I've been working with this also, and I don't understand the decision process that OpenSER uses to select its UDP buffer size.
1. The system default is 128 Kb. When I start OpenSER without changing any settings, it uses a 128 Kb buffer size. 2. I changed the OS buffer to 256 kb (sysctl -w net.core.rmem_max=262144). OpenSER starts, and says: INFO:core:probe_max_receive_buffer: using a UDP receive buffer of 255 kb OK, so far so good. 3. So next I set the OS buffer to 1 Mb (sysctl -w net.core.rmem_max=1048576). I did not set the MAX_RECV_BUFFER_SIZE or use -b. Openser starts and says: INFO:core:probe_max_receive_buffer: using a UDP receive buffer of 512 kb Hmmm, that's strange.... 4. I start Openser with -b 1048576. Openser says: INFO:core:probe_max_receive_buffer: using a UDP receive buffer of 2048 kb 2 Mb? The OS limit is 1 Mb... That can't be right. 5. I've been fiddling with various numbers for -b, and if I use 1024, Openser says: INFO:core:probe_max_receive_buffer: using a UDP receive buffer of 124 kb 6. If I use -b 1024000, Openser says: INFO:core:probe_max_receive_buffer: using a UDP receive buffer of 2000 kb So now I'm confused. I can't get Openser to give me a UDP buffer size of 1 Mb, it seems to settle on either 512 Kb or 2 Mb. Am I missing something? This is with 1.3.2. Michael Young -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bogdan-Andrei Iancu Sent: Wednesday, April 09, 2008 7:37 AM To: Carsten Bock Cc: users@lists.openser.org Subject: Re: [OpenSER-Users] UDP Buffer Size / OpenSER / Linux 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 >>> >>> _______________________________________________ >>> Users mailing list >>> Users@lists.openser.org >>> http://lists.openser.org/cgi-bin/mailman/listinfo/users >>> >>> >>> > > > _______________________________________________ Users mailing list Users@lists.openser.org http://lists.openser.org/cgi-bin/mailman/listinfo/users No virus found in this incoming message. Checked by AVG. Version: 7.5.519 / Virus Database: 269.22.9/1365 - Release Date: 4/8/2008 7:30 AM No virus found in this outgoing message. Checked by AVG. Version: 7.5.524 / Virus Database: 269.23.21/1456 - Release Date: 5/20/2008 6:45 AM _______________________________________________ Users mailing list Users@lists.openser.org http://lists.openser.org/cgi-bin/mailman/listinfo/users
