Thanks to ross and jason for suggesting adding the options  
TULIP_BUS_DMA_NORX.  This does solve the problem that I was exhibiting under  
heavy network loading, and hopefully will point someone in the direction  
necessary to fix it to work again with the bus space stuff.

Less frustrated,
--billc

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William J. Coldwell                             MediaPlex Communications
Gizmo Attitude Adjuster                         Internet Extra Corporation
http://www.warped.com/~billc                    WebMaster, Inc.
v:408.346.0106 p:415.423.8147                   Warped Communications