ITEM: V0824L

ftp versus rcp file transfer performance on AIX 3.2.5

A comparison of ftp and rcp performance over fddi, 16Mbit
Token-Ring, and 10Mbit Ethernet.  How fast can we copy a 13078537
Byte file from a model 560 running AIX 3.2.5 to a 530 running
AIX 3.2.5?  Some changes were made to mbuf tuning which would
affect all interfaces:

no -o sb_max=262144        (up from default 65536)
no -o tcp_sendspace=65536  (up from default 16384)
no -o tcp_recvspace=65536  (up from default 16384)

The above changes, and the following change affect thruput on FDDI:

no -o rfc1323=1            (enable rfc1323 support)

When copying the 13MByte file, the following elapsed times were
observed:

Token-Ring ftp:
13078537 bytes sent in 45.67 seconds (279.7 Kbytes/s)
real    0m46.73s
user    0m2.38s
sys     0m1.61s

802.3 ftp:
13078537 bytes sent in 44.39 seconds (287.7 Kbytes/s)
real    0m45.60s
user    0m2.19s
sys     0m1.71s

Ethernet V2 ftp:
13078537 bytes sent in 44.54 seconds (286.7 Kbytes/s)
real    0m45.45s
user    0m2.18s
sys     0m1.68s

FDDI ftp:
13078537 bytes sent in 38.53 seconds (331.5 Kbytes/s)
real    0m39.59s
user    0m2.25s
sys     0m1.54s

Token-Ring rcp:
real    0m15.67s
user    0m0.10s
sys     0m1.47s

802.3 rcp:
real    0m14.86s
user    0m0.12s
sys     0m1.80s

Ethernet V2 rcp:
real    0m14.01s
user    0m0.14s
sys     0m1.47s

FDDI rcp:
real    0m9.38s
user    0m0.05s
sys     0m1.35s

Conclusions:

rcp appears to provide approximately 3 times the data rate of
ftp on ethernet and token-ring, and approximately 4 times the
data rate of ftp on fddi.

There is not a clear performance difference between Token-Ring
and ethernet.  It should be noted that the ethernet segment tested
is very lightly used (3 nodes) while the Token-Ring segment is a
building ring with perhaps as many as 200 nodes in production
use.



Support Line: ftp versus rcp file transfer performance on AIX 3.2.5 ITEM: V0824L

Dated: May 1995 Category: N/A

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