[Users] TCP problems under high load

[Klaus Darilion]

Daniel-Constantin Mierla wrote:
> Hello,
> 
> this looks like the TCP kernel buffer is overflows. How many OpenSER TCP 
> processes do you have?
> 

children=100, --> ~208 processes. How can a TCP kernel buffer overflow? 
Shouldn't TCP flow control take care of this?

regards
klaus

> Cheers,
> Daniel
> 
> 
> On 07/26/06 15:44, Klaus Darilion wrote:
>> Sorry - forgotten to attach the files :-)
>>
>> klaus
>>
>> Klaus Darilion wrote:
>>> Hi!
>>>
>>> I suspect openser to have TCP problems under high load:
>>> Scenario: sipp sends INVITE to openser, which replies with 404
>>> I have 4x sipp with 1000 INVITEs/s and 1x sipp with 3000INVITEs/s, 
>>> thus 5 TCP connections
>>>
>>> After some time, I get error on the TCP connection with 3000INVITEs/s:
>>> -->syslog.txt
>>>
>>> Looks like the first part of the request is missing, but sniffing 
>>> revealed that the request is proper formated as you see in the TCP 
>>> packet -->ngrep.txt
>>>
>>> Are there known high-load problems?
>>>
>>> Any ideas how I can debug this?
>>>
>>> regards
>>> klaus
>>>
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at openser.org
>>> http://openser.org/cgi-bin/mailman/listinfo/users
>>
>> ------------------------------------------------------------------------
>>
>> graham:/home/darilion# ngrep -I test6.cap -q 106789
>> input: test6.cap
>>
>> T 83.136.32.91:32904 -> 83.136.32.132:5060 [A]
>>   INVITE sip:service at 83.136.32.132:5060 SIP/2.0..Via: SIP/2.0/TCP 
>> 83.136.32.91:5062;branch=z9hG4bK-106789-0..From: sipp 
>> <sip:sipp at 83.136.32.91:5062>;tag=106789..To:
>>    sut <sip:service at 83.136.32.132:5060>..Call-ID: 
>> 106789-10754 at 83.136.32.91..CSeq: 1 INVITE..Contact: 
>> sip:sipp at 83.136.32.91:5062..Max-Forwards: 70..Subject: Perform
>>   ance Test..Content-Type: application/sdp..Content-Length:  
>> 135....v=0..o=user1 53655765 2353687637 IN IP4 83.136.32.91..s=-..c=IN 
>> IP4 83.136.32.91..t=0 0..m=audio
>>    6002 RTP/AVP 0..a=rtpmap:0 PCMU/8000..INVITE 
>> sip:service at 83.136.32.132:5060 SIP/2.0..Via: SIP/2.0/TCP 
>> 83.136.32.91:5062;branch=z9hG4bK-106790-0..From: sipp <sip:
>>   sipp at 83.136.32.91:5062>;tag=106790..To: sut 
>> <sip:service at 83.136.32.132:5060>..Call-ID: 
>> 106790-10754 at 83.136.32.91..CSeq: 1 INVITE..Contact: 
>> sip:sipp at 83.136.32.91:5
>>   062..Max-Forwards: 70..Subject: Performance Test..Content-Type: 
>> application/sdp..Content-Length:  135....v=0..o=user1 53655765 
>> 2353687637 IN IP4 83.136.32.91..s=-
>>   ..c=IN IP4 83.136.32.91..t=0 0..m=audio 6002 RTP/AVP 0..a=rtpmap:0 
>> PCMU/8000..INVITE sip:service at 83.136.32.132:5060 SIP/2.0..Via: 
>> SIP/2.0/TCP 83.136.32.91:5062;br
>>   anch=z9hG4bK-106791-0..From: sipp 
>> <sip:sipp at 83.136.32.91:5062>;tag=106791..To: sut 
>> <sip:service at 83.136.32.132:5060>..Call-ID: 
>> 106791-10754 at 83.136.32.91..CSeq: 1 I
>>   NVITE..Contact: sip:sipp at 83.136.32.91:5062..Max-Forwards: 
>> 70..Subject: Performance Test..Content-Type: 
>> application/sdp..Content-Length:  135....v=0..o=u
>>   
>> ------------------------------------------------------------------------
>>
>> graham:/home/darilion# Jul 26 14:29:08 graham 
>> /usr/sbin/openser[19736]: ERROR:parse_first_line: method not followed 
>> by SP
>> Jul 26 14:29:08 graham /usr/sbin/openser[19736]: 
>> ERROR:parse_first_line: bad message
>> Jul 26 14:29:08 graham /usr/sbin/openser[19736]: ERROR: parse_msg: 
>> message=<-106789-0^M From: sipp 
>> <sip:sipp at 83.136.32.91:5062>;tag=106789^M To: sut 
>> <sip:service at 83.136.32.132:5060>^M Call-ID: 
>> 106789-10754 at 83.136.32.91^M CSeq: 1 INVITE^M Contact: 
>> sip:sipp at 83.136.32.91:5062^M Max-Forwards: 70^M Subject: Performance 
>> Test^M Content-Type: application/sdp^M Content-Length:  135^M ^M v=0^M 
>> o=user1 53655765 2353687637 IN IP4 83.136.32.91^M s=-^M c=IN IP4 
>> 83.136.32.91^M t=0 0^M m=audio 6002 RTP/AVP 0^M a=rtpmap:0 PCMU/8000^M >
>> Jul 26 14:29:08 graham /usr/sbin/openser[19736]: ERROR: receive_msg: 
>> parse_msg failed
>>   
>> ------------------------------------------------------------------------
>>
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