From: Jon Smirl <jonsmirl@gmail.com>
To: linux-fbdev-devel@lists.sourceforge.net,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Jon Smirl <jonsmirl@yahoo.com>,
dri-devel@lists.sourceforge.net, xorg@lists.freedesktop.org
Subject: Re: [Linux-fbdev-devel] Re: radeon, apertures & memory mapping
Date: Sun, 13 Mar 2005 12:56:26 -0500 [thread overview]
Message-ID: <9e4733910503130956401e1107@mail.gmail.com> (raw)
In-Reply-To: <20050313174714.GA15871@sci.fi>
On Sun, 13 Mar 2005 19:47:14 +0200, Ville Syrjälä <syrjala@sci.fi> wrote:
> I don't understand why we have "GART memory" anyway. It's just main memory
> and I don't see any point going through the GART to access it with the
> CPU. Only the graphics card needs to use the GART.
I see no need to for the CPU to go through the GART either. The main
CPU page tables can provide the same rearranging that the GART does.
We do need specially marked GART memory because of caching issues. If
the CPU writes to GART RAM the write may still be on the CPU chip in a
cache. We have to make sure it gets pushed into physical memory so
that the GPU can see it.
The best model would be to chuck the AGP/PCI Express interface on the
board and have a hyperchannel instead. Hyperchannel provides full
cache consistency without all of these flushing problems. The GPU
really is another specialized CPU, give it a CPU class memory
interface.
--
Jon Smirl
jonsmirl@gmail.com
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next prev parent reply other threads:[~2005-03-13 17:56 UTC|newest]
Thread overview: 106+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-13 1:35 radeon, apertures & memory mapping Benjamin Herrenschmidt
2005-03-13 3:22 ` Jon Smirl
2005-03-13 6:43 ` Benjamin Herrenschmidt
2005-03-13 16:22 ` Jon Smirl
2005-03-14 4:28 ` [Linux-fbdev-devel] " Michel Dänzer
2005-03-14 7:12 ` Benjamin Herrenschmidt
2005-03-14 16:20 ` Michel Dänzer
2005-03-14 21:52 ` Benjamin Herrenschmidt
2005-03-14 22:12 ` Michel Dänzer
2005-03-14 22:37 ` FB model basic issues (WAS: radeon, apertures & memory mapping) Benjamin Herrenschmidt
2005-03-15 4:59 ` Michel Dänzer
2005-03-15 5:14 ` Jon Smirl
2005-03-15 6:01 ` Ville Syrjälä
2005-03-15 6:59 ` Benjamin Herrenschmidt
2005-03-15 14:00 ` Ville Syrjälä
2005-03-15 14:29 ` Jon Smirl
2005-03-15 17:25 ` Jan Gukelberger
2005-03-15 23:34 ` Benjamin Herrenschmidt
2005-03-15 8:51 ` Geert Uytterhoeven
2005-03-15 13:36 ` [Linux-fbdev-devel] " Ville Syrjälä
2005-03-15 23:33 ` Benjamin Herrenschmidt
2005-03-15 23:37 ` Antonino A. Daplas
2005-03-15 23:50 ` [Linux-fbdev-devel] " Benjamin Herrenschmidt
2005-03-16 1:47 ` Ville Syrjälä
2005-03-16 1:51 ` Benjamin Herrenschmidt
2005-03-16 19:51 ` Ville Syrjälä
2005-03-16 21:00 ` Michel Dänzer
2005-03-16 21:07 ` Ville Syrjälä
2005-03-16 23:28 ` Benjamin Herrenschmidt
2005-03-16 23:53 ` Michel Dänzer
2005-03-16 23:25 ` [Linux-fbdev-devel] " Benjamin Herrenschmidt
[not found] ` <1110929582.25201.34.camel@gaston>
