fix: new lwt server bugs

[rgrinberg]

• cannot call direct access recursively
• we need to catch conn_reset

Signed-off-by: Rudi Grinberg [email protected]

[rgrinberg]

[nix-shell:~/github/mirage/ocaml-cohttp]$ wrk -c 10000 http://0.0.0.0:8080
Running 10s test @ http://0.0.0.0:8080
  2 threads and 10000 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     2.90ms  393.44us  14.28ms   78.55%
    Req/Sec    43.35k     3.18k   49.64k    68.50%
  862623 requests in 10.02s, 1.68GB read
  Socket errors: connect 9749, read 92, write 0, timeout 0
Requests/sec:  86073.66
Transfer/sec:    171.89MB

[nix-shell:~/github/mirage/ocaml-cohttp]$ wrk -c 10000 http://0.0.0.0:8080
Running 10s test @ http://0.0.0.0:8080
  2 threads and 10000 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     2.62ms    1.10ms  45.98ms   84.59%
    Req/Sec    46.79k     4.34k   53.53k    79.50%
  931481 requests in 10.03s, 1.84GB read
  Socket errors: connect 9749, read 96, write 0, timeout 0
Requests/sec:  92853.50
Transfer/sec:    187.55MB

The first result is for the new lwt sever, and the second is for the old. Note the max latency is much lower (although still kind of high)