From owner-freebsd-hackers Wed Jan 28 23:45:08 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id XAA21621 for hackers-outgoing; Wed, 28 Jan 1998 23:45:08 -0800 (PST) (envelope-from owner-freebsd-hackers@FreeBSD.ORG) Received: from hydrogen.nike.efn.org (d182-89.uoregon.edu [128.223.182.89]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id XAA21611 for ; Wed, 28 Jan 1998 23:45:04 -0800 (PST) (envelope-from gurney_j@efn.org) Received: (from jmg@localhost) by hydrogen.nike.efn.org (8.8.7/8.8.7) id XAA26259; Wed, 28 Jan 1998 23:44:58 -0800 (PST) Message-ID: <19980128234458.28130@hydrogen.nike.efn.org> Date: Wed, 28 Jan 1998 23:44:58 -0800 From: John-Mark Gurney To: Luigi Rizzo Cc: Brian Campbell , freebsd-hackers@FreeBSD.ORG Subject: Re: Busmastering code for IDE drives in 2.2.6? References: <19980128185953.56562@pobox.com> <199801290420.FAA05338@labinfo.iet.unipi.it> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.69 In-Reply-To: <199801290420.FAA05338@labinfo.iet.unipi.it>; from Luigi Rizzo on Thu, Jan 29, 1998 at 05:20:25AM +0100 Reply-To: John-Mark Gurney Organization: Cu Networking X-Operating-System: FreeBSD 2.2.1-RELEASE i386 X-PGP-Fingerprint: B7 EC EF F8 AE ED A7 31 96 7A 22 B3 D8 56 36 F4 X-Files: The truth is out there X-URL: http://resnet.uoregon.edu/~gurney_j/ Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG X-To-Unsubscribe: mail to majordomo@FreeBSD.org "unsubscribe hackers" Luigi Rizzo scribbled this message on Jan 29: > 2) about the IDE busmastering code, I still would like to see some > good benchmark result showing when/how it improves performance. > The only comment I have seen (from the author ?) is that it > improves throughput by a few percent under moderate load, but no > data on how it behaves say with concurrent activity on the IDE bus, > or with heavily loaded systems. oh, this is very easy to answer... basicly, run a make -j6 world and you should see a difference in times... the busmastering allows your processor to continue to compile source while the data gets transfered in the background instead of wasting the time using the processor to copy and store the data in memory... -- John-Mark Gurney Modem/FAX: +1 541 683 6954 Cu Networking P.O. Box 5693, 97405 Live in Peace, destroy Micro$oft, support free software, run FreeBSD