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

[Bogdan-Andrei Iancu]

Hi Carsten,

MAX_RECV_BUFFER_SIZE (or -b cl param) is used only as upper limit when auto discovery/setting the socket buffer. 


Regards,
Bogdan

Carsten Bock wrote:
> 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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>>>
>>>   
>>>       
>
>
>