Nginx 1.6.0 + spdy performance testing

[tulio84z]

I need to evaluate if using spdy will be good for my website but i'm having
trouble setting everyting up. While using the chrome benchmark extension (1)
an error message stating that it was not possible to use spdy apeared. This
made me believe that there might be something wrong with my configuration.
However, except for two warnings, spdycheck.org tells me that spdy is
enabled. In (2) you can see what what those warnings are.

I have two questions: 

1. is there anything wrong with my configuration?
2. is there any other tool that can be used to run performance tests?
(please only suggest tools that u have tested yourself).

Ps.: chrome://net-internals/#spdy also shows that spdy 3.1 is enabled.

I have posted my configuration file in (2) but for convenience here it is
again:

server {
    listen 80;
    listen 443  ssl spdy;

    server_name 54.201.32.118;

    ssl_certificate /etc/nginx/ssl/tulio.crt;
    ssl_certificate_key /etc/nginx/ssl/tulio.key;

    if ($ssl_protocol = "") {
            rewrite ^  https://$server_name$request_uri? permanent;
    }

    root /usr/share/nginx/html;
    index index.html index.htm;

    location / {
            # First attempt to serve request as file, then
            # as directory, then fall back to displaying a 404.
            try_files $uri $uri/ =404;
            # Uncomment to enable naxsi on this location
            # include /etc/nginx/naxsi.rules
    }
}


(1)
https://sites.google.com/a/chromium.org/dev/developers/design-documents/extensions/how-the-extension-system-works/chrome-benchmarking-extension

(2)
http://serverfault.com/questions/599491/enabling-spdy-in-nginx-fails-spdycheck-org/599501#599501

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,250485,250485#msg-250485