On Thu, 2013-10-17 at 11:19 -0700, H. Peter Anvin wrote:

Seriously, though, how much does it matter?  All the above seems likely
to do is to drown the signal by adding noise.

I don't think so.

If the parallel (threaded) checksumming is faster, which theory says it
should and microbenchmarking confirms, how important are the
macrobenchmarks?

Seriously, micro benchmarks are very misleading.

I spent time on this patch, and found no changes on real workloads.

I was excited first, then disappointed.

I hope we will find the real issue, as I really don't care of micro
benchmarks.