Evgeniy Polyakov a écrit :

On Fri, Oct 31, 2008 at 12:57:13PM -0700, Stephen Hemminger (shemminger@vyatta.com) wrote:

quoted

Why bother with last_rx at all on loopback.  I have been thinking
we should figure out a way to get rid of last_rx all together. It only
seems to be used by bonding, and the bonding driver could do the calculation
in its receive handling.

Not related to the regression: bug will be just papered out by this
changes. Having bonding on loopback is somewhat strange idea, but still
this kind of changes is an attempt to make a good play in the bad game:
this loopback-only optimization does not fix the problem.

Just to be clear, this change was not meant to be committed.
It already was rejected by David some years ago (2005, and 2006)

http://www.mail-archive.com/netdev@vger.kernel.org/msg07382.html

If you read my mail, I was *only* saying that tbench results can be sensible to
cache line ping pongs. tbench is a crazy benchmark, and only is a crazy benchmark.

Optimizing linux for tbench sake would be .... crazy ?