From: Ulrich Drepper <redacted>
Date: Tue, 01 Aug 2006 00:53:10 -0700

This is the case to keep in mind here.  I thought Zach and the other
involved in the discussions in Ottawa said this has been shown to be a
problem and that a ring buffer implementation with something other than
simple front and back pointers is preferable.

This is part of why I suggested VJ style channel data
structure.  At worst, the cachelines for the entries get
into shared modified state when the remove userland cpu
reads the slot.