[Bug 219655] TCP Connection Limit Error - sonewconn: Listen queue overflow

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219655

            Bug ID: 219655
           Summary: TCP Connection Limit Error - sonewconn: Listen queue
                    overflow
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: john.leo at gmail.com

I'm currently running FreeNas 11 RC1.  I've edited the tunables for this item
kern.ipc.soacceptqueue to allow for 2048 connections, but it doesn't propagate
to the jails on my system.  Below is the error I received saying the listen
queue is full.

May 19 18:43:24 maverick kernel: sonewconn: pcb 0xfffff8035bef6740: Listen
queue overflow: 193 already in queue awaiting acceptance (138 occurrences)
May 19 19:02:16 maverick kernel: sonewconn: pcb 0xfffff8035bef6740: Listen
queue overflow: 193 already in queue awaiting acceptance (200 occurrences)
May 19 19:03:17 maverick kernel: sonewconn: pcb 0xfffff8035bef6740: Listen
queue overflow: 193 already in queue awaiting acceptance (209 occurrences)
May 19 19:04:17 maverick kernel: sonewconn: pcb 0xfffff8035bef6740: Listen
queue overflow: 193 already in queue awaiting acceptance (199 occurrences)
May 19 19:05:17 maverick kernel: sonewconn: pcb 0xfffff8035bef6740: Listen
queue overflow: 193 already in queue awaiting acceptance (202 occurrences)

Here are the Netstat outputs from my main FreeNas system:
tcp4  0/0/2048                         127.0.0.1.8542
tcp4  0/0/2048                         127.0.0.1.8600
tcp4  0/0/2048                         127.0.0.1.8500
tcp4  0/0/2048                         127.0.0.1.8400

And the output from Netstat for my jail:

tcp4  0/0/128                          192.168.0.20.12348
tcp6  0/0/128                          *.51413
tcp4  0/0/128                          *.51413
tcp4  0/0/128                          *.9091

If I run sysctl kern.ipc.soacceptqueue in the jail it shows the following:

# sysctl kern.ipc.soacceptqueue
kern.ipc.soacceptqueue: 2048

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