[Freeswitch-users] FreeSwitch - Performance issues
Shaun Stokes
shaun.stokes at itec-support.co.uk
Fri Aug 28 18:37:45 MSD 2015
Hi Nathan,
Thanks for the suggestion, we still see the CPU spikes when is under load after reducing to 8 cores but I think there may actually be an improvement in the audio quality.
It's still not what we're expecting, so we will have to test our build on physical hardware too.
Thanks,
Shaun
-----Original Message-----
From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Nathan Neulinger
Sent: 28 August 2015 15:04
To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>
Subject: Re: [Freeswitch-users] FreeSwitch - Performance issues
Yes, I know you said Hyper-V, I don't know if it has the same sort of scheduler behavior or not, just mentioned the vmware for context.
On 08/28/2015 08:46 AM, Nathan Neulinger wrote:
> One thing that I see jump out - you've probably got too many virtual
> cores defined on that VM, particularly since you've assigned # vcpu the same as the number of real cores on the host system.
>
> Try your test again dropping that to 8 virtual CPUs and I think you
> might see better results. (Or at least drop to less than 100% of the
> total cores on the hardware.)
>
> Particularly if this host system has other vms running on it, you're
> hurting the vm scheduler's ability to hand out resources. With vmware,
> I believe a simple rule of thumb is that scheduler requires N-1 CPUs
> to be locked to schedule execution of an N cpu virtual machine - so even if it doesn't need all of the CPUs, it has to reserve all of them any time you have more than a 2 vCPU vm.
>
> -- Nathan
>
> On 08/28/2015 08:18 AM, Michael Jerris wrote:
>> The numbers your posting are fairly low, I'm guessing this is a
>> grossly underpowered vm that is causing your issues
>>
>> On Friday, August 28, 2015, Shaun Stokes <shaun.stokes at itec-support.co.uk <mailto:shaun.stokes at itec-support.co.uk>> wrote:
>>
>> Hi Peter,____
>>
>> __ __
>>
>> Thanks for the advice, this is something we're already looking into but we don't have the new hardware available
>> yet.____
>>
>> __ __
>>
>> Debian 8 has great integration with Hyper-V on 2012R2 and operates as a Generation 2 VM, obviously it's never going
>> to be as good as running directly on the hardware but we were
>> hoping for better performance.____
>>
>> __ __
>>
>> Thanks,____
>>
>> Shaun____
>>
>> __ __
>>
>> *From:*freeswitch-users-bounces at lists.freeswitch.org
>> <javascript:_e(%7B%7D,'cvml','freeswitch-users-bounces at lists.freeswitch.org');>
>> [mailto:freeswitch-users-bounces at lists.freeswitch.org
>> <javascript:_e(%7B%7D,'cvml','freeswitch-users-bounces at lists.freeswitch.org');>] *On Behalf Of *Peter Olsson
>> *Sent:* 28 August 2015 10:43
>> *To:* FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org
>> <javascript:_e(%7B%7D,'cvml','freeswitch-users at lists.freeswitch.org');>>
>> *Subject:* Re: [Freeswitch-users] FreeSwitch - Performance
>> issues____
>>
>> __ __
>>
>> If you want high performance, I recommend using real hardware, not a virtual machine setup - it will cause you
>> issues.____
>>
>> __ __
>>
>> /Peter____
>>
>> __ __
>>
>> 2015-08-28 9:44 GMT+02:00 Shaun Stokes <shaun.stokes at itec-support.co.uk
>>
>> <javascript:_e(%7B%7D,'cvml','shaun.stokes at itec-support.co.uk');>>:__
>> __
>>
>> Hi Michael,____
>>
>> ____
>>
>> Thanks for the response and recommendation.____
>>
>> ____
>>
>> Our new build is now on Debian 8 Jessie, performance on the system is noticeably better and any audio problems
>> while the system is under load are significantly reduced but we do still experience spikes along with reduced
