From owner-freebsd-questions Thu Jun 17 16:53:45 1999 Delivered-To: freebsd-questions@freebsd.org Received: from allegro.lemis.com (allegro.lemis.com [192.109.197.134]) by hub.freebsd.org (Postfix) with ESMTP id 8067E15574 for ; Thu, 17 Jun 1999 16:53:28 -0700 (PDT) (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 JAA07194; Fri, 18 Jun 1999 09:23:28 +0930 (CST) Received: (from grog@localhost) by freebie.lemis.com (8.9.3/8.9.0) id JAA82374; Fri, 18 Jun 1999 09:23:37 +0930 (CST) Date: Fri, 18 Jun 1999 09:23:37 +0930 From: Greg Lehey To: mike@hyperreal.org Cc: freebsd-questions@freebsd.org Subject: Re: Optimizing IDE performance revisited Message-ID: <19990618092337.O9893@freebie.lemis.com> References: <19990618083444.D9893@freebie.lemis.com> <19990617234453.6730.qmail@hyperreal.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.95.4i In-Reply-To: <19990617234453.6730.qmail@hyperreal.org>; from mike@hyperreal.org on Thu, Jun 17, 1999 at 04:44:53PM -0700 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, 17 June 1999 at 16:44:53 -0700, mike@hyperreal.org wrote: > Greg Lehey wrote: >>>> My controller is capable of PIO mode 3 (11.1 MB/s in theory). No info about DMA >>>> modes. My question is: is this as optimized as it can be, or no? I haven't >>>> really noticed an improvement, is why I ask. >> >> What does your dmesg output say? You should get something like: >> >> wdc0 at 0x1f0-0x1f7 irq 14 flags 0xa0ffa0ff on isa >> wdc0: unit 0 (wd0): , DMA, 32-bit, multi-block-16 >> >> If you get the "DMA" message, then your chipset does support DMA. >> Otherwise it'll fall back to PIO. > > Ahhhh, thanks! > > wdc0 at 0x1f0-0x1f7 irq 14 flags 0xb0ffb0ff on isa > wdc0: CMD640B workaround enabled > wdc0: unit 0 (wd0): , LBA, multi-block-16 > wd0: 1625MB (3329424 sectors), 825 cyls, 64 heads, 63 S/T, 512 B/S > wdc0: unit 1 (wd1): , LBA, multi-block-16 > wd1: 1625MB (3329424 sectors), 825 cyls, 64 heads, 63 S/T, 512 B/S > > So, I'd assume this means, no DMA. I'm afraid so. > Now this is odd. The BIOS is set to enable 32-bit transfers. > Wonder why it's not coming up here like it is on yours. It's a feature of the controller chip set. Yours obviously doesn't support DMA. > Thanks for all the info. You're welcome. 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