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-
- This is a quick sanity check of DMA and Verite in your system.
- Run this in DOS or a DOS box. The two .voh files must be in
- the same directory as dmatest.exe.
-
- The test checks if the Verite busmastering capability is enabled at the
- time the test is run (i.e., you may need to try it in DOS, in a
- Windows-shutdown-to-DOS, or in a DOS box; each of these has been
- known to give different results.) Some system BIOSes have been
- known to disable busmastering even though the Verite chip supports it.
-
- The test then checks if bus snooping is working. Some older
- motherboards do not implement this correctly, and DMA will fail
- to work properly. If you have such a system, you must explicitly
- disable DMA for the Verite chip. See your board vendor for
- instructions that may be specific to the Windows drivers you use.
-
- Finally, the test measures approximate FIFO and DMA performance
- (the numbers should be considered only +/- 10% accurate.) A
- "Test completed successfully." message means that DMA should run just
- fine on your system in that particular configuration.
-
- You may be able to improve your DMA performance by adjusting the value
- of the PCI latency timer. Increasing it can improve the numbers
- reported. Changing that timer, however, may have unforseen effects
- on your system.
-
-