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> >Have you tried 1.4Q with the A/UX interrupts disabled?
> Looks even worse.

I am attaching a patch to the 1.5.x version of sys/arch/mac68k/obio/esp.c.
I'm attempting to compile with this change now, but you're welcome to
try it.  This should make some difference, but I'm not sure how much...
Let me know if it does help.

-allen

-- 
 Allen Briggs                     briggs@wasabisystems.com
 http://www.wasabisystems.com/    Quality NetBSD CDs, Sales, Support, Service

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Index: esp.c
===================================================================
RCS file: /cvsroot/syssrc/sys/arch/mac68k/obio/esp.c,v
retrieving revision 1.25
diff -u -r1.25 esp.c
--- esp.c	2000/06/05 07:59:52	1.25
+++ esp.c	2000/12/16 22:28:18
@@ -581,10 +581,7 @@
 esp_dafb_have_dreq(esc)
 	struct esp_softc *esc;
 {
-	u_int32_t r;
-
-	r = bus_space_read_4(esc->sc_tag, esc->sc_bsh, 0);
-	return (r & 0x200);
+	return (*(volatile u_int32_t *) (esc->sc_bsh->base) & 0x200);
 }
 
 static __inline__ int

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