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Old 09-08-03, 08:25 PM   #1
churritz
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Default agp fast writes

I have a geforce 3 ti200. are fast writes supported for this card? I would assume they were but my status says otherwise. My Motherboard supports them, but i figured my card would be more advanced than the motherboard...

[root@localhost xmame-0.72.1]# cat /proc/driver/nvidia/agp/card
Fast Writes: Not Supported
SBA: Not Supported
AGP Rates: 4x 2x 1x
Registers: 0x1f000007:0x0f000104
[root@localhost xmame-0.72.1]# cat /proc/driver/nvidia/agp/host-bridge
Host Bridge: Advanced Micro Devices [AMD] AMD-760 MP [IGD4-2P] System Controller
Fast Writes: Supported
SBA: Supported
AGP Rates: 4x 2x 1x
Registers: 0x0f000217:0x00000104
[root@localhost xmame-0.72.1]# cat /proc/driver/nvidia/agp/status
Status: Enabled
Driver: AGPGART
AGP Rate: 4x
Fast Writes: Disabled
SBA: Disabled
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Old 09-09-03, 08:28 PM   #2
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Default ...

I have a Geforce 3 TI 500 from Leadtek... it says in the doc that it supports AGP fast write... well my driver reports that my card do NOT support fast write... I read somewhere on the net that some board manufacters lie about the specs of their cards... because nobody will check.
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Old 09-09-03, 10:08 PM   #3
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Have you checked your kernel config? I belive you have to enable the fastwrite in there.
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Old 09-10-03, 05:20 AM   #4
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Default Kernel config?

I don't see where we can enable/disable AGP fast write support in the kernel config! Do we have to modify the kernel source before compiling it, or do we have specific options for the agpgart module?
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Old 09-10-03, 03:27 PM   #5
zander
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The NVIDIA Linux driver disables AGP fast writes to improve stability on buggy chipsets; you can enable them (at your own risk) using the NVreg_EnableAGPFW kernel module option.
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Old 09-10-03, 05:15 PM   #6
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Default I know but...

... I was takling about the fact that the driver reports through the /proc filesystem that my card does not support it. The documentation of the card says it supports fast write. I don't think it is related to the enable/disable fast write option of the nvidia kernel module... well... I hope so...
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Old 09-11-03, 03:18 AM   #7
zander
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The AGP capabilities reported in /proc are read from the card's AGP status register; if you want to make sure that this status has not been altered, check the status file after a clean reboot (before X is started).
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Old 09-12-03, 04:34 AM   #8
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Thumbs down Checked

I checked, /proc/driver/nvidia/agp/card reports that my card does not support fast writes... I think it is a tricky bug in the driver or a hidden setting or my graphic board manufacturer is a bloody lier(leadtek).
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Old 09-12-03, 06:16 AM   #9
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If you suspect a tricky bug in the driver, you can look at PCI config space (lspci -xxx) after a clean reboot without the (NVIDIA, AGPGART) driver(s) loaded, the AGP status register is found there.
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Old 09-12-03, 11:32 AM   #10
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Default Done...

I checked... nope my card does not support fast writes. I checked the registers and the right bits.

Then LeadTek lied about its board! What should I do?
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Old 09-12-03, 12:13 PM   #11
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AGP fast writes won't buy you much, if anything, in terms of performance; since they might adversely impact system reliability, however, you should probably let it go.
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Old 09-14-03, 01:36 PM   #12
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Angry OK... but...

... a lie is still a lie... and this one may deserve something... anyway LeadTek won't see my money anymore and I will spread the word.
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