From 26b8f47a66cd6b8d2c66efa2929beee1d53e7994 Mon Sep 17 00:00:00 2001 From: peterho Date: Wed, 17 May 2006 15:25:58 +0000 Subject: [PATCH] Added README git-svn-id: http://ltt.polymtl.ca/svn@1821 04897980-b3bd-0310-b5e0-8ef037075253 --- .../poly/lttv/modules/gui/interrupts/README | 24 +++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 ltt/branches/poly/lttv/modules/gui/interrupts/README 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 -- 2.34.1