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Use m_collapse(9) instead of m_defrag(9) in e1000 drivers

Authored by marius on Dec 28 2015, 12:26 AM.
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Given that em(4), lem(4) and igb(4) hardware doesn't require the
alignment guarantees provided by m_defrag(9), use m_collapse(9)
instead for performance reasons.
While at it, sanitize the statistics softc members, i. e. retire
unused ones and add SYSCTL nodes missing for actually used ones.

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marius retitled this revision from to Use m_collapse(9) instead of m_defrag(9) in e1000 drivers.
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This looks fine and an improvement.

This revision is now accepted and ready to land.Jan 5 2016, 5:41 PM
This revision was automatically updated to reflect the committed changes.