Sergey S. Levin wrote:
Hello Rick,
SW crypto aint cheap. It can consume lots of CPU cycles. If the
system was nearly CPU saturated with a "plain" transfer, then the
overhead of the crypto can very definitely take the throughput down
considerably.
1. If i use FileZilla and SSL connection - it works on 100% of speed.
2. The processor load is just 5% so, this should not be the crypto problem.
I'd next wonder what TCP window size(s) were being used in each case,
and if SSL was making full use of the TCP window it had available. That
means a bit of tcpdump tracing, including the connection establishment
so you can see any window scale values being exchanged.
rick jones
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