2009/1/30 Mister Olli <mister.o...@googlemail.com>:

> I've run on 100HZ quite some time now and did have the impression that
> 8-CURRENT is slow. It's even faster on copy processes as 7 under VMware
> on a host machine which is 3 years younger...

This might or (probably) might not be due to HZ.

If you're interested in testing, here's what you should do:

1. compile a 8-CURRENT kernel without debugging (WITNESS, INVARIANTS &
their support kernel options)
2. compile a 8-CURRENT world without malloc debugging (see
http://wiki.freebsd.org/DefaultDebuggingKnobs)
3. run some repeatable tests - I'd suggest some file system benchmarks
on a RAM (md) drive, see http://man.freebsd.org/md like bonnie++ and
blogbench and some network tests with iperf
4. change HZ in loader.conf and test again, in exactly the same way as
before (in 3.)

Benchmarks that are not repeatable are useless. Repeatable means by
you (so e.g. the host machine must be in the same state - no
additional programs running, etc., see
http://wiki.freebsd.org/BenchmarkAdvice) and by others when following
your steps exactly.
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