I understand the idea behind using cache facilities, however in this case, being a ST/SH attestation service, all calls need to be attested and the probability that multiple calls having src and dst numbers identical is, IMHO, very reduced.

So I don't see how a caching system could be used here, hence why HTTP is "a necessary evil".... unless i'm missing something here....

Atenciosamente / Kind Regards / Cordialement / Un saludo,

Sérgio Charrua

On Thu, Dec 19, 2024 at 11:19 PM Alexis Fidalgo via sr-users <sr-users@lists.kamailio.org> wrote:

To add some information if useful. In our case there are 2 main “actions” performed as processing when http service is called that takes a lot of time (there are more but are negligible against these 2)

1. A query to an Diameter DRA (which for external reasons or customer reasons) takes an average of 150ms (and in some other cities of the deploys can take more because of the delay in the links)
2. A query to a rest webservice that is in AWS, not that bad as point 1 but still bad (~70ms)

So, in the best of scenarios, we have ~225ms, maybe if the DRA load balances to another HSS we get ~180ms total call processing.

That is bad, really bad.

To probe the idea and before any major changes in any part, I started to keep DRA responses in a redis (we use dragonfly), it’s not consistent in terms of our call processing flow but my idea was to “remove” the delay of the diameter query (I run the query, keep the result in redis, when a new request arrives for the same value I use the cached value and send a new DRA query in other thread to avoid lock the current one and update the redis).

With this, we removed the DRA query wait, so 220ms became 70/72ms.

Instantly all cpu usage, all retransmissions, everything disappeared, cpu, mem went down drastically, etc etc.

That’s why I mentioned ’wait time is the enemy’, http is not (maybe is not your best friend but not the enemy). If it works, there’s an analogy, you can try to improve aerodynamics, engine and whatever in a F1 car, but if the driver is heavy …

Hope it helps


> On Dec 19, 2024, at 5:18 PM, Alex Balashov via sr-users <sr-users@lists.kamailio.org> wrote:
>
>
>> On Dec 19, 2024, at 1:06 pm, Calvin E. via sr-users <sr-users@lists.kamailio.org> wrote:
>>
>> Consider scaling out instead of scaling up. Now that you know the
>> apparent limit of a single node for your use case, put it behind a
>> Kamailio dispatcher.
>
> On the other hand, you might consider scaling up first, since HTTP performs so badly that there is lots of improvement to be squeezed out of optimising that even a little.
>
> You might think of scaling out as a form of premature optimisation. :-)
>
> -- Alex
>
> --
> Alex Balashov
> Principal Consultant
> Evariste Systems LLC
> Web: https://evaristesys.com
> Tel: +1-706-510-6800
>
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