On Thu, Jan 12, 2012 at 09:56:39AM +1100, Benjamin Herrenschmidt wrote:

I'd suggest doing a simple user space app that creates such a ring,
forks, and produce / consume. We can then run that through perf and
analyze the cache behaviour, maximum throughput, etc....

Cheers,
Ben.

Sure. You can also use my tools/virtio hack: this rebuilds virtio
ring code in userspace, has the advantage of reusing
actual kernel code, so it's up to date, has same barriers, etc.

-- 
MST