[asterisk-users] DAHDI wct4xxp high system CPU on idle?

[Gareth Blades]

On 14/08/13 18:48, Tony Mountifield wrote:
> I have a system running CentOS 5.9 and DAHDI 2.6.2 with a 2-port E1 card
> using the wct4xxp driver (also using Asterisk 11.5.0, but that isn't
> relevant to the question).
>
> With DAHDI and Asterisk started, the system appears to run normally, as
> far as I can tell from limited testing.
>
> I am monitoring User, System and Nice CPU usage using SNMP and MRTG, and I
> have noticed that when I have started up DAHDI, the System CPU jumps up to
> around 12% or so and stays there. It does this even if I don't start
> Asterisk.
>
> On previous systems I have built over the years, using CentOS4 and Zaptel,
> I don't recall seeing such high CPU usage just from having Zaptel started.
> It would be down near 0% until the system started handling real calls.
>
> So my first question would be: is this high CPU usage normal with current
> cards and DAHDI? It's curious that 12.5% is 1/8 of 100% and /proc/cpuinfo
> reports 8 CPUs, but I don't know whether that is just coincidence. The CPU
> is a X3450 with four cores and HT enabled.
>
> Any thoughts would be gratefully received!
>
> Cheers
>
> Tony
One of our servers does that but only on one particular server. There is 
nothing special with the server as apart from being a different model 
Dell 1u due to being bought at different times its identical. It only 
has the one pcie expansion. We see the events/1 process taking 10% of 
system cpu. We use sangoma cards and this issue has persisted as we have 
upgraded from 1.4 to 1.6 and then 1.8 with Dahdi being upgraded at the 
same time.