[Freeswitch-users] FreeSwitch - Performance issues

Nathan Neulinger nneul at mst.edu
Fri Aug 28 17:46:43 MSD 2015


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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