From mboxrd@z Thu Jan  1 00:00:00 1970
From: ali.akyurek.ext@siemens.com (Akyurek, Ali (EXT))
Date: Thu, 15 Jan 2009 15:45:03 +0100
Subject: [ltt-dev] Interpreting tracing results
Message-ID: <1E65288790442545B413D69F2A8D27DE045EBBC4@ERLD164A.ww004.siemens.net>


Hi all,

In my arm machine, context switching takes 1220 or 1221 nanoseconds. 
i thought this time as (start of sched_schedule - start of
whatever_previous_event), Actually that is the time between different
PID values in rows.am i right?

and

Handling of interrupts (i take only the top handlers, not soft ones.)
takes 2441 nanoseconds.
i thought this time as (end of irq_exit - start of irq_entry), am i
right?

Why are these values multiple of 1220 nanoseconds? What is related to? 

Thanks all.