1741094 - H3/IPv4 from CloudFlare is slower than H3/IPv6 and H2

Status: RESOLVED MOVED

(Core :: Networking: HTTP, defect)

Description

[Jan Alexander Steffens [:heftig]]

I occasionally suffer from slow transfers (~200-300 KB/s) from CloudFlare, which seem to disappear once I disable http3.

Firefox Nightly,
Linux, WiFi,
ISP: Deutsche Telekom

I've been able to reproduce this with the bare neqo-client, using the patches from https://github.com/mozilla/neqo/pull/1262.

Slow (H3/IPv4, 23.15 seconds):

> /usr/bin/time target/debug/neqo-client --output-dir foo https://derpicdn.net/img/view/2018/11/20/1886618.jpg -4
<snip>
3.45user 0.34system 0:23.15elapsed 16%CPU (0avgtext+0avgdata 13348maxresident)k
0inputs+12752outputs (0major+728minor)pagefaults 0swaps

Fast (H3/IPv6, 2.4 seconds):

> /usr/bin/time target/debug/neqo-client --output-dir foo https://derpicdn.net/img/view/2018/11/20/1886618.jpg -6
<snip>
1.26user 0.11system 0:02.40elapsed 57%CPU (0avgtext+0avgdata 13412maxresident)k
0inputs+12792outputs (0major+777minor)pagefaults 0swaps

Faster (Curl H2, 0.7 seconds):

> /usr/bin/time curl -s -4 --http2 https://derpicdn.net/img/view/2018/11/20/1886618.jpg >/dev/null
0.02user 0.01system 0:00.75elapsed 5%CPU (0avgtext+0avgdata 10084maxresident)k
0inputs+0outputs (0major+734minor)pagefaults 0swaps

> /usr/bin/time curl -s -6 --http2 https://derpicdn.net/img/view/2018/11/20/1886618.jpg >/dev/null
0.02user 0.01system 0:00.68elapsed 4%CPU (0avgtext+0avgdata 10180maxresident)k
0inputs+0outputs (0major+733minor)pagefaults 0swaps

Comment 1

[(inactive) Nihanth Subramanya [:nhnt11]]

This definitely needs to be filed in the neqo github repo, I think. Filed https://github.com/mozilla/neqo/issues/1266.

Dragana, should we just close this here?

Comment 2

[Dragana Damjanovic [:dragana]]

We will follow this issue on the gihub repo for neqo.