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Date:      Fri, 1 Mar 1996 20:10:20 +1100
From:      Bruce Evans <bde@zeta.org.au>
To:        davidg@Root.COM, jgreco@brasil.moneng.mei.com
Cc:        angio@aros.net, hackers@freebsd.org, jc@irbs.com
Subject:   Re: 100-baseT hub recommendation?
Message-ID:  <199603010910.UAA04513@godzilla.zeta.org.au>

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[SMC Etherpower 10/100's vs Intel 100baseT]

>   There aren't any known bugs in the driver. Performance is about 5% higher
>with the Intel card compared to the SMC/DEC.

There seems to be a latency problem in the de driver or hardware.  The ed
driver gives about 3% higher performance than the de driver with my 10Mbps
cards:

machine a: P133 - ASUS P55TP4XE - Accton EN1203 (DEC 21040)
machine b: 486DX2/66 - No-name slow ISA - No-name AE-200JL (NE2000/WD8013EBT clone)
machine c: 486DX/33 - No-name slow ISA - No-name AE-200JL (NE2000/WD8013EBT clone)

a -> c as seen be c
ttcp-r: socket
ttcp-r: accept from 192.168.2.1
ttcp-r: buflen=8192, nbuf=2048, align=16384/+0, port=5001  tcp
ttcp-r: 167772160 bytes in 154.38 real seconds = 1061.26 KB/sec +++
ttcp-r: 116133 I/O calls, msec/call = 1.36, calls/sec = 752.24
ttcp-r: 1.3user 32.9sys 2:34real 22% 16i+228d 228maxrss 0+2pf 115572+505csw

b -> c as seen by c
ttcp-r: socket
ttcp-r: accept from 192.68.2.2
ttcp-r: buflen=8192, nbuf=2048, align=16384/+0, port=5001  tcp
ttcp-r: 167772160 bytes in 149.82 real seconds = 1093.55 KB/sec +++
ttcp-r: 116367 I/O calls, msec/call = 1.32, calls/sec = 776.69
ttcp-r: 1.3user 33.3sys 2:29real 23% 16i+226d 220maxrss 0+2pf 116075+502csw

As usual, PIO gives better performance than DMA :-).  The busmastering
controller has less overhead of course:

machine a:  8% Sys +  4% Intr = 12%
machine b: 25% Sys + 55% Intr = 80%

Bruce



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