Handling 500k concurrent connections on Linux

[John Watson]

I was wondering if anyone had some tips/guidelines for scaling Nginx on
Linux to >500k concurrent connections. Playing with the
nginx_http_push_stream module in streaming mode. Noticing periodic slow
accept and/or response headers. I've scoured the Internet
looking/learning ways to tune Nginx/Linux but I think I've exhausted my
abilities.

Any help would be appreciated.

Hardware
Dual Nehalem 5520
24G RAM
Intel 82576 (igb)
Ubuntu 12.04.1 (3.2.0-31-generic x86_64)

Thank You,

John W
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