O21int
Small interactivity fix

hto1
Hyperthread only tweaks for minor performance improvements and to add
hyperthread awareness to "nice".

batch6
Batch scheduling

htb1
Hyperthread awareness for batch scheduling (requires batch6)

am6
Autoregulate the vm_swappiness

FAQ:
Why do I need hyper-thread awareness for nice?
If you have a hyperthread (P4HT) processor and run it as two logical cpus
you can have a very low priority task running that can consume 50% of your
physical cpu's capacity no matter how high priority tasks you are running.
For example if you use the distributed computing client seti you will be
effectively be running at half your cpu's speed even if you run seti nice
20. Hyperthread awareness prevents this by not allowing a significantly
lower priority task (>10) to run on a cpu's hyperthread sibling.

What's batch scheduling?
Batch scheduling for normal cpus allows only idle time to be used for
batch tasks rather than a percentage of the total cpu time.

Hyperthread awareness for batch scheduling?
Only allows batch tasks to run when both hyperthread siblings
are idle.

You can get the schedtools to make tasks batch scheduled here:
http://freshmeat.net/projects/schedtool/?topic_id=136

It's safest to set tasks as batch after they are already running as signal
handling within the kernel can cause problems with this batch scheduling.