[Asterisk-Users] IAX2 Vs SIP cpu load

[Mike Lynchfield]

taskset does not seem to exist on redhad 9 nor freebsd..

;)

On 6/13/06, Zoa <zoachien at securax.org> wrote:
>
>
>
> When i did this test ages ago, i found out that iax was worse than sip,
> but sip was worse than trunked iax.
>
> Joachim
>
> olin Anderson wrote:
> > I use IAX2 quite a bit and I haven't really noticed any difference
> between
> > IAX2 and SIP. CPU usage in Asterisk is aggravated by transcoding,
> changing
> > one audio format to another, and SIP or IAX2 is simply the protocol used
> to
> > carry the audio. Any function of Asterisk will be affected by high
> system
> > load; if you have a loadaverage of 3, for example, your box is in
> trouble
> > regardless of the protocol used.
> >
> > Although this may have changed in the newer 1.2.X series of Asterisk, I
> > believe that Asterisk does not support SMP from the perspective of
> > dispatching *internal* processes to different CPU's, instead, *external*
> > processes such as AGI's are balanced out and dispatched automatically to
> > different CPU's - but this is a kernel thing.
> >
> > It's generally well-known that a "fake" SMP machine such as a
> HyperThreading
> > CPU affects Asterisk negatively, and best practice is to disable
> > HyperThreading. However, "real" SMP machines have no trouble (I use a 4
> way
> > Xeon). It's possible to "pin" a process to a specific CPU, and in fact,
> I do
> > this to force Asterisk to it's own CPU, and pin all other processes to a
> > specific CPU that Asterisk does *not* use:
> >
> > setasteriskaffinity.sh:
> >
> > #!/bin/bash
> > ASTERISKPID=`ps -A | grep -a -A0 "asterisk"`
> > taskset 0x00000003 -p  ${ASTERISKPID:0:5}
> >
> > This "pins" Asterisk to CPU # 4 on a 4 way system. Repeat for all other
> > processes, to different CPU's with the affinity mask:
> >
> > 0x00000000 = CPU 1
> > 0x00000001 = CPU 2
> > 0x00000002 = CPU 3
> > 0x00000003 = CPU 4
> >
> >
> > -----Original Message-----
> > From: Jon Schøpzinsky [mailto:jos at detele.dk]
> > Sent: Tuesday, June 13, 2006 8:14 AM
> > To: Asterisk Users Mailing List - Non-Commercial Discussion
> > Subject: [Asterisk-Users] IAX2 Vs SIP cpu load
> >
> >
> > Hello
> >
> > Is it correct that IAX2 uses more CPU, than SIP? Also, can it be true
> that
> > IAX2 is much more sensitive against high CPU loads?
> > Also, does Asterisk support and use multiprocessor architectures, such
> as
> > Xeon?
> >
> >
> > Regards
> > Jon
> >
> >
> >
>
>
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-- 
Mike
Sales Manager
http://www.theclubvoip.com
Making it happen
1.888.470.7253
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