Hi, I am in the process of writing server framework for Gemini (you can expect announcement soon) and I am looking for more ways how to test it. I did use https://github.com/michael-lazar/gemini-diagnostics and right now I am looking for ways how to test behavior on slow or weird connections. I am not too familiar with low level networking so I am looking for more information here. Specifically I would like to test scenario where client request comes in multiple packets over very slow connection. Is there some automated test which can do that for me? Or how could I test it manually (on Linux)? Thank you everyone for your work on Gemini! -- Sgiath GPG: 0x70F9C7DE34CB3BC8 () ascii ribbon campaign - against html e-mail /\ www.asciiribbon.org - against proprietary attachments
On Tue, Apr 20, 2021 at 10:18:03AM +0000, Sgaith <Sgiath at pm.me> wrote a message of 46 lines which said: > I am not too familiar with low level networking so I am looking for > more information here. Specifically I would like to test scenario > where client request comes in multiple packets over very slow > connection. Is there some automated test which can do that for me? > Or how could I test it manually (on Linux)? On Linux, you can use the "tc" program to tell the kernel to drop and/or delay packets. For instance (DON'T TYPE IT BEFORE READING IT!) tc qdisc add dev tap0 root netem delay 150ms loss 50% Will add 150 ms of delay to all packets going through the network interface tap0 and in addition will drop (more or less) half of them. % ping -c 10 gemini.circumlunar.space PING gemini.circumlunar.space(2604:180:f3::185 (2604:180:f3::185)) 56 data bytes 64 bytes from 2604:180:f3::185 (2604:180:f3::185): icmp_seq=1 ttl=54 time=78.6 ms 64 bytes from 2604:180:f3::185 (2604:180:f3::185): icmp_seq=2 ttl=54 time=78.7 ms 64 bytes from 2604:180:f3::185 (2604:180:f3::185): icmp_seq=3 ttl=54 time=78.4 ms 64 bytes from 2604:180:f3::185 (2604:180:f3::185): icmp_seq=4 ttl=54 time=78.6 ms 64 bytes from 2604:180:f3::185 (2604:180:f3::185): icmp_seq=5 ttl=54 time=78.6 ms 64 bytes from 2604:180:f3::185 (2604:180:f3::185): icmp_seq=6 ttl=54 time=78.5 ms 64 bytes from 2604:180:f3::185 (2604:180:f3::185): icmp_seq=7 ttl=54 time=79.7 ms 64 bytes from 2604:180:f3::185 (2604:180:f3::185): icmp_seq=8 ttl=54 time=78.6 ms 64 bytes from 2604:180:f3::185 (2604:180:f3::185): icmp_seq=9 ttl=54 time=78.4 ms 64 bytes from 2604:180:f3::185 (2604:180:f3::185): icmp_seq=10 ttl=54 time=82.8 ms --- gemini.circumlunar.space ping statistics --- 10 packets transmitted, 10 received, 0% packet loss, time 23ms rtt min/avg/max/mdev = 78.380/79.089/82.831/1.323 ms % sudo tc qdisc add dev eth1 root netem delay 150ms loss 50% % ping -c 10 gemini.circumlunar.space PING gemini.circumlunar.space(2604:180:f3::185 (2604:180:f3::185)) 56 data bytes 64 bytes from 2604:180:f3::185 (2604:180:f3::185): icmp_seq=1 ttl=54 time=229 ms 64 bytes from 2604:180:f3::185 (2604:180:f3::185): icmp_seq=2 ttl=54 time=230 ms 64 bytes from 2604:180:f3::185 (2604:180:f3::185): icmp_seq=3 ttl=54 time=229 ms 64 bytes from 2604:180:f3::185 (2604:180:f3::185): icmp_seq=4 ttl=54 time=233 ms 64 bytes from 2604:180:f3::185 (2604:180:f3::185): icmp_seq=7 ttl=54 time=229 ms 64 bytes from 2604:180:f3::185 (2604:180:f3::185): icmp_seq=8 ttl=54 time=230 ms 64 bytes from 2604:180:f3::185 (2604:180:f3::185): icmp_seq=9 ttl=54 time=229 ms 64 bytes from 2604:180:f3::185 (2604:180:f3::185): icmp_seq=10 ttl=54 time=229 ms --- gemini.circumlunar.space ping statistics --- 10 packets transmitted, 8 received, 20% packet loss, time 71ms rtt min/avg/max/mdev = 228.666/229.638/232.723/1.252 ms
Thanks, that definitely helped! I also figured out that I could edit the `gemini-diagnostics` to send really large request to force it to be split into multiple packets to test this kind behavior. Have a nice day -- Sgiath GPG: 0x70F9C7DE34CB3BC8 () ascii ribbon campaign - against html e-mail /\ www.asciiribbon.org - against proprietary attachments
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