>> audio quality when the system is processing 20 calls per
>> second while already maintaining 80 existing calls.____
>>
>> ____
>>
>> We're still hitting some kind of bottleneck, what should we expect to be able to support on a single piece of
>> hardware? We've kept our dialplans as small as possible and we're using Memcache, but something tells me it's
>> the call setup process which is triggering the spikes, is this possibly a limitation on the SIP profiles which
>> are single threaded?____
>>
>> ____
>>
>> I also see FreeSWITCH supports clustering but it's in relation to high availability, is it possible to cluster a
>> single FreeSWITCH instance across multiple hardware or should we be looking elsewhere to solve these
>> bottlenecks?____
>>
>> ____
>>
>> We switched to TCP Vegas on our new build as recommended on the FreeSWITCH Wiki, this has provided a noticeable
>> reduction in audio latency but doesn't solve the issue with
>> CPU spikes.____
>>
>> ____
>>
>> Many Thanks,____
>>
>> Shaun____
>>
>> ____
>>
>> *From:*freeswitch-users-bounces at lists.freeswitch.org
>> <javascript:_e(%7B%7D,'cvml','freeswitch-users-bounces at lists.freeswitch.org');>
>> [mailto:freeswitch-users-bounces at lists.freeswitch.org
>> <javascript:_e(%7B%7D,'cvml','freeswitch-users-bounces at lists.freeswitch.org');>] *On Behalf Of *Michael Jerris
>> *Sent:* 15 August 2015 23:00
>> *To:* FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org
>> <javascript:_e(%7B%7D,'cvml','freeswitch-users at lists.freeswitch.org');>>
>> *Subject:* Re: [Freeswitch-users] FreeSwitch - Performance
>> issues____
>>
>> ____
>>
>> There are multiple known issues with Ubuntu 12.04. We reccomend Debian 8 Jessie.
>>
>> On Friday, August 14, 2015, Shaun Stokes <shaun.stokes at itec-support.co.uk
>>
>> <javascript:_e(%7B%7D,'cvml','shaun.stokes at itec-support.co.uk');>>
>> wrote:____
>>
>> Hi,____
>>
>> ____
>>
>> We're experiencing performance issues with FreeSwitch, our target is 500 concurrent sessions, but at the
>> moment this starts to bottleneck around 30.____
>>
>> ____
>>
>> Host system:____
>>
>> Windows Server 2012 Hyper-V Host____
>>
>> AMD Opteron 4386 (2 processors) - 16 cores total____
>>
>> 128GB DDR3____
>>
>> 2TB RAID 5 (700MB/s tested read and write
>> throughput)____
>>
>> ____
>>
>> FreeSwitch Virtual Machine:____
>>
>> FreeSwitch 1.4.15____
>>
>> Ubuntu 12.04 LTS____
>>
>> 16 Virtual cores (high priority)____
>>
>> 2GB RAM (would assign more but FreeSwitch never seems to
>> use much)____
>>
>> 500GB HD (on VHDX)____
>>
>> ____
>>
>> After around 30 concurrent sessions we begin to see CPU spikes almost every time a new call comes in, as the
>> sessions increase the size and frequency of the CPU spikes also increase. The system seems to be able to sit
>> comfortably with over 100 concurrent sessions and 80% idle CPU, providing we don't have any new calls
>> hitting the platform. The spikes are causing audio (RTP) to stutter or in some cases drop completely for a
>> few seconds.____
>>
>> ____
>>
>> The FreeSwitch spikes are occurring on all 16 cores, we have been monitoring the system using htop and
>> mpstat.____
>>
>> ____
>>
>> This is an example of when we receive an inbound call
>> while we have 34 concurrent sessions:____
>>
>> 14:26:04 CPU %usr %nice %sys %iowait %irq %soft %steal %guest %idle____
>>
>> 14:26:05 all 1.67 0.00 27.34 0.00 0.25 0.00 0.00 0.00 70.74____
>>
>> 14:26:05 0 1.00 0.00 28.00 0.00 0.00 0.00 0.00 0.00 71.00____
>>
>> 14:26:05 1 0.99 0.00 26.73 0.00 0.00 0.00 0.00 0.00 72.28____
>>
