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Of course compression/encryption takes CPU time. It turned out that an
old Pentium-133 is able to encrypt and compress about 1GB/hour -- that's quite
a lot. If you compile SSH with the option "--with-none" you can
tell SSH to use no encryption. That saves a little performance. Here is a comprise
between several download methods (during the test, a noncompressed 6MB-file
was transfered from a 133MHz-Pentium-1 to a 233MHz Pentium2 laptop over a 10MBit
ethernet without other load).
+-------------------+--------+----------+-----------+----------------------+
| | FTP |encrypted |compressed |compressed & encrypted|
+-------------------+--------+----------+-----------+----------------------+
+-------------------+--------+----------+-----------+----------------------+
| Elapsed Time | |7.6s | 26s | 9s | 23s |
+-------------------+--------+----------+-----------+----------------------+
| Throughput | 790K/s | 232K/s | 320K/s | 264K/s |
+-------------------+--------+----------+-----------+----------------------+
|Compression Factor | 1 | 1 | 3.8 | 3.8 |
+-------------------+--------+----------+-----------+----------------------+
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