[asterisk-users] Performance Issues Degradation After 6 Calls

[Gordon Henderson]

On Fri, 28 Dec 2007, Steve Totaro wrote:

> Gordon Henderson wrote:
>> On Fri, 28 Dec 2007, Steve Totaro wrote:
>>
>>
>>> broadband Voice wrote:
>>>
>>>> On 12/27/07, *broadband Voice* <broadbandvoice at gmail.com
>>>> <mailto:broadbandvoice at gmail.com>> wrote:
>>>>
>>>>     I am using Asterisk and A2billing Calling Card Platform and after
>>>>     the 6th call the quality starts to degrade. The way it set up is
>>>>     the user calls into the system then dial out so I have 12 channels
>>>>     being used up but 6 active calls. Here are my specs Asterisk
>>>>     SVN-branch-1.4-r79142 on a i686 running Linux Fedora 6, Pentium 4
>>>>     Hyper-Threading, 64 bit, 1GB of RAM, 80 GB Sata Drive, bandwidth 4
>>>>     Mbps (1300GB/Throughput) burstable to 100Mbps.
>>>>
>>>>     I am planning on upgrading to Intel Core 2 Duo with a clock speed
>>>>     of 1.8GHZ and 2GB Ram. Does anyone have similar situation or
>>>>     advice? Thanks.
>>>>
>>>>
>>>>
>>> Your system should be able to handle that volume easily.
>>>
>>> What are you using for PSTN connectivity?
>>>
>>> I have heard of people having issues with Hyperthreading.  That could be
>>> a problem, although I have never had any issues myself.
>>>
>>> What does top look like?
>>>
>>> When I had a similar issue (voice quality while running monitor on over
>>> seventy calls) I found a small Linux CLI app, I cannot remember the name
>>> of it but it would give IO stats (I think it may be named IOStat or
>>> something similar) and I could see right where the bottleneck was
>>> (obviously disc IO but I was able to see exactly where the breaking
>>> point was).  That may help identify something.
>>>
>>
>> Try:
>>
>>    vmstat 1
>>
>> IIRC, iostat is a *BSD type utility, but it's been many years since I
>> touched BSD!
>>
>> It is possible to graph disk IO as well as network packet IO if required
>> using (eg) MRTG.
>>
>> Gordon
>>
>>
>
> http://www.linuxquestions.org/linux/articles/Jeremys_Magazine_Articles/Hunting_I_O_Bottlenecks_with_iostat

Ah, intersting, so I was about to suggest it might be a distro thing, but 
digging deeper, I find there is an iostat for Debian - under the generic 
package "sysstat" which is why I've never found it in the past.

The iostat I remember for BSD had a screen/curses interface, but scrolling 
might help you see trends.

Cheers,

Gordon