How to disable MMX

kjcsb kjcsb at orcon.net.nz
Fri Jun 9 03:54:10 UTC 2006


> On Thu, 2006-06-08 at 20:19 +1200, kjcsb wrote:
>> > kjcsb wrote:
>> >> I wish to disable MMX on my FC4 system. How do I do that preferably
>> >> without
>> >> having to build the kernel from source? Any advice appreciated.
>> >
>> > Erm -- what, why, and to what purpose?
>> >
>> Thanks for the reply. I am using Asterisk (open source PABX) and am
>> experiencing audio break-ups. Posts on the Asterisk user group suggest
>> disabling MMX and since I have tried everything else, I wondered how to 
>> do
>> that.
>
> That's the first time I have heard that. Are you sure they advised you
> to disable MMX in your hardware? I'm asking because you can *enable* MMX
> support in the asterisk Makefile but it is off by default. Did you
> perhaps have MMX support enabled in the asterisk Makefile? If so then
> try to disable it, recompile and test again.
>
I must have misinterpreted the advice! My apologies.

> Frequently audio breakups can be caused by interrupt sharing, crappy
> motherboards and sheer voodoo. Check that your card has it's own
> interrupt and is definitely not sharing it with other components. In
> order to free up interrupts, disable as many things as possible in the
> BIOS like the parallel port, serial ports, USB ports, floppy, unused IDE
> ports etc. And if you have one of those clone X100P cards you're on your
> own. In my experience they suck.
>
Regarding my Asterisk audio woes, refer to my post to the Asterisk Users 
mailing list "Audio problems on Zap & SIP, local network, not IRQ related?".

Regards

Cameron 




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