Re: [SLUG] Top and hyperthreading.

[DaZZa <dazza@xxxxxxxxxx>]

On Wed, 25 Aug 2004, Jeff Ai wrote:

> Hi guys,
>   Recently i upgraded from FC1 to FC2. My machine's got a P4 2.8 HT,
> kernel is 2.6.8-1.521smp , lilo.conf has acpismp=force.
>
> i found something quite strange.
> 1. cat /proc/cupinfo shows there are 2 CPUs, which is what i expected.
> 2. top shows only CPU. I remember with FC1 2.4.*smp kernel, i could see
> 2 CPUs in "top".
> 3. I am not noticing a dramatic change in performance, so i am not sure
> if HT is actually working on my machine.
>
> is there anything missing?

Try pressing "1" or "I" when running top.

By default, top displays a total of CPU useage/time. Pressing "1" changes
the display to show individual CPU's.

Of course, this assumes your kernel is actually using both CPU's - have
you compiled/booted with an SMP enabled kernel?

DaZZa