From owner-freebsd-stable Sun Feb 28 19:58:37 1999 Delivered-To: freebsd-stable@freebsd.org Received: from mail.HiWAAY.net (fly.HiWAAY.net [208.147.154.56]) by hub.freebsd.org (Postfix) with ESMTP id DF743152B1 for ; Sun, 28 Feb 1999 19:58:14 -0800 (PST) (envelope-from dkelly@nospam.hiwaay.net) Received: from nospam.hiwaay.net (tnt8-216-180-15-202.dialup.HiWAAY.net [216.180.15.202]) by mail.HiWAAY.net (8.9.1a/8.9.0) with ESMTP id VAA24454 for ; Sun, 28 Feb 1999 21:57:56 -0600 (CST) Received: from nospam.hiwaay.net (localhost [127.0.0.1]) by nospam.hiwaay.net (8.9.2/8.9.2) with ESMTP id VAA00388 for ; Sun, 28 Feb 1999 21:57:44 -0600 (CST) (envelope-from dkelly@nospam.hiwaay.net) Message-Id: <199903010357.VAA00388@nospam.hiwaay.net> X-Mailer: exmh version 2.0.2 2/24/98 To: freebsd-stable@freebsd.org From: David Kelly Subject: rc5des slows tape thruput In-reply-to: Message from Matthew Jacob of "Fri, 26 Feb 1999 10:06:58 PST." Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Sun, 28 Feb 1999 21:57:44 -0600 Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Mentioned the other day that I thought tape operations were slower these days than in the past. Booted my 2.2.5-RELEASE CD's and flipped over to the live filesystem to test. Used: dd if=/dev/zero bs=10k count=1000 of=/dev/rst0 In 12 runs on both DDS-1 and DDS-2 tapes got 349k/sec to 376k/sec. Didn't seem to matter which type type. Compression is jumpered off. These are the expected data rates I have seen in the past, but haven't seen recently. Booted single user into 3.0-current (as of Jan 30). Got similar results. And the same yet when multiuser doing the test as myself. But Friday night was getting half this thruput. Fired up X and repeated. Essentially the same results. Then fired up rc5des, which is niced and fell to an average of 185k/sec. Snipped from top: 294 dkelly 105 20 740K 520K RUN 9:58 97.95% 97.95% rc5des This behavior does not seem reasonable in an OS with FreeBSD's repute. System is a PPro-166/512k OC'ed to 210. Tape drive is on: ahc0: rev 0x00 int a irq 15 on pci0.9.0 ahc0: aic7870 Single Channel A, SCSI Id=7, 16/255 SCBs sa0 at ahc0 bus 0 target 5 lun 0 sa0: Removable Sequential Access SCSI-2 device sa0: 5.0MB/s transfers (5.0MHz, offset 15) -- David Kelly N4HHE, dkelly@nospam.hiwaay.net ===================================================================== The human mind ordinarily operates at only ten percent of its capacity -- the rest is overhead for the operating system. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message