2005-03-16 5:21 ` Michel Dänzer
2005-03-16 6:31 ` Benjamin Herrenschmidt
2005-03-16 14:09 ` Ville Syrjälä
2005-03-16 16:48 ` Adam Jackson
2005-03-16 23:20 ` Benjamin Herrenschmidt
2005-03-15 11:30 ` Roland Scheidegger
2005-03-15 13:27 ` Ville Syrjälä
2005-03-15 17:17 ` Michel Dänzer
2005-03-16 3:09 ` Benjamin Herrenschmidt
2005-03-16 20:08 ` Ville Syrjälä
2005-03-16 20:42 ` [Linux-fbdev-devel] " Michel Dänzer
2005-03-16 23:26 ` Benjamin Herrenschmidt
2005-03-16 23:35 ` Jon Smirl
2005-03-17 0:06 ` [Linux-fbdev-devel] " Benjamin Herrenschmidt
2005-03-16 20:58 ` Alex Deucher
2005-03-16 21:08 ` Ville Syrjälä
2005-03-16 21:17 ` Alex Deucher
2005-03-16 23:30 ` Benjamin Herrenschmidt
2005-03-17 0:47 ` Ville Syrjälä
2005-03-17 1:12 ` Benjamin Herrenschmidt
2005-03-17 1:25 ` Ville Syrjälä
2005-03-17 2:00 ` Benjamin Herrenschmidt
2005-03-17 9:08 ` Geert Uytterhoeven
2005-03-17 19:54 ` [Linux-fbdev-devel] " Ville Syrjälä
2005-03-15 22:44 ` Benjamin Herrenschmidt
2005-03-15 23:05 ` Ville Syrjälä
2005-03-15 23:49 ` Benjamin Herrenschmidt
2005-03-16 20:55 ` Ville Syrjälä
2005-03-16 23:27 ` Benjamin Herrenschmidt
2005-03-17 0:14 ` Ville Syrjälä
2005-03-17 0:28 ` Benjamin Herrenschmidt
2005-03-15 6:45 ` Benjamin Herrenschmidt
2005-03-15 5:30 ` Jon Smirl
2005-03-15 6:58 ` Benjamin Herrenschmidt
2005-03-15 21:58 ` Ian Romanick
2005-03-13 3:55 ` radeon, apertures & memory mapping Vladimir Dergachev
2005-03-13 6:44 ` Benjamin Herrenschmidt
2005-03-13 8:22 ` Ville Syrjälä
2005-03-13 9:20 ` Benjamin Herrenschmidt
2005-03-13 10:39 ` Ville Syrjälä
2005-03-13 12:04 ` Benjamin Herrenschmidt
2005-03-13 16:19 ` Jon Smirl
2005-03-13 17:47 ` Ville Syrjälä
2005-03-13 17:56 ` Jon Smirl [this message]
2005-03-13 21:52 ` [Linux-fbdev-devel] " Benjamin Herrenschmidt
2005-03-13 22:17 ` Jon Smirl
2005-03-13 22:41 ` Benjamin Herrenschmidt
2005-03-13 21:51 ` Benjamin Herrenschmidt
2005-03-13 21:49 ` Benjamin Herrenschmidt
2005-03-13 22:10 ` Jon Smirl
2005-03-13 22:20 ` Benjamin Herrenschmidt
2005-03-13 23:00 ` Jon Smirl
2005-03-13 23:11 ` Benjamin Herrenschmidt
2005-03-13 23:27 ` Ville Syrjälä
2005-03-13 23:48 ` Benjamin Herrenschmidt
2005-03-14 0:08 ` Ville Syrjälä
2005-03-14 0:10 ` Benjamin Herrenschmidt
2005-03-14 0:25 ` Jon Smirl
2005-03-14 0:39 ` Ville Syrjälä
2005-03-14 1:02 ` Benjamin Herrenschmidt
2005-03-14 0:54 ` Benjamin Herrenschmidt
2005-03-14 0:41 ` Paul Mackerras
2005-03-14 0:56 ` Ville Syrjälä
2005-03-14 1:05 ` [Linux-fbdev-devel] " Benjamin Herrenschmidt
2005-03-14 1:47 ` Jon Smirl
2005-03-14 3:59 ` Benjamin Herrenschmidt
2005-03-14 4:07 ` Paul Mackerras
2005-03-14 4:40 ` Jon Smirl
2005-03-14 5:09 ` [Linux-fbdev-devel] " Benjamin Herrenschmidt
2005-03-14 16:30 ` Soeren Sandmann
2005-03-14 16:40 ` Ville Syrjälä
2005-03-14 21:54 ` Benjamin Herrenschmidt
2005-03-14 16:16 ` Ville Syrjälä
2005-03-14 21:27 ` Donnie Berkholz
2005-03-14 21:51 ` Benjamin Herrenschmidt
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