Latency, error finishing read, and IRQ affinity

Thanks mozmck for all this info and the bash scripts! This solved the weird issues I was running with on this new N100 PC I have.

I decided to brush up on my bash skills and update the original script.  

Features

• Checks that script is being run as root/sudo.
• Attempts to ping the common Mesa card IP addresses (192.168.1.121 and 10.10.10.10) and if it finds a unique one it will set that as the NIC variable in the irq bash scripts. If it doesn't find one it lists the possible options for the user to choose.
  • Downside of this is that it is not as dynamic as mozmck's script if there are any Mesa card interfaces changes, but I figured people rarely change that anyways.
• Give instructions once the script is complete.

How to run

• Rename rt_setup.sh.txt to rt_setup.sh
• Make sure script is executable via command line:

  chmod +x /path/to/rt_setup.sh

  Replace /path/to/rt_setup.sh to where the actual file is.
• Run script: 

  sudo /path/to/rt_setup.sh

  Again replace to where the actual path of the script is

Hopefully this helps those that are not software savvy!