ATA disk performance (ICH2 controller), some tests
and comparison with Linux2.6.5
Michael Nottebrock
michaelnottebrock at gmx.net
Sat Sep 25 15:57:25 PDT 2004
On Sunday 26 September 2004 00:36, Mauro Triulzi wrote:
> Michael Nottebrock wrote:
> > also substantially impact system performance. If you want to
> > do performance measurement, benchmarking, and optimization,
> > you'll want to turn them off. This includes various WITNESS-
> > related kernel options, INVARIANTS, malloc debugging flags
> > in userland, and various verbose features in the kernel. Many
> > developers choose to disable these features on build machines
> > to maximize performance.
> >
> >So... did you turn off all those?
>
> Yes of course:
>
> foo# uname -a
> FreeBSD foo.bar.com 6.0-CURRENT FreeBSD 6.0-CURRENT #0: Sat Sep 25
> 17:54:29 CEST 2004
> triulzi at foo.bar.com
> <http://lists.freebsd.org/mailman/listinfo/freebsd-current>:/usr/src/sys/i3
>86/compile/MYKERNEL i386
>
> source tree actualized and built today, *all debugging options disabled
There's more places than the kernel config to turn off performance killing
debugging, in particular malloc's options - in CURRENT it defaults to AJ,
while on releases/stable it defaults to aj (see malloc manpage, paragraph
TUNING).
--
,_, | Michael Nottebrock | lofi at freebsd.org
(/^ ^\) | FreeBSD - The Power to Serve | http://www.freebsd.org
\u/ | K Desktop Environment on FreeBSD | http://freebsd.kde.org
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