On Fri, 3 Aug 2018, Thomas Glanzmann wrote:
Have you tried to do something like Daniel's upload "auto-tuning" patch but
for the download buffers [*]? Or maybe that's not as easily done for
downloads...
[*] = https://github.com/curl/curl/pull/2762
No, I have not. I just tried to calculate the window size manually using the
throughput and latency and adapt. Can you get me a patch ready?
I suppose a download version of the same approach would need the download
version of SIO_IDEAL_SEND_BACKLOG_QUERY but I could't find any such... =/
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 321M 100 321M 0 0 27.0M 0 0:00:11 0:00:11 --:--:-- 28.9M
This is with 92ms latency on a gigabit link Canada <=> Germany.
But honestly I wonder why it is so fast, because I don't see where you set in
curl the SO_RCVBUF.
libcurl doesn't set SO_RCVBUF.
If I download the same file with internetexplorer, I get 2.6 MB/s.
Wow!
--
/ daniel.haxx.se
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