37 GMT Message-ID: <19970914190437.02165@doun.org> Date: Sun, 14 Sep 1997 19:04:37 +0000 From: Josh Tiefenbach To: Stefan Esser Cc: hackers@freebsd.org, josh@doun.org Subject: Re: Problems with NCR810/Micropolis disk. References: <19970913204749.41765@doun.org> <19970914233827.50442@mi.uni-koeln.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.81 In-Reply-To: <19970914233827.50442@mi.uni-koeln.de>; from Stefan Esser on Sun, Sep 14, 1997 at 11:38:27PM +0200 Sender: owner-freebsd-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk > > In searching the archives, the I found a post to -scsi circa 12/96 with the > > exact same dmesg output (M_DISCONNEXT) involving an ncr810 and a 9GB > > Micropolis drive, but no solution/explanation was offered. > > Really ? I don't remember having seen such a message ... > Will have to check the archives myself ... Search on -scsi for Joe Greco's post on Dec 10/96 > > > Could this concievably be a hardware problem (ie, should I return the drive), > > or is there something patently obvious that I'm missing? > > Well, I don't know how you measured those 250KB/s > numbers. Could you please run bonnie (from ports) or Bonnie results: -------Sequential Output-------- ---Sequential Input-- --Random-- -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks--- Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU 100 4046 49.4 4104 10.1 1675 6.8 4374 57.2 4661 13.4 87.5 2.8 > send results of "dd" with block sizes of 512 byte, > 4KB and 16KB ? dd results (in all cases, if=/dev/rsd0a of=/dev/null count = 10000) asherah:~# dd if=/dev/rsd0a of=/dev/null bs=512 count=10000 10000+0 records in 10000+0 records out 5120000 bytes transferred in 19.132326 secs (267610 bytes/sec) asherah:~# dd if=/dev/rsd0a of=/dev/null bs=4k count=10000 8192+0 records in 8192+0 records out 33554432 bytes transferred in 18.025235 secs (1861525 bytes/sec) asherah:~# dd if=/dev/rsd0a of=/dev/null bs=16k count=10000 2048+0 records in 2048+0 records out 33554432 bytes transferred in 6.669969 secs (5030673 bytes/sec) Hmmm. I see that with 16k blocksizes, the performance is much better, but the drive still feels `pokey'. -- HARANGUE, n. A speech by an opponent, who is known as an harrangue-outang -- Ambrose Bierce