|12-14-03, 04:07 PM||#1|
Join Date: Dec 2002
AGP Fast Writes & SBA?
I'm using the 4496 NVIDIA drivers on Gentoo with kernel 2.4.23.
AGP Rate: 4x
Fast Writes: Disabled
Fast Writes: Supported
AGP Rates: 4x 2x 1x
What are Fast Writes and SBA, and how do I enable them?
|12-14-03, 04:28 PM||#2|
Join Date: Dec 2002
Location: San Luis Obispo, CA
Fast Writes and Side Band Addressing are two more advanced features of the architecture that both improve the absolute peak performance, I do not fully understand the design of course but they are for improving maximum bandwidth. For most applications / hardware combos, using them only creates instability however, with little gain. The main reason for little gain is that machine bottlenecks are typically not in the video card, but in the mobo or processor and these don't do that much to reduce it. I gained about 2 fps in most games by using it, so if that matters to you, experiment by all means.
You enable them by changing some code in the kernel module interface code supplied in the installer, extract it and then edit the code to enable them.
Edit the file os-registry.c as appropriate for you.
|12-14-03, 09:10 PM||#3|
Geforce 8800 GTS 512
Join Date: Nov 2002
You can also enable them by adding the following line to your /etc/modules.conf file.
options nvidia NVreg_EnableAGPFW=1 NVreg_EnableAGPSBA=1
And as LordMorgul said, that it may not improve the performance by much, but that will also depend on the mobo, and video card.
Oh, and also the mobo's BIOS will need to have fastwrites enabled as well.
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