Is Asterisk's high memory usage canceling out most of the performance gained
by using HT?
In my experience, I've found that hyperthreading is a major problem on Linux Kernel 2.4. If I turn on hyperthreading and start to load up an Asterisk box we get ratty sounding audio along with pops, clicks and ticks, but if I disable hyperthreading (noht on the kernel line in lilo/grub) and all of those anomalies go away and the box scales a whole lot higher.
The problem is that the 2.4 Kernel sees the one hyperthreaded processor as two totally separate processors, so the 2.4 kernel tends to mess up, badly, when scheduling the processing.
This problem was delt with in the 2.5 kernel and i've been told by quite a few trusted people that it works flawlessly, but i'm not about to run a unstable kernel (or even anything less than like 2.6.14) on any of my production boxes.
Jeremy McNamara
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