From owner-freebsd-hardware Fri Mar 6 15:13:05 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id PAA09531 for freebsd-hardware-outgoing; Fri, 6 Mar 1998 15:13:05 -0800 (PST) (envelope-from owner-freebsd-hardware@FreeBSD.ORG) Received: from george.lbl.gov (george-2.lbl.gov [131.243.2.12]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id PAA09521 for ; Fri, 6 Mar 1998 15:12:59 -0800 (PST) (envelope-from jin@george.lbl.gov) Received: (from jin@localhost) by george.lbl.gov (8.8.8/LBL-ITG) id PAA20256; Fri, 6 Mar 1998 15:12:58 -0800 (PST) Date: Fri, 6 Mar 1998 15:12:58 -0800 (PST) From: Jin Guojun (ITG staff) Message-Id: <199803062312.PAA20256@george.lbl.gov> To: roberto@keltia.freenix.fr Subject: Re: TX Chipset and more than 64M Ram Cc: hardware@FreeBSD.ORG Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org >> I tested under this environment, the performance is K6-200. Also, the memory >> performance is better then under BIOS 205 (the latest one) because -- >> that under BIOS 109, the K6 FPU looks like 64-bits, >> but under BIOS 205, K6 FPU looks like 32-bits. It is very interesting. > >But no one uses the BIOS under FreeBSD... What do you call "looks like >64-bits" ? Using double (float) register do memory copy compare with using integer (32b) register, you will see the difference. K6 under BIOS 109: int register to memory copy: 57MBps double register to memory copy: 110MBps K6 under BIOS 205: int register to memory copy: 68MBps double register to memory copy: 74MBps Intel under both BIOS: int register to memory copy: 88MBps double register to memory copy: 175MBps So, there is some tricky to increase memory performance for AMD K6 under FreeBSD. -Jin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message