Re: kernel: sonewconn: pcb 0xfffff8002b255a00 (local:/var/run/devd.seqpacket.pipe): Listen queue overflow: 1 already in queue awaiting acceptance (60 occurrences), ?

On 20/06/2023 15:41, Gary Jennejohn wrote:
> On Tue, 20 Jun 2023 12:04:13 +0200
> Alexander Leidinger<Alexander@leidinger.net>  wrote:
>
>> Quoting Gary Jennejohn<garyj@gmx.de>  (from Tue, 20 Jun 2023 07:41:08 +0000):
>>
>>> …
>> In other words the software listening on it didn't process the request
>> fast enough and a backlog piled up (e.g apache ListenBacklog or nginx
>> "listen X backlog=y" and "sysctl kern.ipx.somaxconn=X" for FreeBSD
>> itself). You may need faster hardware, more processes/threads to
>> handle the traffic, or configure your software to do less to produce
>> the same result (e.g. no real-time DNS resolution in the logging of a
>> webserver or increasing the amount of allowed items in the backlog).
>> If you can change the software, there's also the possibility to switch
>> from blocking sockets to non-blocking sockets (to not have the
>> select/accept loop block / run into contention) or kqueue.
>>
> On my FreeBSD14 system these things are all under kern.ipc.
>
> maxconn seems to be an alias for soacceptqueue, which is set to 128 on
> my machine.
>
> However, the software he's using may have set backlog to 1.  Hard to say
> based on the trace he provided.

Thanks, people.

A few hours ago I took a hint from one of the pages linked from 
<https://dan.langille.org/2020/01/01/listen-queue-overflow/>, added a 
line to my sysctl.conf(5).


% sysctl kern.ipc.soacceptqueue
kern.ipc.soacceptqueue: 256
% sysctl kern.ipc.maxconn
sysctl: unknown oid 'kern.ipc.maxconn'
% sysctl kern.ipc.somaxconn
kern.ipc.somaxconn: 256
% grep ipc /etc/sysctl.conf
kern.ipc.soacceptqueue=256
%


I began wondering about the sonewconn lines in relation to 
<https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270997> for 
net-mgmt/netdata, although I don't know whether there's a direct 
relationship.

% netstat -Lan | grep netdata
unix  0/0/128                          /tmp/netdata-ipc
%

My use of Netdata is local-only.