[kamailio/kamailio] dispatcher: algorithm 13 latency optimized round-robin with failover (#2493)
1 Oct
2020
1 Oct
'20
11:03 p.m.
#### Type Of Change
- [x] New feature (non-breaking change which adds new functionality)
#### Checklist:
- [x] Tested changes locally
#### Description
Previously discussed in the mailing list :
**“13” - latency optimized routing mode, the lowest latency gets higher priority (serial
forking ordered by priority, ds_ping_latency_stats is required).**
- The algorithm will load balance using round-robin prioritizing the gateways with the
highest priority.
- The priority will be lowered by 1 point every time the latency ms is as high as the
priority.
Using this simple formula : ADJUSTED_PRIORITY = PRIORITY - (ESTIMATED_LATENCY/PRIORITY)
GATEWAY | PRIORITY | ESTIMATED_LATENCY | ADJUSTED_PRIORITY | LOAD DISTRIBUTION
-- | -- | -- | -- | --
1 | 30 | 21 | 30 | 33%
2 | 30 | 91 | 27 | 0%
3 | 30 | 61 | 28 | 0%
4 | 30 | 19 | 30 | 33%
5 | 30 | 32 | 29 | 0%
6 | 30 | 0 | 30 | 33%
7 | 30 | 201 | 24 | 0%
You can view, comment on, or merge this pull request online at:
https://github.com/kamailio/kamailio/pull/2493
-- Commit Summary --
* dispatcher: algorithm 13
-- File Changes --
M src/modules/dispatcher/dispatch.c (43)
M src/modules/dispatcher/dispatch.h (1)
-- Patch Links --
https://github.com/kamailio/kamailio/pull/2493.patch
https://github.com/kamailio/kamailio/pull/2493.diff
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1 Oct
1 Oct
11:10 p.m.
@jchavanton pushed 1 commit.
473c42cb6bd83e8a9b3830230b638cda88fe24a8 dispatcher: algorithm 13
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3 Oct
3 Oct
6:13 p.m.
- I will make sure the GW are well sorted, not only the first pick.
- I am considering additional support for weight based distribution with optional
congestion control at equal priority.
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8 Oct
8 Oct
11:54 p.m.
@jchavanton pushed 1 commit.
d55861f172ebe14cafd9fac1d5a7b55afa5ea91b dispatcher: algorithm 13
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9 Oct
9 Oct
1:29 a.m.
@jchavanton pushed 1 commit.
47a95d0c7761d38ff88ec273681f2bb80c7c0e61 dispatcher: adding doc for algo 13
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3:47 a.m.
This pull request **introduces 1 alert** when merging
f7c98e2fa2539f01d29335e0dcbed16eeac5c52e into 9935dc8d28a1310084f597fd718af6a21255a799 -
[view on
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5 a.m.
This pull request **introduces 1 alert** when merging
[f7c98e2](https://github.com/kamailio/kamailio/commit/f7c98e2fa2539f01d29335…
into
[9935dc8](https://github.com/kamailio/kamailio/commit/9935dc8d28a1310084f597…
- [view on
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looked at it, `hash` is returned and can be `-1`
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14 Oct
14 Oct
7:50 p.m.
@jchavanton pushed 1 commit.
dbfe2d8310ba009b5ececf2053ea50b7daf91cf5 dispatcher: algorithm 13
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10:12 p.m.
This pull request **introduces 1 alert** when merging
dbfe2d8310ba009b5ececf2053ea50b7daf91cf5 into e3e6471b114b2358c20cbc9a60ee745ac1bce162 -
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26 Oct
26 Oct
4:50 p.m.
@jchavanton pushed 1 commit.
46745e567b7606add81d90db93930489b2179b9e dispatcher: algorithm 13
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7:02 p.m.
This pull request **introduces 1 alert** when merging
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10 Nov
10 Nov
5:27 a.m.
@jchavanton pushed 1 commit.
5676a0d4f57aa80b3a670ecfb4b0fc53a3b5e532 dispatcher: algorithm 13
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7:36 a.m.
This pull request **introduces 1 alert** when merging
b793b967753f1ae86b2b4bf2b4ddd064bc45c4c5 into e9624bc4823cfba0bd9536a70b9eeadecb2a537e -
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11 Nov
11 Nov
12:31 a.m.
@asalman18 commented on this pull request.
+ z, ds_dest->uri.len, ds_dest->uri.s,
+ gw_priority, latency_proirity_handicap,
+ ds_dest->attrs.rpriority, gw_latency, ds_dest->flags);
+ } else {
+ ds_sorted[y].idx = -1;
+ ds_sorted[y].priority = -1;
+ LM_DBG("[inactive]idx[%d]uri[%.*s]priority[%d]latency[%dms]flag[%d]",
+ z, ds_dest->uri.len, ds_dest->uri.s,
+ gw_priority, gw_latency, ds_dest->flags);
+ }
+ if(ds_use_default != 0 && idx->nr != 1)
+ z = (z + 1) % (idx->nr - 1);
+ else
+ z = (z + 1) % idx->nr;
+ }
+ idx->last = hash % idx->nr;
should be removed
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12:47 a.m.
@asalman18 commented on this pull request.
