The `drop_requests` statistic is incremented when:
* the request is dropped by a pre-script callback (like B2B when there is no script execution for certain messages)
* the stateless `forward()` core function failed to send out something.

Regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
  https://www.opensips-solutions.com
  https://www.siphub.com

On 18.04.2024 17:19, Johan De Clercq wrote:
No I don't.
what I find strange is that MAX_RECV_BUFFER_SIZE 262144 is the default value of net.core.rmem_max and net.core.rmem_default.

Op do 18 apr 2024 om 16:02 schreef Ben Newlin <[email protected]>:

    Are you calling drop() anywhere in your script?

    https://www.opensips.org/Documentation/Script-CoreFunctions-3-4#toc13

    Ben Newlin

    *From: *Users <[email protected]> on behalf of
    Johan De Clercq <[email protected]>
    *Date: *Thursday, April 18, 2024 at 5:27 AM
    *To: *OpenSIPS users mailling list <[email protected]>
    *Subject: *Re: [OpenSIPS-Users] question on core statistics.

    * EXTERNAL EMAIL - Please use caution with links and attachments *

    ------------------------------------------------------------------------

    would it make sense to recompile with other flags ? And how do I
    set them  (I don't find these of menuconfig's compile options)?

    Currently it has MAX_RECV_BUFFER_SIZE 262144 and BUF_SIZE 65535.

    Can somebody explain also what both flags mean.

    Op do 18 apr 2024 om 11:07 schreef Johan De Clercq <[email protected]>:

        would it make sense to recompile with other flags ?

        Currently it has MAX_RECV_BUFFER_SIZE 262144 and BUF_SIZE 65535.

        Can somebody explain also what both flags mean.

        flags: STATS: On, DISABLE_NAGLE, USE_MCAST, SHM_MMAP,
        PKG_MALLOC, F_MALLOC, FAST_LOCK-ADAPTIVE_WAIT

        ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144,
        MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535

        poll method support: poll, epoll, sigio_rt, select.

        Op do 18 apr 2024 om 10:32 schreef Johan De Clercq
        <[email protected]>:

            Guys,

            I have an opensips instance running with 24 worker children.

            The worker load is very low.

            UDP queues are on 50 megs.

            when i query via the OS

            cat /proc/net/udp

            sl  local_address rem_address   st tx_queue rx_queue tr
            tm->when retrnsmt  uid  timeout inode ref pointer drops

            590: 03231D0A:13C4 00000000:0000 07 00000000:00000000
            00:00000000 00000000  0        0 413684019 2
            ffff880074820bc0 0

            591: 03231D0A:13C5 00000000:0000 07 00000000:00000000
            00:00000000 00000000  0        0 413766438 2
            ffff880465e4a440 0

            592: 03231D0A:13C6 00000000:0000 07 00000000:00000000
            00:00000000 00000000  0        0 412035865 2
            ffff8803e5a56b80 0

            934: 01231D0A:151C 00000000:0000 07 00000000:00000000
            00:00000000 00000000  0        0 26790 2 ffff88046c054840 0

            935: 0201FFEF:151D 00000000:0000 07 00000000:00000000
            00:00000000 00000000  0        0 26787 2 ffff88046c054bc0 0

            935: 01231D0A:151D 00000000:0000 07 00000000:00000000
            00:00000000 00000000  0        0 26791 2 ffff88046c0544c0 0

             1972: 00000000:D92A 00000000:0000 07 00000000:00000000
            00:00000000 00000000  0        0 15506 2 ffff88046dce5040 0

             5479: 00000000:E6DD 00000000:0000 07 00000000:00000000
            00:00000000 00000000  0        0 22811 2 ffff880465e4ab40 0

            12075: AA0914AC:00A1 00000000:0000 07 00000000:00000000
            00:00000000 00000000  0        0 20572 2 ffff88086d020800 0

            12075: 0100007F:00A1 00000000:0000 07 00000000:00000000
            00:00000000 00000000  0        0 20571 2 ffff88086d020b80 0

            13320: 00000000:857E 00000000:0000 07 00000000:00000000
            00:00000000 00000000  100        0 17515 2 ffff8800368ac780 0

            15661: 00000000:CEA3 00000000:0000 07 00000000:00000000
            00:00000000 00000000  0        0 15505 2 ffff8800368acb00 0

            => no drops

            what worries me is that there are drop requests and they 
            go up when I query via the mi interface

            opensipsctl fifo get_statistics drop_requests

            core:drop_requests:: 198107

            opensipsctl fifo get_statistics drop_requests

            core:drop_requests:: 199157

            opensipsctl_reg fifo get_statistics drop_requests

            core:drop_requests:: 204116

            I don't see any memory issue, also the processload is low.

            so 3 questions:

            - what exactly is drop_request.

            - do I need to worry about this

            - how can I make them go lower.

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