[Asterisk-Users] Hyperthreading?

[Peter Corlett]

Andrew Kohlsmith <akohlsmith-asterisk at benshaw.com> wrote:
[...]
> They can't? HT is detected in /proc/cpuinfo (flags) and I see two
> processors with 2.4.25 SMP kernels... What exactly isn't it using?

Linux doesn't realise that scheduling a process onto one virtual CPU
reduces the performance available on the other. There can be some
quite bizarre scheduling decisions made as a result that can slow
things down. On the other hand, for some tasks, it might not cause
problems and thus you'll get a boost.

As ever, the answer is to benchmark your configuration with and
without HT to see. There's no simple answer.

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