From: peterho <peterho@04897980-b3bd-0310-b5e0-8ef037075253>
Date: Wed, 17 May 2006 15:25:58 +0000 (+0000)
Subject: Added README
X-Git-Tag: v0.12.20~1668
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=26b8f47a66cd6b8d2c66efa2929beee1d53e7994;p=lttv.git

Added README

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

diff --git a/ltt/branches/poly/lttv/modules/gui/interrupts/README b/ltt/branches/poly/lttv/modules/gui/interrupts/README
new file mode 100644
index 00000000..b0d55698
--- /dev/null
+++ b/ltt/branches/poly/lttv/modules/gui/interrupts/README
@@ -0,0 +1,24 @@
+
+CPUID: processor ID
+
+IrqId: IRQ ID
+
+Frequency (Hz): the number of interruptions per second (Hz)
+
+Total Duration (nsec): the sum of each interrupt duration in nsec
+
+Duration standard deviation (nsec):   taken from 
+http://en.wikipedia.org/wiki/Standard_deviation
+Duration Standard_deviation  = sqrt(1/N Sum ((xi -Xa)^2)) where
+N: the total number of interrupts 
+xi: the duration of an interrupt
+Xa: the average duration is the total duration divided by the total number of interrupts (N)
+
+Max IRQ handler duration (nsec) [time interval]:   the longest IRQ handler duration in nsec.  
+
+Average period (nsec): 1/Frequency
+ 
+Period Standard_deviation  = sqrt(1/N Sum ((xi -Xa)^2)) where
+N:  number of interrupts 
+xi: duration of an interrupt
+Xa: Average period in nsec