Hello all!
We are running Kamailio version 5.3.3 with 16 small Asterisk servers. Kamailio uses a dispatcher module to distribute calls. Algorithm #11 is selected. All destinations are configured with priority set to 50 and attribute to rweight=50.
We noticed that one server constantly receives more calls than others. I run a few tests. I was sending 1000 calls to the system. 4 per second. All servers except one were getting around 60 calls while the last one - around 100.
I then noticed that the server which receives most calls is always last in the "kamcmd dispatcher.list" command output. I then changed the order in the dispatcher DB table and repeat the test. The other server that now was last was getting the most calls.
Does anyone else use algorithm #11 and finds the same thing? Is there something additional that I can provide to help with the investigation?
Thanks!
I noticed the exact same behaviour with my implementation, even though the priority and rweight are different. until now, i'm ignoring the "issue". But if there is a fix, I would like to know too.
*Sérgio Charrua*
*www.voip.pt http://www.voip.pt/* Tel.: +351 callto:+351+91+104+12+6621 130 71 77
Email : *sergio.charrua@voip.pt sergio.charrua@voip.pt*
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On Thu, Dec 10, 2020 at 10:20 AM Володимир Іванець volodyaivanets@gmail.com wrote:
Hello all!
We are running Kamailio version 5.3.3 with 16 small Asterisk servers. Kamailio uses a dispatcher module to distribute calls. Algorithm #11 is selected. All destinations are configured with priority set to 50 and attribute to rweight=50.
We noticed that one server constantly receives more calls than others. I run a few tests. I was sending 1000 calls to the system. 4 per second. All servers except one were getting around 60 calls while the last one - around 100.
I then noticed that the server which receives most calls is always last in the "kamcmd dispatcher.list" command output. I then changed the order in the dispatcher DB table and repeat the test. The other server that now was last was getting the most calls.
Does anyone else use algorithm #11 and finds the same thing? Is there something additional that I can provide to help with the investigation?
Thanks!
Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
Hello,
that's how the algorithm is implemented and the last one has more calls because it is used to fill the slots left empty because of truncation in percentage computation.
The weight is a percentage as an integer value, practically an integer from 1 to 100.
So, if you have 16 gateways to route to with dispatcher, each with weight 50, then the sum of weights is 800. The percentage corresponding to each gateway is computed with (50/800)*100 = 6.25, converted to integer is 6.
Now, 6*16=96, so 4 slots were left empty, which are filled with the last destination that results in 10 slots for it.
I haven't implemented the rweight algorithm, but for the weight algorithm is expected to set the value to an integer from 1 to 100 and have the sum of them to be 100, otherwise also the last gateway fills the empty slots. Moreover, if the sum exceeds 100, then the gateways that end up after the 100 slots will be ignored.
Note that there are other algorithms if you want even distribution, like round robin or call load balancing.
Cheers, Daniel
On 10.12.20 12:00, Sergio Charrua wrote:
I noticed the exact same behaviour with my implementation, even though the priority and rweight are different. until now, i'm ignoring the "issue". But if there is a fix, I would like to know too.
*Sérgio Charrua*
*www.voip.pt http://www.voip.pt/* Tel.: +351 callto:+351+91+104+12+6621 130 71 77
Email : *sergio.charrua@voip.pt mailto:sergio.charrua@voip.pt*
This message and any files or documents attached are strictly confidential or otherwise legally protected.
It is intended only for the individual or entity named. If you are not the named addressee or have received this email in error, please inform the sender immediately, delete it from your system and do not copy or disclose it or its contents or use it for any purpose. Please also note that transmission cannot be guaranteed to be secure or error-free.
On Thu, Dec 10, 2020 at 10:20 AM Володимир Іванець <volodyaivanets@gmail.com mailto:volodyaivanets@gmail.com> wrote:
Hello all! We are running Kamailio version 5.3.3 with 16 small Asterisk servers. Kamailio uses a dispatcher module to distribute calls. Algorithm #11 is selected. All destinations are configured with priority set to 50 and attribute to rweight=50. We noticed that one server constantly receives more calls than others. I run a few tests. I was sending 1000 calls to the system. 4 per second. All servers except one were getting around 60 calls while the last one - around 100. I then noticed that the server which receives most calls is always last in the "kamcmd dispatcher.list" command output. I then changed the order in the dispatcher DB table and repeat the test. The other server that now was last was getting the most calls. Does anyone else use algorithm #11 and finds the same thing? Is there something additional that I can provide to help with the investigation? Thanks! _______________________________________________ Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org <mailto:sr-users@lists.kamailio.org> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users <https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users>
Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
Hello Daniel,
Thank you for the explanation!
чт, 10 груд. 2020 о 15:04 Daniel-Constantin Mierla miconda@gmail.com пише:
Hello,
that's how the algorithm is implemented and the last one has more calls because it is used to fill the slots left empty because of truncation in percentage computation.
The weight is a percentage as an integer value, practically an integer from 1 to 100.
So, if you have 16 gateways to route to with dispatcher, each with weight 50, then the sum of weights is 800. The percentage corresponding to each gateway is computed with (50/800)*100 = 6.25, converted to integer is 6.
Now, 6*16=96, so 4 slots were left empty, which are filled with the last destination that results in 10 slots for it.
I haven't implemented the rweight algorithm, but for the weight algorithm is expected to set the value to an integer from 1 to 100 and have the sum of them to be 100, otherwise also the last gateway fills the empty slots. Moreover, if the sum exceeds 100, then the gateways that end up after the 100 slots will be ignored.
Note that there are other algorithms if you want even distribution, like round robin or call load balancing.
Cheers, Daniel On 10.12.20 12:00, Sergio Charrua wrote:
I noticed the exact same behaviour with my implementation, even though the priority and rweight are different. until now, i'm ignoring the "issue". But if there is a fix, I would like to know too.
*Sérgio Charrua*
*www.voip.pt http://www.voip.pt/* Tel.: +351 callto:+351+91+104+12+6621 130 71 77
Email : *sergio.charrua@voip.pt sergio.charrua@voip.pt*
This message and any files or documents attached are strictly confidential or otherwise legally protected.
It is intended only for the individual or entity named. If you are not the named addressee or have received this email in error, please inform the sender immediately, delete it from your system and do not copy or disclose it or its contents or use it for any purpose. Please also note that transmission cannot be guaranteed to be secure or error-free.
On Thu, Dec 10, 2020 at 10:20 AM Володимир Іванець < volodyaivanets@gmail.com> wrote:
Hello all!
We are running Kamailio version 5.3.3 with 16 small Asterisk servers. Kamailio uses a dispatcher module to distribute calls. Algorithm #11 is selected. All destinations are configured with priority set to 50 and attribute to rweight=50.
We noticed that one server constantly receives more calls than others. I run a few tests. I was sending 1000 calls to the system. 4 per second. All servers except one were getting around 60 calls while the last one - around 100.
I then noticed that the server which receives most calls is always last in the "kamcmd dispatcher.list" command output. I then changed the order in the dispatcher DB table and repeat the test. The other server that now was last was getting the most calls.
Does anyone else use algorithm #11 and finds the same thing? Is there something additional that I can provide to help with the investigation?
Thanks!
Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
Kamailio (SER) - Users Mailing Listsr-users@lists.kamailio.orghttps://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
-- Daniel-Constantin Mierla -- www.asipto.comwww.twitter.com/miconda -- www.linkedin.com/in/miconda Funding: https://www.paypal.me/dcmierla
Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
-
Daniel-Constantin Mierla -
Sergio Charrua -
Володимир Іванець