Fwd: systat -ip, socket buffer full

[Raimund Sacherer]

On Thu, May 24, 2018 at 8:16 PM Eugene Grosbein <eugen at grosbein.net> wrote:

> 24.05.2018 21:09, Ray wrote:
>
> > when checking systat -ip I see the value for "socket buffer full" with
> > values different from 0, I see 1, 2, up to 55 in one occasion.
> >
> > I asked on IRC and it was mentioned I should try to up
> > kern.ipc.soacceptqueue to 1024 from the default 128, but I could still
> see
> > values over 0 in "socket buffer full".
> >
> > How can I tune this buffer?
> >
> > We have a lot of UDP traffic (the server is a PBX serving around 200
> agents
> > with avg 50 concurrent calls.
>
> Each (udp) socket has its own limit on receiving buffer size and it is
> application's duty
> to set its size to right value using setsockopt() function.
> You should read your PBX manual on how to configure it to use larger
> buffers.
>
I will check this out.


>
> As last resort, you can raise sysctl kern.ipc.maxsockbuf that establishes
> default value
> for size of such buffers that is used when application does not change
> defaults.
> However, it may affect many applications in the system and lead to
> overflow of kernel memory pools
> unless you know what are you doing, has plenty of free physical memory and
> raised kernel limits
> accordingly, so better start with PBX documentation.
>
Thank you, I might try that, i checked and the value on my system is
2097152. How can I check if I hit this buffer wall? Is there a monitoring
tool which can tell me more stats about this buffer use?

Thank you,
best
Ray