From owner-freebsd-hackers Thu Apr 11 13:11:06 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id NAA07127 for hackers-outgoing; Thu, 11 Apr 1996 13:11:06 -0700 (PDT) Received: from labinfo.iet.unipi.it (labinfo.iet.unipi.it [131.114.9.5]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id NAA07120 for ; Thu, 11 Apr 1996 13:11:00 -0700 (PDT) Received: from localhost (luigi@localhost) by labinfo.iet.unipi.it (8.6.5/8.6.5) id WAA15511; Thu, 11 Apr 1996 22:02:12 +0200 From: Luigi Rizzo Message-Id: <199604112002.WAA15511@labinfo.iet.unipi.it> Subject: Re: HDD cpu usage (IDE vs. SCSI). To: bde@zeta.org.au (Bruce Evans) Date: Thu, 11 Apr 1996 22:02:11 +0200 (MET DST) Cc: toor@dyson.iquest.net, bde@zeta.org.au, dutchman@spase.nl, freebsd-hackers@FreeBSD.org, se@zpr.uni-koeln.de In-Reply-To: <199604111957.FAA04906@godzilla.zeta.org.au> from "Bruce Evans" at Apr 12, 96 05:57:28 am X-Mailer: ELM [version 2.4 PL23] Content-Type: text Sender: owner-hackers@FreeBSD.org X-Loop: FreeBSD.org Precedence: bulk > >Also, how comes that a 2X CDROM has such a low speed ? > > Perhaps the drive doesn't buffer it. > > >> SCSI 2.2X CDROM > >> Command overhead is 5655 usec (time_4096 = 9033, time_8192 = 12410) > >> transfer speed is 1.21281e+06 bytes/sec > >> Command overhead is 5670 usec (time_4096 = 9046, time_8192 = 12422) > >> transfer speed is 1.21324e+06 bytes/sec > > It's 14 times faster than mine :-]: WHoops... I read that as 121KB/s instead of 1.2MB/s ... sorry for the confusion! Luigi ==================================================================== Luigi Rizzo Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it Universita' di Pisa tel: +39-50-568533 via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 http://www.iet.unipi.it/~luigi/ ====================================================================