[Freeswitch-users] High CPU usage and Slow BLFs with only 8 channels?

Sun Sep 26 20:25:57 UTC 2021

just keep in mind registration and blf subs etc count as CPS (sip calls/sec) why not offload that stuff to opensips?

Sent from my iPhone

> On Sep 26, 2021, at 09:18, Jerry Kendall <Jerry.Kendall at bishophosting.com> wrote:
> 
> 
> Hello all,
> 
> I'm having some interesting problems with our Freeswitch system.
> 
> I have found Tim's posting at https://lists.freeswitch.org/pipermail/freeswitch-users/2012-February/080422.html
> 
> It seems very similar but does not help me... Wish it did.
> 
> 
> Hardware: Dell R610, dual 6 core Xeon X5680 @ 3.3GHz with 10 Gig of RAM
> Network: Dual 10Gig Fiber to 40Gig fabric
> 
> Databases: also Dell R610 with dual 10Gig and Mariadb 10.5.9 NO ISSUES - VERY FAST - ULTRA LOW LATENCY
> 
> 
> 
> We have 2 different FS systems
> 1) One acting as an SBC of sorts - process SIP/RTP
> 2) One acting as a PBX - process SIP/RTP
> 
> Providers are connected to SBC (public - context)
> PBX (sbc - context) connects to SBC (internal - context)
> End Points connect to PBX (device - context)
> 
> picographically:
> 
> ITSP --- SBC --- PBX --- EndPoints
> 
> The machine running FreeSWITCH as an SBC is fine - 50 calls (100 sessions) and near zero load average - CPU idle 98% - ALL GREAT
> 
> About 100 devices registered, all NAT'd, approx 50 subscription via BLF buttons
> Registration period is maxed to 60 minutes and most devices use the default of 60 minutes
> 
> Typically, We see only a few CPS, maybe 5 if it's really busy
> 
> All our trunks are SIP.  Only using PCMU/8000 codec.
> 
> We use MARIADB in the core - as well as for sofia, voicemail, and anything else that can use it.
> 
> Config, Directory and dialplan are done using CURL and handled via apache2 on the same server over 127.0.0.1.
> 
> I keep hearing about FS systems handling thousands of users on one box.  
> I'm nowhere near that and it seems to be maxed out.
> 
> Freeswitch on both systems is Version 1.10.6-release git 1ff9d0a 2021-03-25 13:16:09Z 64bit
> 
> So... The problem
> 
> The machine running FreeSWITCH as a PBX seems to be struggling during periods of any usage - even only 1 call (2 channels). 
> 
> Just a moment ago, load average is 4.5 - CPU Idle is 65% - 8 sessions active - 315 sessions since startup - 45 threads - 8 hours running
> 
> The audio seems fine - no complaints reported..
> There is a very noticable chocking on the BLFs though... Every few minutes, the BLFs just freeze - yes - freeze... Then they catch up
> 
> for example, for testing this, I have programmed a BLF on one phone.
> 
> I run manually "luarun /etc/freeswitch/scripts/on.lua  *8896 at domain.com" - the lights turns red
> then after a few seconds, 
> I run manually "luarun /etc/freeswitch/scripts/off.lua  *8896 at domain.com" - the light turns green
> Sometimes, when I run these manually, the lights take 30 seconds to change - sometimes - usually, under a second.
> 
> 
> They change the state of the subscribe target
> Here is the LUA script to turn the light ON(RED)
> 
> ##############################################################
> #!/lua
> 
> local random = math.random
> math.randomseed(os.time())
> 
> local function uuid()
>     local template ='xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'
>     return string.gsub(template, '[xy]', function (c)
>         local v = (c == 'x') and random(0, 0xf) or random(8, 0xb)
>         return string.format('%x', v)
>     end)
> end
> 
> local function SendCallDirectorBLFevent()
> 
>         Uuid = uuid()
> 
>         local event = freeswitch.Event("PRESENCE_IN")
>         event:addHeader("proto", "sip")
>         event:addHeader("event_type", "presence")
>         event:addHeader("alt_event_type", "dialog")
>         event:addHeader("Presence-Call-Direction", "outbound")
>         event:addHeader("from", argv[1])
>         event:addHeader("login", argv[1])
>         event:addHeader("unique-id", Uuid )
>         event:addHeader("answer-state", "confirmed")
>         event:fire();
> end
> 
> SendCallDirectorBLFevent()
> ##############################################################
> 
> The issue is the choking on the BLFs and the HIGH load avg for such small amounts of calls on the PBX - the SBC seems fine.
> 
> SO.....
> 
> I have been trying to resolve this for about a month - looking everywhere I could.
> I have monitored the network stats, disk IO stats, cpu usage, processes, etc.... I don't see anything different between the SBC and PBX stats...
> 
> 
> I would like the BLFs to show the correct state a little faster (more like half a second, not 10-60 seconds after the event) and would I like to know how to fix the high CPU load on the PBX.
> 
> I have confirmed 2 things today:
> 1) it's not using mod_mariadb as I put back the ODBC and not help
> 2) this is seems most noticeable when new calls come in. The BLFs pause to 5-8 seconds and continue - there is a noticeable spike in load avg when calls keep coming in for 5 minutes...
> 
> 
> Any information that would be helpful?
> 
> 
> Thanks,
> Jerry
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