This issue was brought up on the kernel mailing list
https://lkml.org/lkml/2013/6/20/581
The issue is partially due to the massive number of soft interrupts
being generated by this job, and the frequency at which top is doing the
sampling. Increasing the sampling rate should improve accuracy, but
increased sampling requires stealing time from the processes themselves.
Unfortunately this job type is a limitation of the accounting in the
kernel, and can not be fixed without negatively affecting performance or
significantly rewriting the kernel accounting subsystem in a way
currently not invented.
As a result we will be closing this bug within the next 4 days if there
are no objections.
** Changed in: linux (Ubuntu)
Status: Confirmed => In Progress
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https://bugs.launchpad.net/bugs/1193073
Title:
cpu usage does not match sum of per-process usage
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