Have you done the math for the network connections? BTF and external
What bit rates for the sound?
What codecs?
How are calls coming in - SIP - analogue
Disks OK(low IO per second)? Caching working OK?
CPU may not be the problem if your CPU utilization is really that low.
Ron
On 02/03/2015 10:26 AM, Mordechay Kaganer wrote:
B.H.
Hello, all :-)
We have a cluster of Asterisk (v. 11.9) servers that host IVR
applications. The servers work behind SIP proxy (kamailio) for load
balancing.
All servers are in 2 processor configuration, 8-10 cores per CPU.
When a particular server gets about 500 concurrent calls, the sound
quality begins to degrade, the sound plays slowly and with clicks. As
far as i understand, it's because asterisk is unable to send the voice
stream in time i.e. the server is overloaded.
What i don't understand is, at the time that the server appears to be
overloaded and the audio quality is bad, actual server's load is no
more than 30-40% (60-70% idle CPU on average). IMHO, this indicates
that for some reason the server is unable to use it's CPU capacity
efficiently. May be because of some kind of thread contention inside
asterisk?
I have read blogs that advice to divide physical server into several
VMs and they claim that this will improve the total capacity. In my
own experience, this did not work very well and seems like the
visualization actually made the quality worse.
Do you have any advice for me (other than purchasing more servers ;-) ?
Thanks!
--
משיח NOW!
Moshiach is coming very soon, prepare yourself!
יחי אדוננו מורינו ורבינו מלך המשיח לעולם ועד!
--
Ron Wheeler
President
Artifact Software Inc
email: rwhee...@artifact-software.com
skype: ronaldmwheeler
phone: 866-970-2435, ext 102
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