From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <384F17BA.174B4C6D@mandrakesoft.com> Date: Wed, 08 Dec 1999 21:45:14 -0500 From: Jeff Garzik MIME-Version: 1.0 Subject: Re: Getting big areas of memory, in 2.3.x? References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Alan Cox Cc: Linux Kernel List , linux-mm@kvack.org List-ID: Alan Cox wrote: > > > What's the best way to get a large region of DMA'able memory for use > > with framegrabbers and other greedy drivers? > > Do you need physically linear memory > Yes. For the Meteor-II grabber I don't think so, but it looks like the older (but mostly compatible) Corona needs it. > > Per a thread on glx-dev, Andi Kleen mentions that the new 2.3.x MM stuff > > still doesn't allieviate the need for bigphysarea and similar patches. > > It helps, however the best answer is to use sane hardware which has scatter > gather - eg the bttv frame grabbers grab 1Mb of memory or more, but they > grab it as arbitary pages not a linear block. That's the easy answer too :) -- Jeff Garzik | Just once, I wish we would encounter Building 1024 | an alien menace that wasn't immune to MandrakeSoft, Inc. | bullets. -- The Brigadier, "Dr. Who" -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://humbolt.geo.uu.nl/Linux-MM/