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Old 02-09-06, 10:37 AM   #1
knox0043
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Join Date: Aug 2005
Posts: 2
Default Video memory not being mapped

My research group is trying to put together a volume rendering cluster using a number of the Nvidia Quadro 4400 which have 512MB of memory on the video card. My question is why this memory does not appear to be mapped by linux. lspci -vvv reports;
Region 0: Memory at dd00000 (32-bit, non-prefetchable) [size=16M]
Region 0: Memory at c000000 (32-bit, prefetchable) [size=256M]
Region 0: Memory at de00000 (32-bit, non-prefetchable) [size=16M]

This problem is confirmed when trying to use the memory to cache textures, after requesting more than 200MB the performance become quite terrible.

The rendering nodes consist of;
Xeon EM64
8GB Ram
RedHat EL4 2.6.9-5smp
Nvidia-7676 drivers

Thanks
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Old 02-09-06, 11:28 AM   #2
netllama
NVIDIA Corporation
 
Join Date: Dec 2004
Posts: 8,763
Default Re: Video memory not being mapped

This looks like a known bug in 1.0-7676. If this reproduces with 1.0-8178, please generate and provide a bug report along with instructions on how the problem can be reproduced.

Thanks,
Lonni
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Old 02-09-06, 03:51 PM   #3
knox0043
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Default Re: Video memory not being mapped

Thanks for your quick response. I tried upgrading to the 8178 driver and rebooting. lspci still reports only 256mb of memory, we are working on a simple test program to elicit the problem.

Mike
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