Questions on the scheduler
kris at FreeBSD.org
Sat Sep 29 09:45:18 PDT 2007
Oliver Herold wrote:
> Are there any numbers or technical papers? Just out of curiosity.
I ran a mysql benchmark against Dragonfly-current and FreeBSD 7 on an
8-core machine (one of the workloads that FreeBSD now performs very well
at) and found 0 scaling on dragonfly. Their developers confirmed that
the kernel is still entirely giant locked (as in FreeBSD 4) so no SMP
performance benefits are possible.
The email thread is here:
although the linked graph is offline. The FreeBSD curve was essentially
this one (FreeBSD has improved further since then):
with dragonfly a flat line at ~500 tps independent of load.
More information about the freebsd-questions