@@ -2270,6 +2372,15 @@ int ds_manage_routes(sip_msg_t
*msg, ds_select_state_t *rstate)
case DS_ALG_PARALLEL: /* 12 - parallel
dispatching */
hash = 0;
break;
+ case DS_ALG_LATENCY: /* 13 - latency optimized round-robin with failover */
+ lock_get(&idx->lock);
+ hash = ds_manage_route_algo13(idx, rstate);
+ lock_release(&idx->lock);
+ if (hash < 0)
Should we check if hash is -1 and not < 0
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1:41 a.m.
@jchavanton pushed 1 commit.
dfacc805c93a30e5197fccf1cf2b2712a5092e23 dispatcher: algorithm 13
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6:52 p.m.
@jchavanton pushed 1 commit.
b2ac69ef7d6531921209221578d7c7a0befe7b85 dispatcher: algorithm 13
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13 Nov
13 Nov
11:05 p.m.
load tests at 250CPS
3 gateways, one with excessive ( latency >30ms delta with the 2 others since a priority
of 30 is set)
```
URI: sip:147.75.65.247:5072
FLAGS: AP
PRIORITY: 30
ATTRS: {
BODY: latency=10
}
LATENCY: {
AVG: 10.039000
STD: 1.381000
EST: 37.871000
MAX: 60
TIMEOUT: 0
}
URI: sip:147.75.65.247:5071
FLAGS: AP
PRIORITY: 30
ATTRS: {
BODY: latency=250
}
LATENCY: {
AVG: 249.847000
STD: 5.377000
EST: 141.598000
MAX: 250
TIMEOUT: 0
}
URI: sip:147.75.65.247:5073
FLAGS: AP
PRIORITY: 30
LATENCY: {
AVG: 59.000000
STD: 0.000000
EST: 59.000000
MAX: 59
TIMEOUT: 0
}
```
algorithm is doing round-robin on GW5072 and GW5073 and keep GW5071 for failover
```
2(51) INFO: dispatcher [dispatch.c:2207]: ds_manage_route_algo13():
[active]idx[0]uri[sip:147.75.65.247:5072]priority[30-0=30]latency[10ms]flag[8]
2(51) INFO: dispatcher [dispatch.c:2207]: ds_manage_route_algo13():
[active]idx[1]uri[sip:147.75.65.247:5071]priority[30-8=22]latency[250ms]flag[8]
2(51) INFO: dispatcher [dispatch.c:2207]: ds_manage_route_algo13():
[active]idx[2]uri[sip:147.75.65.247:5073]priority[30-0=30]latency[0ms]flag[8]
2(51) INFO: dispatcher [dispatch.c:2224]: ds_manage_route_algo13():
priority[30]gateway_selected[0]next_index[1]
1(50) INFO: dispatcher [dispatch.c:2207]: ds_manage_route_algo13():
[active]idx[1]uri[sip:147.75.65.247:5071]priority[30-8=22]latency[250ms]flag[8]
1(50) INFO: dispatcher [dispatch.c:2207]: ds_manage_route_algo13():
[active]idx[2]uri[sip:147.75.65.247:5073]priority[30-0=30]latency[0ms]flag[8]
1(50) INFO: dispatcher [dispatch.c:2207]: ds_manage_route_algo13():
[active]idx[0]uri[sip:147.75.65.247:5072]priority[30-0=30]latency[10ms]flag[8]
1(50) INFO: dispatcher [dispatch.c:2224]: ds_manage_route_algo13():
priority[30]gateway_selected[2]next_index[0]
5(54) INFO: dispatcher [dispatch.c:2207]: ds_manage_route_algo13():
[active]idx[0]uri[sip:147.75.65.247:5072]priority[30-0=30]latency[10ms]flag[8]
5(54) INFO: dispatcher [dispatch.c:2207]: ds_manage_route_algo13():
[active]idx[1]uri[sip:147.75.65.247:5071]priority[30-8=22]latency[250ms]flag[8]
5(54) INFO: dispatcher [dispatch.c:2207]: ds_manage_route_algo13():
[active]idx[2]uri[sip:147.75.65.247:5073]priority[30-0=30]latency[0ms]flag[8]
5(54) INFO: dispatcher [dispatch.c:2224]: ds_manage_route_algo13():
priority[30]gateway_selected[0]next_index[1]
2(51) INFO: dispatcher [dispatch.c:2207]: ds_manage_route_algo13():
[active]idx[1]uri[sip:147.75.65.247:5071]priority[30-8=22]latency[250ms]flag[8]
2(51) INFO: dispatcher [dispatch.c:2207]: ds_manage_route_algo13():
[active]idx[2]uri[sip:147.75.65.247:5073]priority[30-0=30]latency[0ms]flag[8]
2(51) INFO: dispatcher [dispatch.c:2207]: ds_manage_route_algo13():
[active]idx[0]uri[sip:147.75.65.247:5072]priority[30-0=30]latency[10ms]flag[8]
2(51) INFO: dispatcher [dispatch.c:2224]: ds_manage_route_algo13():
priority[30]gateway_selected[2]next_index[0]
```
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19 Nov
19 Nov
7:57 a.m.
Thank you for the pull request, and also the announcement on the list.
Are there any more additions/refinements done from your side? Otherwise if there are no
objections it can be merged, i think.
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4:51 p.m.
Merged #2493 into master.
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