From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <199908122005.WAA00317@piglet.cpu.lu> Date: Thu, 12 Aug 1999 22:05:47 +0200 (CEST) From: Michel Lanners Reply-To: mlan@cpu.lu Subject: Re: Trying a Promise Ultra/66 on powerpc To: drow@false.org cc: linuxppc-dev@lists.linuxppc.org In-Reply-To: <19990808232621.B352@them.org> MIME-Version: 1.0 Content-Type: TEXT/plain; CHARSET=US-ASCII Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: On 8 Aug, this message from Daniel Jacobowitz echoed through cyberspace: > On Sun, Aug 08, 1999 at 09:54:12PM +0200, Michel Lanners wrote: >> >> > /dev/hdc: >> >> > Timing buffered disk reads: 32 MB in 5.83 seconds = 5.49 MB/sec >> ;-)) How about this: >> >> /dev/hde: >> Timing buffered disk reads: 64 MB in 6.60 seconds = 9.70 MB/sec >> Maxtor 91024D4; 10G 7200 RPM, UDMA-2 ie 33 MB/s. > > Eek. I want that :) No, you'd rather want _this_: /dev/hda: Timing buffered disk reads: 64 MB in 4.67 seconds =13.70 MB/sec bonnie looks even more impressive: -------Sequential Output-------- ---Sequential Input-- --Random-- -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks--- Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU max 200 12816 86.2 12382 38.7 5104 32.4 12365 84.6 20219 50.6 156.4 2.7 This is still with the Maxtor drive, but with forcing the burst bit enabled: PDC202XX_FORCE_BURST_BIT=y I suppose this changes the way data is transfered across the PCI bus, making the Promise send bursts of data rather than single longs. So try it for yourself.... Michel ------------------------------------------------------------------------- Michel Lanners | " Read Philosophy. Study Art. 23, Rue Paul Henkes | Ask Questions. Make Mistakes. L-1710 Luxembourg | email mlan@cpu.lu | http://www.cpu.lu/~mlan | Learn Always. " [[ This message was sent via the linuxppc-dev mailing list. Replies are ]] [[ not forced back to the list, so be sure to Cc linuxppc-dev if your ]] [[ reply is of general interest. Please check http://lists.linuxppc.org/ ]] [[ and http://www.linuxppc.org/ for useful information before posting. ]]