I am trying to understand why my system is running slowly. I found the sar command, but wanted to know the difference between sar -B and sar -W

I read the man page, and I understand that -B gives me the paging statistics and -W gives me the swapping statistics. What I would like to understand is the following:

What is the correlation between the two sets of statistics.

When should I be concerned about -B and when about -W? ie, what values from each command should I be concerned with?

Which statistic is more closely related to system performance

Thanks

`-W`

on my Debian box shows`-W Statistics about errors for IP (version 4) traffic.`

Without knowing the particulars for your implementation it is difficult to check the man pages, and source to see exactly what statistics are being checked and reported. – Zoredache Aug 20 at 21:25