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Date:      Sun, 14 Sep 2014 14:05:02 -0700
From:      Adrian Chadd <adrian@freebsd.org>
To:        Bram Van Steenlandt <bram@diomedia.be>
Cc:        FreeBSD Questions <freebsd-questions@freebsd.org>
Subject:   Re: Listen queue guestion
Message-ID:  <CAJ-VmomZ8PEn-6DUmF6HfRLcst72aRDVfiiiG_N1uBT3_nZJsw@mail.gmail.com>
In-Reply-To: <5415EC27.40708@diomedia.be>
References:  <5415EC27.40708@diomedia.be>

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Hi!

What kind of sockets is it specifically using?


-a


On 14 September 2014 12:27, Bram Van Steenlandt <bram@diomedia.be> wrote:
> Hi,
>
> I'm porting an plc automation system to freebsd and while doing so I got
> errors like these:
> sonewconn: pcb 0xfffff8000cecc870: Listen queue overflow: 76 already in
> queue awaiting acceptance
>
> With the help of netstat I've found the problem, 2 programs communicate with
> ipc file like sockets and the "client" was connecting too fast (it was
> connecting and disconnecting in a small for loop).
>
> Still, on linux this worked and there will be cases where I may bump in to
> this limit again (a lot of different programs communicate with one master
> program over ipc).
>
> I've found kern.ipc.somaxconn but this seems to be only for TCP connections.
>
> Is there a sysctl or kernel parameter that allows me to set this queue a bit
> larger ?
>
> Thx
> Bram
>
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