19 Dec
2024
19 Dec
'24
2:51 p.m.
Hello,
according to this discussion:
https://kamailio.org/mailman3/hyperkitty/list/sr-users@lists.kamailio.org/t…
and the linked PR in it, HTTP/2 should be available. Its probably something to tested, as
certain features (e.g. HTTP/2 multiplexing) are deactivated in the http_async_client for
example.
Cheers,
Henning
--
Henning Westerholt – https://skalatan.de/blog/
Kamailio services – https://gilawa.com
-----Original Message-----
From: Alex Balashov via sr-users <sr-users(a)lists.kamailio.org>
Sent: Donnerstag, 19. Dezember 2024 20:16
To: sr-users(a)lists.kamailio.org
Cc: Alex Balashov <abalashov(a)evaristesys.com>
Subject: [SR-Users] Re: Kamailio not receiving packets on high CPS
BTW: Not sure what the state of HTTP/2 support is in http_async_client.
If existent, and the server is HTTP/2, you can make multiple sequential and
parallel requests over the same connection. Given Kamailio's concurrency and
isolation model, this would probably mean sequential requests over multiple
persistent connections attached to each process.
While HTTP backends are still characteristically sluggish from the perspective of
the tight timing tolerances of traditional real-time communications, this would
be a real game-changer and probably vacate much of what I'm saying, and the
basis of my opposition to HTTP as an integration path out of Kamailio.
HTTP/1.1 is for these kinds of systems, though. If high throughput is your
goal, I'd go a different route. Whatever you do to squeeze a few hundred
requests/sec out of it will most likely amount to a Pyrrhic victory.
-- Alex
On Dec 19, 2024, at 2:06 pm, Alex Balashov
<abalashov(a)evaristesys.com>
wrote:
> On Dec 19, 2024, at 1:54 pm, Ben Kaufman <bkaufman(a)bcmone.com>
wrote:
>
> Alex,
>
> I read the OP's requirements like this. They want to implement a redirect
server that will:
> • Receive a SIP INVITE
> • Make a single http request that has a RTT of 200ms
> • Copy a header from the HTTP reply to a SIP 300 reply
> • Handle the ACK for the reply
>
> Is it your opinion this cannot be implemented reliably with Kamailio on a
4vCPUs and 4GB RAM host at a rate of 750 INVITE requests per second?
I have no idea. That's an empirical question. In my experience, that's an
ambitious ask given the stochastic variation in HTTP API response time (i.e.
it's
not exactly and literally 200 ms), but it's probably possible with enough
processes.
My only argument--from first principles-- is that you'll get a lot more
throughput if you ditch HTTP, and I joined the conversation at the point at
which Alexis Fidalgo expressed that async isn't a cure-all. I wanted to sign onto
this sentiment.
-- Alex
--
Alex Balashov
Principal Consultant
Evariste Systems LLC
Web: https://evaristesys.com
Tel: +1-706-510-6800
--
Alex Balashov
Principal Consultant
Evariste Systems LLC
Web: https://evaristesys.com
Tel: +1-706-510-6800
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