0 - 2 of 2 tags for Impact CPU

Hi All,
i would like to know in depth about delta, impact and request CPU's, to know about them please share any links, white papers, docs if any..........
 
thanks in advance.......

I am observing a session thru View Point , which is in responding state for the past 10 days
The CPU Use is 0 but the Impact CPU is 33.7
Similary I/O is 0 but I/O skew is 55%.
Could anyone explain the meaning of the same ,how to interpret the information.