** Changed in: dcplusplus
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/1909853
Title:
Don't use custom socket buffer sizes by default
Status in DC++:
Fix Committed
Bug description:
Modern operating systems (Linux 2.4+, Windows Vista+) should support
TCP tuning (https://en.wikipedia.org/wiki/TCP_tuning) to enable higher
per-thread speeds with fast connections. However, the current default
socket buffer size (65536 bytes) set by the client will prevent the
feature from being utilized.
Example: with a 80 ms RTT the maximum transfer speed is about 6.5 Mbps
with the current default buffer values
(https://www.switch.ch/network/tools/tcp_throughput/)
I've done some testing and auto tuning seems to be working as
expected. When downloading from another user (Windows -> Linux) with a
20 ms RTT and buffer sizes set to 0 in both clients, I was able to
utilize my 100 Mbps connection with a single thread, while using the
old buffer size limited the speed to ~30 Mbps, which matches the
maximum speed given by the calculator.
The required code changes are quite trivial:
https://github.com/airdcpp/airdcpp-
windows/commit/f96ef123c8152860bb796208cadbe051cc5a8da8
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