On Thu, Apr 17, 2008 at 12:58 AM, Greg Smith <gsmith(at)gregsmith(dot)com> wrote:
> So in the case of this simple benchmark, I see an enormous performance
> regression from the newest Linux kernel compared to a much older one.
This has been discussed recently on linux-kernel. It's definitely a
regression. Instead of getting a nice, flat overload behavior when
the # of busy threads exceeds the number of CPUs, you get the
declining performance you noted.
Poor PostgreSQL scaling on Linux 2.6.25-rc5 (vs 2.6.22)
http://marc.info/?l=linux-kernel&m=120521826111587&w=2
-jwb