About kern.ipc.somaxconn and netstat

[Kubilay Kocak]

On 31/01/2013 4:54 AM, Efraín Déctor wrote:
> -----Mensaje original----- From: Kubilay Kocak
> Sent: Wednesday, January 30, 2013 3:25 AM
> To: Efraín Déctor
> Cc: freebsd-stable at freebsd.org
> Subject: Re: About kern.ipc.somaxconn and netstat
> 
> On 30/01/2013 12:26 PM, Efraín Déctor wrote:
>> Hello.
>>
>> We have a webserver using FreeBSD, we read about tunning
>> kern.ipc.somaxconn
>> (http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/configtuning-kernel-limits.html)
>> so the OS can handle all the connections. Is there a way to know how
>> many connections are established in a certain moment?. I know about
>> netstat(1) but is there any other command that we can use to know the
>> exact amount of how many connections are established?.
>>

> This one might help:
> 
> kern.ipc.numopensockets: Number of open sockets
> 
> It's usefulness will depend on the granularity you require (in only, out
> only, established only, etc) but it's always represented system-wide
> resource consumption very well (matching observed workloads - <some
> baseline value>)
> 

> 
> Thank you, it is very helpfull, using kern.ipc.numopensockets with
> sockstat(1) and netstat(1) will give me a clue to tune kern.ipc.somaxconn
> 
> Thank you all.

Also, if you haven't already come across this one in your netstat
travels, this one directly reports listen queue overflows:

netstat -s -p tcp |grep listen

--
Ta,

Koobs