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Improve performance on long fat networks (LFNs)

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On Linux, the TCP send buffer size is increased to 32768 if it is less
that this (which it normally is). This however has the effect of disabling
dynamic buffer sizing, leading to a maximum available bandwidth of

max_bandwidth = 262144 (bits) / round_trip_time (secs)

This is not noticeable on a LAN with an RTT of around 0.5ms, but
very noticeable on a WAN with an RTT of 0.25s.

Comments in the config file and manpage in this area are improved, as
is the logging if the parameters are actually set.
This commit is contained in:
matt335672
2024-01-11 11:53:54 +00:00
parent a547a8b613
commit b23d6f89d5
4 changed files with 29 additions and 43 deletions
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docs/man/xrdp.ini.5.in
+3 -1
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@@ -177,7 +177,9 @@ If set to \fB1\fP, \fBtrue\fP or \fByes\fP, no buffering will be performed in th
\fBtcp_send_buffer_bytes\fP=\fIbuffer_size\fP
.TP
\fBtcp_recv_buffer_bytes\fP=\fIbuffer_size\fP
Specify send/recv buffer sizes in bytes. The default value depends on operating system.
Specify send/recv buffer sizes in bytes. The default value depends on
the operating system. It is recommended not to set these on systems with
dynamic TCP buffer sizing
.TP
\fBtls_ciphers\fP=\fIcipher_suite\fP