Just a theory but it could be related to what other guests are running on the EC2 host. VoIP and virtual machines don't generally go together very well.

On 15 June 2015 at 20:32, 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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