>>> The load(nload) of 1500+ concurrent connections with 1Gbps port is : Curr: 988.95 MBit/s
>> Just to say... You are already hitting 1Gbits with a 1Gbit port...
>> It's normal that is slow... no?
>+1. I'm not seeing the problem here.
Exactly, the issue is crystal clear. You are already hitting your max bandwidth with 1500+ concurrent connections, of course with 2000+ concurrent connections users will notice severe slowdowns. You have not enough bandwidth to serve your clients.
I suggest to monitor your eth0 links carefully and upgrade to either multiple bonded 1Gig links, 10gig links or more servers.
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