[Freeswitch-users] freeswitch CPU usage

[Nyamul Hassan]

Is this also the case for the recommended CentOS / RHEL?  Do you still have
to resort to having your own UDP implementation to max out Eth Card
limitation?

In the past, I have found a limitation on Linux, that the eth driver is
single-threaded.  So, I couldn't push beyond 50K pps on a Intel Quad E5504
HP machine through 1 ethernet card.

Regards
HASSAN


On Mon, Aug 23, 2010 at 09:34, Woody Dickson <woodydickson at gmail.com> wrote:

> Hi Vince,
>
> I have played with running Freeswitch on BSD too but the result is not
> great.  The reason seems to be because BSD's threading is not as
> efficient as the one in Linux or there may be some other ways to tune
> it.  BSD does give a better pure UDP throughput performance by the
> way.
>
> So what I ended up doing is developing my own UDP implementation which
> enable media to move through the ethernet at raw wire speed.  I am
> able to max out the ethernet card limitation on Linux platform as a
> result of that.
>
> Woody
>
>
> On Mon, Aug 23, 2010 at 1:53 AM, Vincent Stemen
> <vince.freeswitch at hightek.org> wrote:
> > On Fri, Aug 20, 2010 at 05:29:31PM +0800, Woody Dickson wrote:
> >> Hi,
> >>
> >> I am doing some experiments with Freeswitch by torturing it to see how
> >> the machine's CPU response to heavy loaded situation.
> >> The test is done on a 16 core 5550 dual quad core server running
> >> fedora 2.6.30.10-105.2.23.fc11.x86_64 OS.
> >>
> >> What I found so strange was that while CPU usage remains pretty low
> >> and distributed among all cores at 190 - 200 calls per second.  Then,
> >> after added a few more calls per second, all CPU becomes fully
> >> utilized.
> >>
> >> Is this due to some wrong setting?  Any idea how I can tweak the
> >> configuration and continue my test?
> >>
> >> Thanks,
> >> Woody
> >
> > Hi Woody.
> >
> > I would hazard to guess that this could be a Linux resource management
> > issue.  I don't have any experience with SMP on Linux, but Linux has
> > a long history of memory management (among other) problems.  We ran
> > Linux exclusively on all our servers and workstations for over 10 years
> > before finally switching to BSD several years ago.  We had continuous
> > problems ranging from minor strange unexplained behaviours, as you
> > describe, to what appeared to be bugs in applications, to outright
> > crashes and freezes of the whole OS every day.  When we switched to BSD
> > nearly all the problems went away.  Even some of the (what appeared to
> > be) bugs in Linux binary applications went way, going from Linux to BSD
> > running under Linux emulation (without re-compiling), using the same
> > Linux libraries on the same hardware.
> >
> > An interesting test would be to try the same load test with BSD on the
> > same machine and see if you get a similar result.
> >
> > Regards,
> > Vince
> >
> >
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