Added README

git-svn-id: http://ltt.polymtl.ca/svn@1821 04897980-b3bd-0310-b5e0-8ef037075253

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+\r
+CPUID: processor ID\r
+\r
+IrqId: IRQ ID\r
+\r
+Frequency (Hz): the number of interruptions per second (Hz)\r
+\r
+Total Duration (nsec): the sum of each interrupt duration in nsec\r
+\r
+Duration standard deviation (nsec):   taken from \r
+http://en.wikipedia.org/wiki/Standard_deviation\r
+Duration Standard_deviation  = sqrt(1/N Sum ((xi -Xa)^2)) where\r
+N: the total number of interrupts \r
+xi: the duration of an interrupt\r
+Xa: the average duration is the total duration divided by the total number of interrupts (N)\r
+\r
+Max IRQ handler duration (nsec) [time interval]:   the longest IRQ handler duration in nsec.  \r
+\r
+Average period (nsec): 1/Frequency\r
+ \r
+Period Standard_deviation  = sqrt(1/N Sum ((xi -Xa)^2)) where\r
+N:  number of interrupts \r
+xi: duration of an interrupt\r
+Xa: Average period in nsec\r