2009/11/4, Dag-Erling Smrgrav <email@example.com>:
> Attilio Rao <attilio@FreeBSD.org> writes:
> > Log:
> > Opteron rev E family of processor expose a bug where, in very rare
> > ocassions, memory barriers semantic is not honoured by the hardware
> > itself. As a result, some random breakage can happen in uninvestigable
> > ways (for further explanation see at the content of the commit itself).
> According to the reference you gave, OpenSolaris has a workaround for
> this issue. Perhaps we should adopt it?
IIRC, based on what I readed on-line, it could be still a WARNING msg,
but I didn't double-check for it.
On the other side, a possible complete solution would involve a
boot-time patching mechanism, but we don't have it right now
(differently from Linux) or disabling the SMP support, but it seems
mostly a too heavy loss of performance due to the rarely appearence of
the bug itself.
I think the WARNING msg is a good compromise to all these other approaches.
Peace can only be achieved by understanding - A. Einstein