>> 14:26:05 2 0.99 0.00 26.73 0.00 0.00 0.00 0.00 0.00 72.28____
>>
>> 14:26:05 3 3.92 0.00 26.47 0.00 0.00 0.00 0.00 0.00 69.61____
>>
>> 14:26:05 4 0.99 0.00 25.74 0.00 1.98 0.00 0.00 0.00 71.29____
>>
>> 14:26:05 5 0.99 0.00 26.73 0.00 0.99 0.00 0.00 0.00 71.29____
>>
>> 14:26:05 6 0.00 0.00 26.47 0.00 0.98 0.00 0.00 0.00 72.55____
>>
>> 14:26:05 7 0.00 0.00 26.73 0.00 0.00 0.00 0.00 0.00 73.27____
>>
>> 14:26:05 8 3.96 0.00 27.72 0.00 0.00 0.00 0.00 0.00 68.32____
>>
>> 14:26:05 9 2.00 0.00 27.00 0.00 0.00 0.00 0.00 0.00 71.00____
>>
>> 14:26:05 10 6.00 0.00 32.00 0.00 0.00 0.00 0.00 0.00 62.00____
>>
>> 14:26:05 11 1.96 0.00 27.45 0.00 0.00 0.00 0.00 0.00 70.59____
>>
>> 14:26:05 12 0.99 0.00 26.73 0.00 0.00 0.00 0.00 0.00 72.28____
>>
>> 14:26:05 13 1.00 0.00 28.00 0.00 0.00 0.00 0.00 0.00 71.00____
>>
>> 14:26:05 14 0.00 0.00 27.00 0.00 0.00 0.00 0.00 0.00 73.00____
>>
>> ____
>>
>> This is when the system is not receiving an inbound call but is sitting comfortably at 34 concurrent
>> sessions:____
>>
>> 14:25:57 CPU %usr %nice %sys %iowait %irq %soft %steal %guest %idle____
>>
>> 14:25:58 all 0.87 0.00 0.62 0.00 0.12 0.00 0.00 0.00 98.39____
>>
>> 14:25:58 0 0.99 0.00 0.99 0.00 0.00 0.00 0.00 0.00 98.02____
>>
>> 14:25:58 1 0.99 0.00 0.99 0.00 0.00 0.00 0.00 0.00 98.02____
>>
>> 14:25:58 2 0.98 0.00 0.98 0.00 0.00 0.00 0.00 0.00 98.04____
>>
>> 14:25:58 3 0.00 0.00 0.99 0.00 0.00 0.00 0.00 0.00 99.01____
>>
>> 14:25:58 4 0.00 0.00 0.00 0.00 1.98 0.00 0.00 0.00 98.02____
>>
>> 14:25:58 5 0.00 0.00 0.00 0.00 0.99 0.00 0.00 0.00 99.01____
>>
>> 14:25:58 6 0.00 0.00 0.99 0.00 0.00 0.00 0.00 0.00 99.01____
>>
>> 14:25:58 7 0.00 0.00 0.99 0.00 0.00 0.00 0.00 0.00 99.01____
>>
>> 14:25:58 8 5.00 0.00 1.00 0.00 0.00 0.00 0.00 0.00 94.00____
>>
>> 14:25:58 9 1.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 99.00____
>>
>> 14:25:58 10 1.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 99.00____
>>
>> 14:25:58 11 0.99 0.00 0.99 0.00 0.00 0.00 0.00 0.00 98.02____
>>
>> 14:25:58 12 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00____
>>
>> 14:25:58 13 1.98 0.00 0.99 0.00 0.00 0.00 0.00 0.00 97.03____
>>
>> 14:25:58 14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00____
>>
>> 14:25:58 15 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00____
>>
>> ____
>>
>> We're using FreeSwitch in multi-tenant mode, we have tried dedicating a single VM for one tenancy but still
>> experience the issue. My assumption has been that this will be due to the dialplan, I've optimized this
>> slightly by writing LUA scripts to handle some of the inbound calls this appears to take away some of the
>> load but we're still using the internal dialplans for each tenancy (tenancy dialplans have an average of 300
>> entries).____
>>
>> ____
>>
>> We are using the following arguments when running
>> FreeSwitch:____
>>
>> -rp -nc -nonat____
>>
>> ____
>>
>> I've seen another post which says we should operate FreeSwitch in High Performance mode using -hp but can't
>> find anything information about this, is this still a
>> valid argument to use with FreeSwitch?____
>>
>> ____
>>
>> Has anyone experienced similar performance issues before
>> or have any advice?____
>>
>> ____
>>
>> Hope someone may be able help.____
>>
>> ____
>>
>> Thanks,____
>>
>> Shaun____
>>
>>
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>
--
------------------------------------------------------------
Nathan Neulinger nneul at mst.edu
Missouri S&T Information Technology (573) 612-1412
System Administrator - Architect
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