Could you try running this test?
https://txlab.wordpress.com/2015/04/10/testing-freeswitch-performance-on-scaleway-c1/

On Jun 15, 2015 9:33 PM, "Oleg Stolyar" <olegstolyar@gmail.com> wrote:
Hi guys,

I am using the master version from  couple of months ago.  I started running it on an 8 CPU AWS instance on Ubuntu 14.

It seems that FS is only using the first 4 CPUs.  The load on the other 4 is consistently much lower and we started getting voice quality issues at about the same number of concurrent calls as a 4 CPU instance.

Is this  a known issue or am I imagining things?

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