From: Michel Dänzer <daenzerm@student.ethz.ch>
To: mlan@cpu.lu
Cc: geert@linux-m68k.org, linuxppc-dev@lists.linuxppc.org,
dmj+@andrew.cmu.edu
Subject: Re: Control fb problem on 8500
Date: Wed, 23 Aug 2000 00:39:52 +0200 [thread overview]
Message-ID: <39A30138.36D33D93@student.ethz.ch> (raw)
In-Reply-To: 200008222110.XAA00741@piglet.grunz.lu
Michel Lanners wrote:
> > I don't think having to use ShadowFB with the fbdev driver is too bad
> > because it should generally enhance performance :)
>
> I guess control is the exception. I found out it isn't worth the memory
> impact. I once ran a complete x11perf run comparing with and without
> shadowfb, and with shadowfb was overall slower. Some operations were
> faster, though, but not in general.
Oh no. This is very bad.
> I suppose this is because main memory isn't faster on my box than access
> to the VRAM. Both are accessed via a 50 MHz bus, and are of the same
> basic type (plain old DRAM, that is).
Indeed, this breaks the basic assumption behind ShadowFB, that main RAM is
very fast compared to video RAM. The situation is similar for Amigas :-/
Michel
--
Earthling Michel Dänzer (MrCooper) \ CS student and free software enthusiast
Debian GNU/Linux (powerpc,i386) user \ member of XFree86 and The DRI Project
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2000-08-22 22:39 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-08-15 17:45 Control fb problem on 8500 Kevin M. Myer
2000-08-15 18:26 ` Michel D nzer
2000-08-15 19:41 ` Michel Lanners
2000-08-18 21:02 ` Michel Lanners
2000-08-19 6:47 ` Daniel Jacobowitz
2000-08-19 7:18 ` Michel Lanners
2000-08-19 11:59 ` Benjamin Herrenschmidt
2000-08-19 14:15 ` XF4 hangs on 2.4 kernel (was: Re: Control fb problem on 8500) Michel Lanners
2000-08-19 15:16 ` Martin Costabel
2000-08-23 12:18 ` Kostas Gewrgiou
2000-08-19 12:12 ` Control fb problem on 8500 Geert Uytterhoeven
2000-08-21 11:25 ` Michael Schmitz
2000-08-21 13:19 ` Michel Dänzer
2000-08-21 16:44 ` Geert Uytterhoeven
2000-08-21 17:11 ` Michael Schmitz
2000-08-19 13:20 ` Michel Dänzer
2000-08-21 8:57 ` Michel Dänzer
2000-08-21 10:46 ` Geert Uytterhoeven
2000-08-21 13:14 ` Michel Dänzer
2000-08-21 16:45 ` Geert Uytterhoeven
2000-08-22 8:33 ` Michel Dänzer
2000-08-22 9:42 ` Geert Uytterhoeven
2000-08-22 10:14 ` Michel Dänzer
2000-08-22 21:15 ` Michel Lanners
2000-08-22 21:55 ` Michel Dänzer
2000-08-23 11:51 ` Geert Uytterhoeven
2000-08-22 21:10 ` Michel Lanners
2000-08-22 22:39 ` Michel Dänzer [this message]
2000-08-23 8:11 ` Michael Schmitz
2000-08-23 8:21 ` Michel Dänzer
2000-08-21 11:33 ` Michael Schmitz
2000-08-19 14:40 ` David Riley
[not found] <200008160459.XAA20764@lists.linuxppc.org>
2000-08-22 10:51 ` William H. Schultz
2000-08-22 11:56 ` Benjamin Herrenschmidt
2000-08-22 16:52 ` Geert Uytterhoeven
2000-08-23 14:03 ` William H. Schultz
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=39A30138.36D33D93@student.ethz.ch \
--to=daenzerm@student.ethz.ch \
--cc=dmj+@andrew.cmu.edu \
--cc=geert@linux-m68k.org \
--cc=linuxppc-dev@lists.linuxppc.org \
--cc=mlan@cpu.lu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).