nginx SO_REUSEPORT patch

[Sepherosa Ziehau]

Hi all,

The nginx httperf result w/ SO_REUSEPORT: 49852 reqs/s
There are still 35%~40% idle time on each hyperthread (it probably could do
more, however, I can't find more boxes to run httperf on :P).

The nginx httperf result w/o SO_REUSEPORT: 37386 reqs/s

SO_REUSEPORT gives ~33% performance improvement!

One thing needs to note:
The "Send the TERM signal to the new master process. ..." binary upgrade
reverting method as mentioned in:
http://nginx.org/en/docs/control.html
will cause glitch w/ so_reuseport global option.
However, the "Send the HUP signal to the old master process. ..." binary
upgrade reverting method works smoothly w/ so_reuseport global option.

For folks compile their own nginx,
nginx-1.4.2:
http://leaf.dragonflybsd.org/~sephe/nginx142.diff
nginx-1.5.3+ and nginx development branch:
http://leaf.dragonflybsd.org/~sephe/nginx153.diff
The above patches introduce one global option: so_reuseport [on|off];
It is off by default.
I have talked to jmarino@ about import these patches to dports.

I submitted these patches to nginx one month ago (well, the accepting
progress is slow :).

Best Regards,
sephe

-- 
Tomorrow Will Never Die
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