[EXTERNAL] Re: Performance issues

Tue Oct 4 13:45:17 UTC 2022

Remember that the query may take <1s but the time for the query response at the client can be >5s. Its often because there is a queue built up of requests and the DB is too slow to service them thus the ‘enqueued’ ones are around for too long. Fixing is mostly make the DB faster eg by adding another server and synchronising the data, fixing indexes, ensuring queries aren’t idiotic (eg full table scans). Sometimes it’s the network eg TLS using a dumb slow random number source that’s not getting enough entropy so blocking or perhaps might be packet loss, etc etc etc.

Sadly, this is all about analysing the system bit by bit until you find the real issue and fixing that.. For your sanity start at the bottom of the stack and work up. FreeRadius is highly unlikely to be the problem. It comfortably handles 30K requests per second and without much effort can do much more.

From: Freeradius-Users <freeradius-users-bounces+alister.winfield=sky.uk at lists.freeradius.org> on behalf of Alan DeKok <aland at deployingradius.com>
Date: Tuesday, 4 October 2022 at 14:31
To: FreeRadius users mailing list <freeradius-users at lists.freeradius.org>
Subject: [EXTERNAL] Re: Performance issues
On Oct 4, 2022, at 8:45 AM, Imdad Hasan <imdadalikadiwala0 at gmail.com> wrote:
> I am checking the slow query logs from the last 3 days and still it's not
> any slow query logs more than 2 secs from FreeRADIUS queries.
>
> Please suggest what I should do. I checked all the things.

  I really can't explain things any more than I already have.

  FreeRADIUS doesn't lie about "SQL module is blocked".  That means that FreeRADIUS calls SQL, and SQL does not respond for 5 seconds.

  Whether it's SQL or the network, it doesn't matter.  In extreme cases, it could be some other process on the same system consuming 100% CPU for 5 seconds, and "starving" FreeRADIUS.

  But what is absolutely true is that this is not a FreeRADIUS issue.  No amount of poking FreeRADIUS will solve the problem.

  The problem is somewhere in your local network.  We cannot help you with that.

  Alan DeKok.

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