From owner-freebsd-current Mon Aug 3 12:28:35 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id MAA22471 for freebsd-current-outgoing; Mon, 3 Aug 1998 12:28:35 -0700 (PDT) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from smtp01.primenet.com (smtp01.primenet.com [206.165.6.131]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id MAA22384 for ; Mon, 3 Aug 1998 12:28:21 -0700 (PDT) (envelope-from tlambert@usr07.primenet.com) Received: (from daemon@localhost) by smtp01.primenet.com (8.8.8/8.8.8) id MAA26500; Mon, 3 Aug 1998 12:27:54 -0700 (MST) Received: from usr07.primenet.com(206.165.6.207) via SMTP by smtp01.primenet.com, id smtpd026475; Mon Aug 3 12:27:52 1998 Received: (from tlambert@localhost) by usr07.primenet.com (8.8.5/8.8.5) id MAA01657; Mon, 3 Aug 1998 12:27:49 -0700 (MST) From: Terry Lambert Message-Id: <199808031927.MAA01657@usr07.primenet.com> Subject: Re: IO performance (UFS read clustering), bad ZIP drive performance To: bde@zeta.org.au (Bruce Evans) Date: Mon, 3 Aug 1998 19:27:49 +0000 (GMT) Cc: current@FreeBSD.ORG, rock@cs.uni-sb.de In-Reply-To: <199808030726.RAA16337@godzilla.zeta.org.au> from "Bruce Evans" at Aug 3, 98 05:26:02 pm X-Mailer: ELM [version 2.4 PL25] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > >I get unacceptable performance from my SCSI ZIP drive (compared to other > >operating systems). While UFS writing is OK (up to the capabilities of the > >drive: 600-1000 kB/s), everything else (UFS read, MSDOSFS r/w, mtools) > >is extremely slow (down to 80 kB/s). > > ufs clustered reads have been broken (except on wd drives) since rev.1.18 > (1998/01/24) of ufs_bmap.c. SCSI ZIPs have a huge command overhead > (20 msec here on an ncr 53c810) and don't seem to support tags, so > performance without clustering is poor. > > Fix: Is there a particula reason you are posting this to -current instead of to the CVS tree? Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message