[Asterisk-Users] CPU spikes with wcfxs loaded

[Craig Guy]

If you are using an Athlon then you might have a VIA chipset and apparently
non-intel chipsets can have these sorts of interrupt problems (Via
especially).  Try changing to an intel chipset motherboard.

Craig

----- Original Message ----- 
From: "Michael Welter" <mike at introspect.com>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<asterisk-users at lists.digium.com>; <support at digium.com>
Sent: Tuesday, December 14, 2004 5:57 AM
Subject: [Asterisk-Users] CPU spikes with wcfxs loaded


> I need to reopen this discussion because it's impossible to run spandsp
> (and VoIP) under these circumstances.
>
> With zaptel unloaded, I see the following "vmstat 1" output:
>
> no swapping, an occasional disk output, +/- 1003 interrupts/sec., less
> than 10 context switches/sec., CPU idle 100%.  A very quiet system.
>
> I load modules zaptel and wcfxo, and the system utilization stays the
> same.  When I load wcfxs, the number of interrupts goes up to +-2004,
> which is normal.  However, every three seconds the CPU spikes to 50%.
> This is "system" utilization, not userland.  I assume it's in a wcfxs
> interrupt.
>
> The number of interrupts stays constant at about 2004 during each spike,
> leading me to the conclusion that the TDM card is holding an interrupt
> for 500ms every three seconds (50% of 1000ms is 500ms).  This is a
> disaster for spandsp and VoIP in general.
>
> When I unload the wcfxs module, CPU idle goes back to a constant 100%.
>
> The TDM22B card is REV E/F, and I've tried it with several different
> cards.  Fedora Core 3 with linux-2.6.9 downloaded from kernel.org (a
> stock kernel).  The CPU is Athlon K7.
>
> Can anyone please give me a clue?
>
> Thanks,
>
> -- 
> Michael Welter
> Introspect Telephony Corp.
> Denver, Colorado US
> +1.303.674.2575
> mike at introspect.com
> www.introspect.com
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