Can you send us a 20+ lines of output from "vmstat 1" under this load? Also, what exact linux kernel are you running ("cat /proc/version")?
________________________________
> Date: Wed, 23 Jan 2013 21:51:43 +0500
> Subject: Re: Nginx flv stream gets too slow on 2000 concurrent connections
> From: shahzaib.cb@gmail.com
> To: nginx@nginx.org
>
> Following is the output of 3000+ concurrent connections on iostat 1
> command :-
>
> avg-cpu: %user %nice %system %iowait %steal %idle
> 1.72 2.96 0.47 0.12 0.00 94.73
>
> Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
> sda 22.47 1988.92 733.04 518332350 191037238
>
> avg-cpu: %user %nice %system %iowait %steal %idle
> 0.39 0.00 0.91 0.20 0.00 98.50
>
> Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
> sda 22.00 2272.00 0.00 2272 0
>
> avg-cpu: %user %nice %system %iowait %steal %idle
> 0.46 0.00 0.91 0.07 0.00 98.57
>
> Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
> sda 23.00 864.00 48.00 864 48
>
> avg-cpu: %user %nice %system %iowait %steal %idle
> 0.39 0.00 0.72 0.33 0.00 98.56
>
> Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
> sda 60.00 3368.00 104.00 3368 104
>
> avg-cpu: %user %nice %system %iowait %steal %idle
> 0.20 0.00 0.65 0.20 0.00 98.95
>
>
>
> On Wed, Jan 23, 2013 at 8:30 PM, shahzaib shahzaib
> <shahzaib.cb@gmail.com<mailto:shahzaib.cb@gmail.com>> wrote:
> Sketchboy, i sent you the output of only 1000 concurrent connections
> because it wasn't peak hours of traffic. I'll send you the output of
> iostat 1 when concurrent connections will hit to 2000+ in next hour.
> Please keep in touch cause i need to resolve this issue :(
>
>
> On Wed, Jan 23, 2013 at 8:21 PM, skechboy
> <nginx-forum@nginx.us<mailto:nginx-forum@nginx.us>> wrote:
> From your output I can see that it isn't IO issue, I wish I could help you
> more.
>
> Posted at Nginx Forum:
> http://forum.nginx.org/read.php?2,235447,235476#msg-235476<http://forum.nginx.org/read.php?2%2c235447%2c235476#msg-235476>
>
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