From owner-freebsd-questions Thu Sep 16 17:45:50 1999 Delivered-To: freebsd-questions@freebsd.org Received: from freebie.lemis.com (freebie.lemis.com [192.109.197.137]) by hub.freebsd.org (Postfix) with ESMTP id ABBA0157E2 for ; Thu, 16 Sep 1999 17:45:42 -0700 (PDT) (envelope-from grog@freebie.lemis.com) Received: (from grog@localhost) by freebie.lemis.com (8.9.3/8.9.0) id KAA61558; Fri, 17 Sep 1999 10:15:33 +0930 (CST) Date: Fri, 17 Sep 1999 10:15:33 +0930 From: Greg Lehey To: Volker Stolz Cc: FreeBSD Questions Subject: Re: Erratic SCSI-ZIP throughput Message-ID: <19990917101533.O55065@freebie.lemis.com> References: <19990909123919.A6053@solo.informatik.rwth-aachen.de> <19990912114608.U10106@freebie.lemis.com> <19990914151601.A378@solo.informatik.rwth-aachen.de> <19990915083028.A30655@freebie.lemis.com> <19990916153731.C9119@solo.informatik.rwth-aachen.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.95.4i In-Reply-To: <19990916153731.C9119@solo.informatik.rwth-aachen.de>; from Volker Stolz on Thu, Sep 16, 1999 at 03:37:31PM +0200 WWW-Home-Page: http://www.lemis.com/~grog X-PGP-Fingerprint: 6B 7B C3 8C 61 CD 54 AF 13 24 52 F8 6D A4 95 EF 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-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Thursday, 16 September 1999 at 15:37:31 +0200, Volker Stolz wrote: >>>> There's a certain amount of overhead involved in copying a file, and I >>>> suspect that what you're seeing is related, especially if the big >>>> files are moving fast. What does iostat show? I don't know the >>>> specs, but I'd expect about 30 to 50 transfers a second for a Zip >>>> drive. >>> >>> You're right, it shows 48 tps and 0.09 M/s. But hell, that's too slow! At least compared >>> with acceses from Win{NT,98} to the same drive. >> >> It depends on what transfers you're doing. If you're transferring .09 >> MB in 48 transfers, your average transfer size is about 2 kB. You >> should be able to do better than that on an average mix. > > I know, but what goes wrong? Nothing goes wrong. You're running into a basic limitation of the device. Greg -- When replying to this message, please copy the original recipients. For more information, see http://www.lemis.com/questions.html 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-questions" in the body of the message