It will not help you actualy but I had a similar experience.

My issue was due to the system event handle (epoll, kqueue...)

I noticed poor speed when hitting 2000 connections with haproxy. So I
switch to nginx + tcp module proxy. Same results..

But using haproxy + nginx (with two different event handler, I avoid
the speed problem). At the end, I prefered use ESXi and 2/3 VM and
split connections with DNS load balancing

Maybe you should take a look at this event handler problem and do some
tunning on kernel/OS. Nginx (maybe) isn't the actual issue.

2013/1/23 shahzaib shahzaib <shahzaib.cb@gmail.com>:
> The average size of each flv video is 60Mb+. We've five content servers
> (nginx-1.2.1), each with 1Gbps port and 100TB bandwidth per month. Right now
> each server is consuming 10~12 bandwidth per day and we're going to run out
> of bandwidth on coming last days of month. However we limited every
> connection to 180k, you can see limit_rate 180k; in nginx.conf file.
>
> I am newbie to this field. Please correct me if i didn't satisfy your
> question regarding bandwidth. :)
>
>
> On Wed, Jan 23, 2013 at 5:39 PM, Dennis Jacobfeuerborn
> <dennisml@conversis.de> wrote:
>>
>> On 01/23/2013 10:43 AM, shahzaib shahzaib wrote:
>> > Hello,
>> >
>> > We are using nginx to serve large size of static files i.e
>> > jpg,flv
>> > and mp4 . Nginx stream works very well on 1000~1500 concurrent
>> > connections
>> > but whenever connections exceeded to 2000~2200, stream gets too slow.
>> > We've
>> > five content server with following specification:-
>> >
>> > Dual Quard Core (8cores/16threads)
>> > RAM = 32G
>> > HDD = Sas Hard-Raid 10
>> >
>> >
>> > My nginx.conf config is given below :
>> >
>> > user nginx;
>> > worker_processes 16;
>> > worker_rlimit_nofile 300000; #2 filehandlers for each connection;
>> >
>> > #pid logs/nginx.pid;
>> >
>> >
>> > events {
>> > worker_connections 6000;
>> > use epoll;
>> > }
>> > http {
>> > include mime.types;
>> > default_type application/octet-stream;
>> > limit_rate 180k;
>> > client_body_buffer_size 128K;
>> > sendfile_max_chunk 128k;
>> > server_tokens off; #Conceals nginx version
>> > access_log off;
>> > sendfile on;
>> > client_header_timeout 3m;
>> > client_body_timeout 3m;
>> > send_timeout 3m;
>> > keepalive_timeout 0;
>> >
>> > If somebody can help me improving nginx config will be helpful to him. I
>> > apologize for bad engish :D
>>
>> What's the required bandwidth for the flv files? What is the bandwidth of
>> the connection of the system? What is the bandwidth of the uplink to the
>> Internet?
>>
>> Regards,
>> Dennis
>>
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>
>
>
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--
Geoffrey HARTZ

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