linux-kernel - Fwd: CPU usage

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Message-ID: <CACEExnJJK803EQnVs3sfCOs7fs6-4rmOUsTibA27H3ArGJfrrA@mail.gmail.com>
Date:	Mon, 21 Oct 2013 11:40:45 +0530
From:	王神 <oujin.rera@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Fwd: CPU usage

Hi

I am running a userspace tool that reads/writes ISO data from a USB
device. ( ISO means periodic data). I am measuring load created by the
tool using 'top' tool which shows CPU usage as 0% sometimes and 40%
sometimes.

If the data is periodic why the CPU usage vary so much ? Can any one
point out what is the missing link ? Does any have a better approach
to measure CPU usage.

Thanks in Advance
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