[Freeswitch-users] freeswitch CPU usage

Mon Aug 23 09:24:03 PDT 2010

It's Always this type of thread that gets attention an not others that
actually need attention.

I may not have been cute and cuddly in my reply to Woody but I gave
him a series of load testing aids in that same reply.
And I don't notice Woody complaining.  If you are offended Woody,
accept my regrets.  You have indeed hit a sore note because this
subject always creates a huge pain for us and I don't always have time
for tact in my busy day.  Did you receive the numerous tips I
suggested in my replies? I'll restate the most important which is
probably to use the -heavy-timer command line arg to FS on a box like
yours.  (This was default in 1.0.4) I believe most of what I said is
already on our WIKI but if not it would be a good idea to get it in
there.

READERS:

Please strike "at our expense" from my original reply and replace it
with "with the help of our absolutely free software" as some of the
finer nuances in our irregular english language especially idioms may
be lost in translation for some individuals.

To the rest of you who have stepped up to make a non-biased
performance WIKI page, Thank you for your efforts perhaps that will
save us all some time in the long run.

On Mon, Aug 23, 2010 at 10:34 AM, David Ponzone <david.ponzone at ipeva.fr> wrote:
> Thank you guys, but I should have said that I am perfectly aware of the pps
> vs. bps limitations.
> I had several years of experience dealing with Cisco 7200/7500 to learn
> about how one vendor can lie about performances :)
> I was just asking this to be sure about the figures.
> 70k pps mean around 1400 concurrent calls if ptime is 20ms (I am assuming
> 70k pps means 70k for both ways. If it's 70k pps with input/output
> aggregated, all the following figures have to be divided by 2).
> I heard that some people around get 3000 calls on one box.
> So they get those 3000 calls probably spreading the load among multiple gigE
> cards.
> It's an important information to have for people building quite large
> switches that one gigE card won't handle more than 1000 calls with a regular
> kernel.
> Perhaps even 800 if you want to stay on the safe side.
> David Ponzone  Direction Technique
> email: david.ponzone at ipeva.fr
> tel:      01 74 03 18 97
> gsm:   06 66 98 76 34
> Service Client IPeva
> tel:      0811 46 26 26
> www.ipeva.fr  -   www.ipeva-studio.com
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>
>
> Le 23/08/2010 à 17:17, Brian West a écrit :
>
> I think you explained it a bit more in detail... we are saying exactly the
> same thing just I'm a bit more brief.
>
> /b
>
> On Aug 23, 2010, at 9:47 AM, Nyamul Hassan wrote:
>
> David,
>
> In our experience, it is not about "bps", but about "pps".  Because the
> ethernet driver in Linux is single threaded, you cannot push beyond what a
> single core can handle.
>
> In our case, after 60kpps (on Intel X5504), the quality deteriorated.  In
> Woody's case, this limit goes as high as 70kpps (on Intel X5550), which is
> roughly equivalent to the single core clock speed difference between the
> servers.
>
> Brian is speaking the exact same jargon, that I came across when I was
> reading about this 1 year ago.
>
> Regards
>
> HASSAN
>
>
>
> 2010/8/23 Brian West <brian at freeswitch.org>
>
> Chances are you're not hitting the bandwidth limits but the fact that you're
> moving tiny packets around.  Smaller packets == more context switches ==
> less throughput.  You can increase your packet size to 60ms and gain
> performance.
>
> /b
>
>
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-- 
Anthony Minessale II

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