[Qt-interest] QSslSocket: poor throughput over long fat pipes ?

[Stephen Collyer]

I have a client who has reported poor throughput with a
QTcpServer/QSslSocket
based app when run over a long fat pipe with a bandwidth-delay product of
about 1.2MB (b/w of 622Mb/s and latency of 15ms).

When using a curl client and Apache server on this link, throughput was
about 60MB/s.

When using a curl client and the QTcpServer/QSslSocket (in unencrypted
mode) throughput was about 20MB/s.

Both tests were run on the same Opensuse 10.3 installation.

Does anyone know if there are inherent limitations in the Qt socket
implementation (in the event loop maybe) that could limit QSslSocket
performance to such an extent ?

-- 
Stephen Collyer
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