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Old 12-14-03, 04:07 PM   #1
joeljkp
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Default AGP Fast Writes & SBA?

I'm using the 4496 NVIDIA drivers on Gentoo with kernel 2.4.23.

/proc/driver/nvidia/agp/status says:

Status: Enabled
Driver: AGPGART
AGP Rate: 4x
Fast Writes: Disabled
SBA: Disabled

/proc/driver/nvidia/agp/card says:

Fast Writes: Supported
SBA: Supported
AGP Rates: 4x 2x 1x
Registers: 0x1f000217:0x1f000104


What are Fast Writes and SBA, and how do I enable them?
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Old 12-14-03, 04:28 PM   #2
LordMorgul
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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.
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Old 12-14-03, 09:10 PM   #3
Wolfman [TWP]
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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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Old 12-15-03, 01:50 AM   #4
mariuz
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it works well on a nforce2 based system .
I Wonder why
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