[Asterisk-Users] wcfxs causing constant CPU spikes

[Jim Van Meggelen]

First of all, from what I've read, you need to get rid of the stock
Fedora kernel -- RedHat's kernels seem to get a lot of negative
attention these days. Download a fresh one from www.kernel.org, and
re-complile. Here's some decent instructions: 
http://www.digitalhermit.com/linux/Kernel-Build-HOWTO.html#INTRO

There's more to this than that, but my advice would be to not even
bother until you've built a fresh kernel over the RedHat one. (check out
the list archives -- you're not the only one with this problem).

I'm right in the middle of something that may have a huge impact on all
the IRQ latency issues everyone's been having. Let me know if you're
interested in using your system as a guinea pig.

Cheers,

Jim.


> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com 
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of 
> Eric Bishop
> Sent: December 15, 2004 5:37 PM
> To: asterisk-users at lists.digium.com
> Subject: [Asterisk-Users] wcfxs causing constant CPU spikes
> 
> 
> Hi All,
> 
> I have a problem (at least I think it's a problem) where the 
> wcfxs module causes constant CPU usage spikes. The card being 
> used is a Digium Wildcard TDM400P with 3 FXO modules and 1 
> FXS (TDM31B).
> 
> Monitoring my otherwise idle asterisk box (with top) I see 
> once every 3-5 seconds hi (hardware interrupt) spike to 
> 30%-40% and then drop back to 0 again. This is the case wtih 
> both asterisk stable and CVS HEAD. I am running Fedora Core 2 
> (also tried with Fedora Core 3). I have also tried installing 
> a vanilla kernel as suggested previously on the list, all 
> with the same result. Unloading the wcfxs module fixes the problem.
> 
> Is this normal for the wcfxs module or am I being paranoid? 
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