I'm seeing a 4x speedup in bandwidth and a 33% reduction in latency:

NetBSD 1.5 (GENERIC) #1: Sun Nov 19 21:42:11 MET 2000
    fvdl@sushi:/work/trees/netbsd-1-5/sys/arch/i386/compile/GENERIC
cpu0: Intel Pentium Pro (686-class)
total memory = 127 MB

Pipe bandwidth: 48.36 MB/sec
Pipe bandwidth: 48.44 MB/sec
Pipe bandwidth: 47.87 MB/sec
Pipe bandwidth: 47.25 MB/sec
Pipe latency: 66.7083 microseconds
Pipe latency: 66.0715 microseconds
Pipe latency: 65.2185 microseconds
Pipe latency: 65.5195 microseconds



NetBSD 1.5U (MORTEfw) #0: Thu Apr 26 11:36:49 EDT 2001
    bmccoy@morte:/usr/src/sys/arch/i386/compile/MORTEfw
cpu0: Intel Pentium Pro (686-class), 199.44 MHz
cpu0: I-cache 8K 32b/line 4-way, D-cache 8K 32b/line 2-way
cpu0: L2 cache 256K 32b/line 4-way
cpu0: features f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR>
cpu0: features f9ff<PGE,MCA,CMOV>
total memory = 127 MB

Pipe bandwidth: 194.09 MB/sec
Pipe bandwidth: 194.19 MB/sec
Pipe bandwidth: 195.95 MB/sec
Pipe bandwidth: 195.06 MB/sec
Pipe latency: 43.7297 microseconds
Pipe latency: 43.2581 microseconds
Pipe latency: 43.7508 microseconds
Pipe latency: 43.2424 microseconds


This kernel also has the UVM patch posted by Lars Heidieker
<lars@heidieker.de> on Apr 7.

++Brett;