I am see performance problems running with pcnet32 vs eepro on powerpc
Configuration:
RS-6000 pSeries 640
pcnet32 ethernet adapter
eepro ethernet adapter
Linux 2.4.4
connected via crossover cable at 100Mb to
RS6000 B50
pcnet32 ethernet adapter
Linux 2.4.4
When connected pcnet32 -> pcnet32 netperf gives reports the following:
TCP STREAM TEST: b50t
(+/-5.0% with 99% confidence) - Version: 5.0.0.7 (Linux PPC [IPv6)]
Jun 11 1911 03:52:26
Recv Send Send ---------------------
Socket Socket Message Elapsed Throughput
Size Size Size Time (iter) ---------------------
bytes bytes bytes secs. 10^6bits/s KBytes/s
87380 16384 100 4.21(03) 26.48 3232.15
When connected eepro100 -> pcnet32 netperf gives reports the following:
TCP STREAM TEST: b50t
(+/-5.0% with 99% confidence) - Version: 5.0.0.7 (Linux PPC [IPv6)]
Jun 11 1911 03:52:26
Recv Send Send ---------------------
Socket Socket Message Elapsed Throughput
Size Size Size Time (iter) ---------------------
bytes bytes bytes secs. 10^6bits/s KBytes/s
87380 16384 100 4.21(03) 93.62 11428.31
Also the same performance degradation can be seen via ftp where ftping from
the
eepro to the pcnet32 is 3.7 X faster then pcnet32 to pcnet32.
One other note of interest, the same pcnet32 adapter on an AIX box does not
show
this performance problem.
Has anyone see this or know of any tuning that can be done? Also any tips
on how
to debug this problem?
Thanks,
Michael Wortman
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