[Asterisk-Users] CPU Optimisations For asterisk

[Robert Boardman]

Thanks for your reply

The system is a small installation but I was thinking about optimizations and 
wondered if there would be any particular benifit
anyway thanks for the reply, your comments are very useful

robb


Quoting Alastair Maw <asterisk at almaw.com>:

> Robert Boardman wrote:
> > How would I compile asterisk for the Athlon XP arch, would there be any 
> > advantage doing this?
> 
> CHOST="i686-pc-linux-gnu"
> CFLAGS="-mcpu=athlon-xp -O3 -pipe"
> 
> Well, it might run slightly faster, but you probably won't really notice 
> the difference. You might well be better off with -O2 rather than -O3, 
> as -O3 tends to agressively unroll branches to inlines which reduces the 
> amount of code that fits on the chip's cache, resulting in slowness. 
> It's swings and roundabouts, really.
> 
> If you're using echo cancelling, it should be quicker if you enable the 
> MMX stuff for that (see the Asterisk Makefile).
> 
> Why do you need the extra speed? If you're desperately trying to 
> optimise things like this to gain extra performance, you must have a 
> pretty big system. Pretty big system should mean you have the cash to 
> upgrade your CPU a bit, which will make much more difference.
> 
> -- 
> Alastair Maw
> MX Telecom - Systems Analyst
> http://www.mxtelecom.com
> 
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