[SR-Users] dispatcher algorithm 11, no more than 25 hosts in group for proper distribution

[Julien Chavanton]

Hi Ivan, must be a limitation/problem in the computation, can you open an
issue.

Since I have built on top of algorithm 11, I could have a look, we may also
notify the original author to see what can be done.

On Tue, Mar 30, 2021 at 8:52 AM Ivan Matvieiev <i.matvieiev at kwebbl.com>
wrote:

> Hello Community,
>
> There is a module dispatcher and sharing algorithm 11 that features
> the ability to redistribute load when the host is enabled or disabled
> that is quite valuable for me.
> In the test lab I faced unexpected behavior:
> - when I add to group <=25 hosts algorithm behaves as per description.
> - when a group includes 26 or more hosts, and 100 calls are done for
> instance, then about 25 go to the first host and 75 are distributed
> among the rest of hosts.
>
> Expected behavior: all hosts of the group having the same rweight
> value must receive the same amount of calls no mater what number of
> hosts is in the group.
>
> Could you please to help to figure out what is wrong and why when the
> dispatcher group consists of 26+ hosts dispatching algorithm 11
> behaves differently than when group consists of 25 or less of hosts?
>
> Some configuration notes:
> # module configs
> modparam("dispatcher", "list_file", "/etc/kamailio/dispatcher.list")
> modparam("dispatcher", "flags", 2)
> modparam("dispatcher", "ds_ping_method", "OPTIONS")
> modparam("dispatcher", "ds_probing_threshold", 3)
> modparam("dispatcher", "ds_inactive_threshold", 10)
> modparam("dispatcher", "ds_probing_mode", 3)
> modparam("dispatcher", "ds_ping_interval", 10)
> modparam("dispatcher", "ds_ping_reply_codes", "501,403,404,400,200")
> modparam("dispatcher", "ds_ping_from",DS_PING_FROM_PARAM)
> modparam("dispatcher", "use_default", 0)
>
> # dispatching algorithm call
> if ( ds_is_from_list("101")) {
>      sl_send_reply("100","My calls");
>      ds_select_dst("100", "11");
>      return;
> }
>
> # dispatcher list group config
> 100 sip:10.60.27.123:7000 0 10 rweight=50
> 100 sip:10.60.27.123:7001 0 10 rweight=50
> 100 sip:10.60.27.123:7002 0 10 rweight=50
> 100 sip:10.60.27.123:7003 0 10 rweight=50
> 100 sip:10.60.27.123:7004 0 10 rweight=50
> 100 sip:10.60.27.123:7005 0 10 rweight=50
> 100 sip:10.60.27.123:7006 0 10 rweight=50
> 100 sip:10.60.27.123:7007 0 10 rweight=50
> 100 sip:10.60.27.123:7008 0 10 rweight=50
> 100 sip:10.60.27.123:7009 0 10 rweight=50
> 100 sip:10.60.27.123:7010 0 10 rweight=50
> 100 sip:10.60.27.123:7011 0 10 rweight=50
> 100 sip:10.60.27.123:7012 0 10 rweight=50
> 100 sip:10.60.27.123:7013 0 10 rweight=50
> 100 sip:10.60.27.123:7014 0 10 rweight=50
> 100 sip:10.60.27.123:7015 0 10 rweight=50
> 100 sip:10.60.27.123:7016 0 10 rweight=50
> 100 sip:10.60.27.123:7017 0 10 rweight=50
> 100 sip:10.60.27.123:7018 0 10 rweight=50
> 100 sip:10.60.27.123:7019 0 10 rweight=50
> 100 sip:10.60.27.123:7020 0 10 rweight=50
> 100 sip:10.60.27.123:7021 0 10 rweight=50
> 100 sip:10.60.27.123:7022 0 10 rweight=50
> 100 sip:10.60.27.123:7023 0 10 rweight=50
> 100 sip:10.60.27.123:7024 0 10 rweight=50
>
> Kamailio version:
> kamailio -v
> version: kamailio 5.4.4 (x86_64/linux) e16352
> flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS,
> DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC,
> F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX,
> FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR,
> USE_DST_BLACKLIST, HAVE_RESOLV_RES
> ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE
> 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
> poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
> id: e16352
> compiled on 15:56:46 Feb 15 2021 with gcc 4.8.5
>
> System info
> CentOS Linux release 7.7.1908 (Core)
> Linux test-carrier-1.loc 3.10.0-1062.4.1.el7.x86_64 #1 SMP Fri Oct 18
> 17:15:30 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
>
> _______________________________________________
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>
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