Re: [Dri-users] Radeon 9200LE, PCI Version

[Alex D. <ale...@gm...>]

----- Original Message -----
From: TP Reitzel <tpr...@ho...>
Date: Tue, 22 Jun 2004 21:22:38 +0000
Subject: [Dri-users] Radeon 9200LE, PCI Version
To: dri...@li...



Yesterday's binary snapshot of the r200 driver kind of works...  with
the PCI version of the Radeon 9200 and XOrg's 6.7.0. The DRI snapshot
just exhibits extremely poor performance with most of the OpenGL
applications that I use. In fact, my PCI edition of the Radeon 7500
vastly outperforms my PCI edition of the Radeon 9200 with those
applications. For example, on the Radeon 7500, TORCS runs twice as
fast and Celestia runs 6x faster than with the Radeon 9200LE.  The
only benchmark that seems in line with the performance increase that
SHOULD be seen when upgrading to the Radeon 9200LE from the Radeon
7500 is glxgears. Glxgears runs about 30% faster than the Radeon 7500.
Does anyone have reason for this loss of performance when upgrading to
the Radeon 9200 LE? I've even tried using ATI's binary driver, 3.
 9.0, for this video card, but I get debug symbols and an error that
it fails to initialize AGP so I'm not too sure that ATI's driver
supports PCI cards...

There are several reasons for the slowness you are experiencing.  One
is that for some mysterious reason pci gart on r200 chip is slow.  no
one has been able to figure out why.  secondly, the LE and SE versions
of the 9200 and other chips are clocked lower and have half the memory
bandwidth the their non-LE/SE counterparts.  the bandwidth alone can
account for a major performance hit.


Alex

 
TIA for the work that you folks do for us while striving to make Linux
into a viable desktop.