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Old 09-08-10, 02:31 PM   #1
ling
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Join Date: Sep 2010
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Default How to speed up Dual QUotro NVS 420 with Xinerama

Hi,

We have a few Dell T3500 with 4GB of RAM, running RHEL 5.5. They have 2 Quatro NVS 420 installed in them, and each hooked up to 6 or 7 monitors. I have set up Xinerama so that we can have a big desktop, allowing user to move an application window from one to the other. Twinview is not used.

We are seeing extreme slowness, and high CPU usage by Xorg. On machines with only 1 Quatro connected to 4 monitors, also using Xinerama, performance is not an issue.

Is there any trick I should know about to speed up communication between the two cards? I understand there are also 2 GPU within a single Quatro. But now we are talking about GPU talking to each other over the PCIe bus. I am thinking there might be an issue there. Any hints would be appreciated.

Thanks,
...
ling
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Old 09-08-10, 03:22 PM   #2
JaXXoN
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Join Date: Jul 2005
Location: Munich
Posts: 910
Default Re: How to speed up Dual QUotro NVS 420 with Xinerama

The release notes for 260.19.04 says "Implemented support for SLI Mosaic
Mode on Quadro FX 5800 and Quadro Fermi and newer Quadro GPUs."

Sounds like SLI Mosaic Mode is not support for NVS420, but you may like
to give it a try ...

regards

Bernhard
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