newbie SMP questions

[Petri Helenius]

Chris Stenton wrote:

>Hi,
>
>I've just built a dual XEON box running 5.2. Could someone give me some
>pointers on the following.
>
>
>1. I can't find a thread on the pro and cons of having HTT enabled.
>The issue must have been flogged to death somewhere.
>
>  
>
If you run things that spend considerable time behind Giant, disable HTT.
There is also an issue with at least HTT where the system panics on boot
asking "AP #n failed panic y/n?".
For general application/server use, you probably benefit from HTT.

 >2. An old rule of thumb for a single processor machine was to have twice

>the amount of swap space to physical RAM. Is this still the case for a 4
>logical CPU machine? I never understood where that rule of thumb came
>from:-)
>  
>
Does >4G swap work alright anyway?

Pete