From owner-freebsd-current Sun Feb 28 18: 4:36 1999 Delivered-To: freebsd-current@freebsd.org Received: from allegro.lemis.com (allegro.lemis.com [192.109.197.134]) by hub.freebsd.org (Postfix) with ESMTP id 46693151C3 for ; Sun, 28 Feb 1999 18:04:30 -0800 (PST) (envelope-from grog@freebie.lemis.com) Received: from freebie.lemis.com (freebie.lemis.com [192.109.197.137]) by allegro.lemis.com (8.9.1/8.9.0) with ESMTP id MAA17496; Mon, 1 Mar 1999 12:34:11 +1030 (CST) Received: (from grog@localhost) by freebie.lemis.com (8.9.3/8.9.0) id MAA15598; Mon, 1 Mar 1999 12:34:06 +1030 (CST) Message-ID: <19990301123406.Y7279@lemis.com> Date: Mon, 1 Mar 1999 12:34:06 +1030 From: Greg Lehey To: Tugrul , freebsd-current@FreeBSD.ORG Subject: Re: SiS 5591 References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.93.2i In-Reply-To: ; from Tugrul on Sun, Feb 28, 1999 at 01:51:45AM -0500 WWW-Home-Page: http://www.lemis.com/~grog Organization: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-41-739-7062 Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Sunday, 28 February 1999 at 1:51:45 -0500, Tugrul wrote: > > Seems to work alright here. dmesg and dd tests follow. > > [before] > mercury# dd if=/dev/zero of=/tmp/zero bs=1024k count=32 > 32+0 records in > 32+0 records out > 33554432 bytes transferred in 6.013635 secs (5579725 bytes/sec) > mercury# > > [after] > mercury# dd if=/dev/zero of=/tmp/zero bs=1024k count=32 > 32+0 records in > 32+0 records out > 33554432 bytes transferred in 5.892770 secs (5634706 bytes/sec) > mercury# > > Not much gain with this drive :/ You shouldn't use files to this kind of test. The buffer cache will falsify the results, especially on relatively small transfers. Try a dd to (or from :-) the raw device. The other thing is, of course, that you can't transfer faster than the disk will allow. If you can do that in PIO mode, you won't get any speed improvement with DMA. What you *will* get is a significant drop in CPU load. > Copyright (c) 1992-1999 FreeBSD Inc. > Copyright (c) 1982, 1986, 1989, 1991, 1993 > The Regents of the University of California. All rights reserved. > FreeBSD 3.1-STABLE #0: Sun Feb 28 01:32:47 EST 1999 > galatalt@mercury.novastar.com:/usr/src/sys/compile/MERCURY > Timecounter "i8254" frequency 1193225 Hz > CPU: Pentium/P55C (166.45-MHz 586-class CPU) > Origin = "GenuineIntel" Id = 0x543 Stepping=3 > Features=0x8001bf Could you send me the output of a verbose boot, please? Greg -- See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message