Hi Henning, No we are using a local graylog server, not cloud. I suppose if the bottleneck is log generation, it doesn’t matter how or where they are handled/sent. Amit *From: *Henning Westerholt <hw(a)gilawa.com> *Date: *Thursday, September 15, 2022 at 9:53 AM *To: *Amit <amit(a)brytecall.com> *Cc: *Kamailio (SER) - Users Mailing List <sr-users(a)lists.kamailio.org> *Subject: *RE: [SR-Users] Log levels severely impacts performance Hello Amit, this sounds strange. If you send them remotely it should not really affect the operation anymore. Maybe it’s a special limitation of the cloud server, if you use a public cloud service provider, but just guessing here. Cheers, Henning -- Henning Westerholt – https://skalatan.de/blog/ Kamailio services – https://gilawa.com *From:* Amit <amit(a)brytecall.com> *Sent:* Thursday, September 15, 2022 3:16 PM *To:* Henning Westerholt <hw(a)gilawa.com> *Cc:* Kamailio (SER) - Users Mailing List <sr-users(a)lists.kamailio.org> *Subject:* Re: [SR-Users] Log levels severely impacts performance Hi Henning, We are actually sending the logs directly to our local graylog server via the $programname property in rsyslog, and we’ve disabled writing Kamailio logs to disk (i.e. only in memory by setting Storage=volatile in rsyslog.conf) but that didn’t seem to help with the application socket receive buffer backlog. Keep in mind that for testing purposes, I am blasting Kamailio with a fixed 2000 simultaneous registrations, so at log level 2 it really struggles and the socket buffer quickly fills up. Reducing the log level to 1 allows Kamailio to rip through the requests and the buffer stays at 0. ____________________ Amit Nir, MBA Office: 305.999.0911 www.BryteCall.com *From: *Henning Westerholt <hw(a)gilawa.com> *Date: *Thursday, September 15, 2022 at 9:01 AM *To: *Amit <amit(a)brytecall.com> *Cc: *Kamailio (SER) - Users Mailing List <sr-users(a)lists.kamailio.org> *Subject: *RE: [SR-Users] Log levels severely impacts performance Hello, how much are you actually logging? As already suggested, maybe just need to decrease the amount of log messages. If you need this much logging, you can of course forward it to a dedicated log server over the network. Cheers, Henning -- Henning Westerholt – https://skalatan.de/blog/ Kamailio services – https://gilawa.com *From:* Amit <amit(a)brytecall.com> *Sent:* Thursday, September 15, 2022 1:33 PM *To:* Henning Westerholt <hw(a)gilawa.com> *Cc:* Kamailio (SER) - Users Mailing List <sr-users(a)lists.kamailio.org> *Subject:* Re: [SR-Users] Log levels severely impacts performance Hi Henning, Thanks for the suggestion. Disk I/O was our initial assumption on another Kamilio instance we are running. To test this theory we installed Kamailio on separate hardware and configurations with faster underlying SSD disks, however we are seeing the same crippled performance and congestion in the applications socket receive buffer when LOG level is set to INFO (2). ____________________ Amit Nir, MBA Office: 305.999.0911 www.BryteCall.com On Sep 15, 2022, at 6:14 AM, Henning Westerholt <hw(a)gilawa.com> wrote:  Hello, additionally, try to see if you have some general I/O issues, e.g., by observing io-wait CPU, looking to I/O transaction times with monitoring tools etc.. Maybe there are other services also causing excessive I/O. Cheers, Henning -- Henning Westerholt – https://skalatan.de/blog/ Kamailio services – https://gilawa.com *From:* sr-users <sr-users-bounces(a)lists.kamailio.org> *On Behalf Of *Daniel-Constantin Mierla *Sent:* Wednesday, September 14, 2022 2:25 PM *To:* Kamailio (SER) - Users Mailing List <sr-users(a)lists.kamailio.org>rg>; Amit <amit(a)brytecall.com> *Subject:* Re: [SR-Users] Log levels severely impacts performance Hello, excessive logging is known to impact the performances. If you have many log messages printed from config, try to reduce them. Performance could be also a matter of how many child processes you created, via the children global parameter. Cheers, Daniel On 14.09.22 04:18, Amit wrote: Hello, We’ve been running Kamailio 5.5.0 for a while now and recently ran into an issue where the application buffer would get full and Kamailio has a lot of difficulty keeping up with REG requests. This severely impacted Kamailio’s ability to perform and resulted in many REG timeouts. Running ‘watch netstat -ulpn’ revealed the buffer issue. We usually run the production system at log level INFO (2) and had not ran into any issues in the past. When the buffer issue occurred and after some testing, we discovered that changing the log level to NOTICE (1) was sufficient to bring the system back into operational status. For example, at log level INFO (2) we seem to achieve ~150-200 REG/s while at log level NOTICE (1) we reach ~500-700 REG/s. I did find this article in the wiki and tried using the “-“ in front of the log path but this didn’t seem to help. http://www.kamailio.org/wiki/tutorials/3.2.x/syslog Even writing the logs directly to our external log server and preventing them from being written to the local disk doesn’t seem to alleviate the issue when the log level is set to INFO (2). Does anyone have any experience with this or have any suggestions? We are finding it difficult to scale as a result of this issue. Thank you in advance. Amit __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions * sr-users(a)lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe: * https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users -- Daniel-Constantin Mierla -- www.asipto.com www.twitter.com/miconda -- www.linkedin.com/in/miconda __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions * sr-users(a)lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe: * https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users

Does anyone have any experience with this or have any suggestions? We are finding it difficult to scale as a result of this issue.

On Sep 15, 2022, at 5:18 PM, Henning Westerholt <hw(a)gilawa.com> wrote: Hello, Kamailio is using the system interface for syslog, this is also a code which is quite stable and has not seen a lot of changes in the last years. People are using Kamailio with a lot of logging in high load situation usually without problems, there has not been a lot of reports about that in the past. Maybe it something related to a specific distribution version? I checked, the rsyslog is using asynchronous writing as default since a long time. What logging engine do you use? Cheers, Henning -- Henning Westerholt - https://skalatan.de/blog/ Kamailio services - https://gilawa.com -----Original Message----- From: sr-users <sr-users-bounces(a)lists.kamailio.org> On Behalf Of Jeremy Kister Sent: Thursday, September 15, 2022 9:59 PM To: sr-users(a)lists.kamailio.org Subject: Re: [SR-Users] Log levels severely impacts performance On 9/13/2022 10:18 PM, Amit wrote: I was just dealing with this behavior. I was logging to a local rsyslog and rsyslog was just writing to a file on a local ssd (unsynced). It's a ton of log. But meh. I disabled syslog entirely and enabled log_stderror = yes Then I just captured stdout+stderr via multilog and write it to a file on the disk. The problem went away. I think there is some huge overhead in the way kam packages up the log and sends it out to syslog. -- Jeremy Kister https://jeremy.kister.net./ __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions * sr-users(a)lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe: * https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions * sr-users(a)lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe: * https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users

On Sep 15, 2022, at 10:54 PM, Amit <amit(a)brytecall.com> wrote: I’ve already added the “-“ in front of the log file and that didn’t seem to make any recognizable difference.

On Sep 15, 2022, at 10:54 PM, Amit <amit@brytecall.com<mailto:amit@brytecall.com>> wrote: I’ve already added the “-“ in front of the log file and that didn’t seem to make any recognizable difference.

Does anyone have any experience with this or have any suggestions? We are finding it difficult to scale as a result of this issue.