[AG-TECH] PCI performance partial fix found

Robert Olson olson at mcs.anl.gov
Tue Aug 21 12:13:35 CDT 2001

I was poking around in SuperMicro P6DBE bios settings, and found this:

USWC Write Post
The settings for this option are Enabled or Disabled. This option sets the
status of USWC (Uncacheable, Speculative, Write-Combining) posted writes
and is used to combine several partial writes to the frame buffer into a single
write in order to reduce the data bus traffic. Set to Enabled to enable USWC
posted writes to I/O. Set to Disabled to disable USWC posted writes to I/O.

When I disabled this setting in the BIOS, I got MUCH better performance 
with video spread across both the PCI and AGP display heads (in a G450 
AGP/PCI/PCI system, with dual heads in use on the G450 AGP).


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