Re: topos_htable autoexpire not working

Hello,

I just had a quick look to the code. It seems that the topos_htable is using the branch_expire and dialog_expire values from topos.

But if you are setting these also to 60s, they should indeed expire the values.

Please check with the kamcmd htable RPC command the actual values of some entries, and if they are expired maybe without freeing the memory.

Cheers,

Henning

From: Ivan Ribakov via sr-users <[email protected]>
Sent: Dienstag, 10. März 2026 23:17
To: Kamailio (SER) - Users Mailing List <[email protected]>
Cc: Ivan Ribakov <[email protected]>
Subject: [SR-Users] topos_htable autoexpire not working

I have Kamailio 6.0.6. I'm using topos module with topos_htable storage backend. Since enabling topos+topos_htable in production I observed slow but steady shared memory consumption increase to the point where Kamailio ultimately runs out of shared memory.

In attempt to create an MRE, I have boiled down the config to the following module params:

modparam("topos", "storage", "htable")
modparam("topos", "branch_expire", 60)
modparam("topos", "dialog_expire", 60)
modparam("topos", "clean_interval", 60)
modparam("topos", "rr_update", 1)
modparam("topos", "methods_noinitial", "OPTIONS,NOTIFY")
modparam("topos", "contact_host", KAM_ROUTER_PRIVATE_IP)
modparam("topos_htable", "topos_htable_dialog", "topos_dialog=>size=14;autoexpire=60")
modparam("topos_htable", "topos_htable_transaction", "topos_transaction=>size=14;autoexpire=60")

My expectation is that this config will only store up to a minute of topos data, at which point htable autoexpiry will start freeing up shared memory.

I set up a SIPp test that throws a call at Kamilio that routes to non-existing destination and INVITE TX times out after 5sec and 408 is returned to the SIPp UAC. I'm generating 200 calls per second up to 1K concurrent calls.

Below are the prettified core.shmmem output for first 2 minutes with topos/topos_htable enabled:

| Timestamp   | Total     | Free     | Used     | Real_Used   | Max_Used   |   Fragments |
|:------------|:----------|:---------|:---------|:------------|:-----------|------------:|
| 21:12:25    | 100.00 MB | 94.71 MB | 5.29 MB  | 5.29 MB     | 5.29 MB    |           1 |
| 21:12:35    | 100.00 MB | 42.13 MB | 57.87 MB | 57.87 MB    | 57.87 MB   |           2 |
| 21:12:45    | 100.00 MB | 35.59 MB | 65.16 MB | 64.41 MB    | 65.16 MB   |          38 |
| 21:12:55    | 100.00 MB | 30.79 MB | 69.79 MB | 69.21 MB    | 69.79 MB   |          55 |
| 21:13:05    | 100.00 MB | 30.43 MB | 70.87 MB | 69.57 MB    | 70.87 MB   |          70 |
| 21:13:15    | 100.00 MB | 26.33 MB | 73.67 MB | 73.67 MB    | 73.67 MB   |           2 |
| 21:13:25    | 100.00 MB | 24.50 MB | 76.12 MB | 75.50 MB    | 76.12 MB   |         222 |
| 21:13:35    | 100.00 MB | 21.30 MB | 78.91 MB | 78.70 MB    | 78.91 MB   |         244 |
| 21:13:45    | 100.00 MB | 18.66 MB | 82.26 MB | 81.34 MB    | 82.26 MB   |         283 |
| 21:13:55    | 100.00 MB | 17.54 MB | 83.72 MB | 82.46 MB    | 83.72 MB   |         323 |
| 21:14:05    | 100.00 MB | 14.49 MB | 86.74 MB | 85.51 MB    | 86.74 MB   |         357 |
| 21:14:15    | 100.00 MB | 14.85 MB | 86.74 MB | 85.15 MB    | 86.74 MB   |         332 |
| 21:14:25    | 100.00 MB | 14.00 MB | 86.97 MB | 86.00 MB    | 86.97 MB   |         263 |

And here are the results for the same test with topos/topos_htable disabled:

| Timestamp   | Total     | Free     | Used     | Real_Used   | Max_Used   |   Fragments |
|:------------|:----------|:---------|:---------|:------------|:-----------|------------:|
| 21:16:00    | 100.00 MB | 94.62 MB | 5.38 MB  | 5.38 MB     | 5.38 MB    |           1 |
| 21:16:10    | 100.00 MB | 44.01 MB | 55.99 MB | 55.99 MB    | 55.99 MB   |           1 |
| 21:16:20    | 100.00 MB | 40.60 MB | 59.49 MB | 59.40 MB    | 59.49 MB   |           2 |
| 21:16:30    | 100.00 MB | 43.20 MB | 59.49 MB | 56.80 MB    | 59.49 MB   |           6 |
| 21:16:40    | 100.00 MB | 41.02 MB | 59.49 MB | 58.98 MB    | 59.49 MB   |           3 |
| 21:16:50    | 100.00 MB | 41.83 MB | 59.49 MB | 58.17 MB    | 59.49 MB   |           4 |
| 21:17:00    | 100.00 MB | 40.20 MB | 60.15 MB | 59.80 MB    | 60.15 MB   |           3 |
| 21:17:10    | 100.00 MB | 40.58 MB | 60.81 MB | 59.42 MB    | 60.81 MB   |          12 |
| 21:17:20    | 100.00 MB | 40.49 MB | 60.81 MB | 59.51 MB    | 60.81 MB   |          15 |
| 21:17:30    | 100.00 MB | 38.81 MB | 61.19 MB | 61.19 MB    | 61.19 MB   |           2 |
| 21:17:40    | 100.00 MB | 38.46 MB | 62.50 MB | 61.54 MB    | 62.50 MB   |           7 |
| 21:17:50    | 100.00 MB | 36.74 MB | 63.27 MB | 63.26 MB    | 63.27 MB   |           2 |
| 21:18:00    | 100.00 MB | 37.51 MB | 63.27 MB | 62.49 MB    | 63.27 MB   |           7 |

In both cases dlg.stats shows no more than 1K active dialogs. However shmmem does not appear to be freed up after 60sec with topos/topos_htable enabled.

Is my understanding of the "autoexpire" incorrect or is this a bug in topos/topos_htable?


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IVAN RIBAKOV
Lead Engineer
__________________________________________
CAIT, Campus Montegancedo,
Pozuelo de Alarcón 28223
Madrid - Spain
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