Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 12 Apr 2002 07:35:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 12 Apr 2002 07:35:11 -0400 Received: from parcelfarce.linux.theplanet.co.uk ([195.92.249.252]:51470 "EHLO www.linux.org.uk") by vger.kernel.org with ESMTP id ; Fri, 12 Apr 2002 07:35:10 -0400 Date: Fri, 12 Apr 2002 12:35:09 +0100 From: "Dr. David Alan Gilbert" To: "Pedro M. Rodrigues" Cc: linux-kernel@vger.kernel.org Subject: Re: Using video memory as system memory Message-ID: <20020412113509.GB16692@gallifrey> In-Reply-To: <3CB6D965.27604.10B6CD3@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.3.28i X-Chocolate: 70 percent or better cocoa solids preferably X-Operating-System: Linux/2.4.18 (i686) X-Uptime: 12:29:40 up 6 days, 16:05, 6 users, load average: 1.02, 1.08, 1.23 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * Pedro M. Rodrigues (pmanuel@myrealbox.com) wrote: > > How fast can one drive a pci card video memory? I guess these days you get limited by PCI speed; which for 33MHz/32 bit is 133MByte/s - on a good day with a wind behind it. I guess AGP could do a lot better. Perhaps a more interesting question is what you can use the video cards hardware for? Most video cards can blit to and from main memory - so how about things like zero clearing pages with little processor overhead. My gut feeling is that with PCI its probably still faster to do it on the processor, not sure about AGP though. Be messy though! > I once came up with the > idea to use the video memory of a pci video card as a block device and use it to > put the journal from ext3. Of course it wouldn't be solid state like the cards in the > market, at least without a battery and some circuitry changes, and i dismissed > the idea as the result of too much caffeine in my blood. Yes, thats why you need to tie it up to the film camera. Dave ---------------- Have a happy GNU millennium! ---------------------- / Dr. David Alan Gilbert | Running GNU/Linux on Alpha,68K| Happy \ \ gro.gilbert @ treblig.org | MIPS,x86,ARM, SPARC and HP-PA | In Hex / \ _________________________|_____ http://www.treblig.org |_______/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/