[OpenSER-Users] UDP Buffer Size / OpenSER / Linux

[Carsten Bock]

Hi Bogdan,

i have another question regarding the UDP buffer size:
If we set the UDP-Buffer of the system to, let's say 1 MByte: Do we also
have to edit MAX_RECV_BUFFER_SIZE? What happens, if we don't? Looking at
udp_server.c it seems like this value is ignored...

Thank you,
Carsten


Am Dienstag, den 25.03.2008, 12:53 +0200 schrieb Bogdan-Andrei Iancu:
> Hi Klaus, Hi Carsten,
> 
> Setting a large buffer for the UDP socket will not solve the problem of 
> slow openser processing, but will solve the problem of temporary 
> overloads due a short traffic peek or due short openser blocking in an 
> synchronous op (like DNS or DB).  In such corner cases, the buffering in 
> the kernel socket will avoid message dropping.
> 
> Regards,
> Bogdan
> 
> Klaus Darilion wrote:
> > Carsten Bock schrieb:
> >   
> >> Hi,
> >>
> >> short question:
> >> Can anybody give me a hint regarding the Linux UDP-Buffer size? Are
> >> there any known good values for this or is the default value (128k) of
> >> Linux sufficient? I've read, regarding other SIP-Systems (namely IBM SIP
> >> Servlets and Communigate pro), the recommendation to increase the
> >> UDP-Buffer-size to 3 or even 4 MByte....
> >> Are there any recommended / known best values for heavy load OpenSER
> >> Installations?
> >>     
> >
> > IMO these values are too high. If the server is for any reason to slow 
> > to handle the load and the buffer fills up, then it might happen that 
> > the transactions are already timeout in the UAC when the SIP proxy 
> > starts processing the requests. If the proxy is overloaded IMO the 
> > requests should be dropped instead of queuing them for too long time.
> >
> > regards
> > klaus
> >
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> >   
>