Yah, that is the obvious choice, but it wasn't as clear cut. Especially with the behavior we were seeing where the performance problems would remain long after

Yah, that is the obvious choice, but it wasn't as clear cut. Especially with the behavior we were seeing where the performance problems would remain long after the lines were flushed from the CPU caches. I spent a fair amount of time looking at Intel docs on snoop filters and the like and never really satisfied myself that I knew exactly what was causing the problem.