Date: Wed, 28 Jan 1998 23:44:58 -0800 From: John-Mark Gurney <gurney_j@efn.org> To: Luigi Rizzo <luigi@labinfo.iet.unipi.it> Cc: Brian Campbell <bac@sympatico.ca>, freebsd-hackers@FreeBSD.ORG Subject: Re: Busmastering code for IDE drives in 2.2.6? Message-ID: <19980128234458.28130@hydrogen.nike.efn.org> In-Reply-To: <199801290420.FAA05338@labinfo.iet.unipi.it>; from Luigi Rizzo on Thu, Jan 29, 1998 at 05:20:25AM %2B0100 References: <19980128185953.56562@pobox.com> <199801290420.FAA05338@labinfo.iet.unipi.it>
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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
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