ATA disk performance (ICH2 controller), some tests andcomparison with Linux 2.6.5

Mauro Triulzi triulzi at
Sat Sep 25 15:36:59 PDT 2004

Michael Nottebrock wrote:

>On Saturday 25 September 2004 22:59, Mauro Triulzi wrote:
>>I post some tests about the performance of my ATA disk (which is not
>>very spectacular under FREEBSD 6.0).
>Standard disclaimer (copied from UPDATING):
>        FreeBSD 6.x has many debugging features turned on, in
>        both the kernel and userland.  These features attempt to detect
>        incorrect use of system primitives, and encourage loud failure
>        through extra sanity checking and fail stop semantics.  They
>        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 6.0-CURRENT FreeBSD 6.0-CURRENT #0: Sat Sep 25 
17:54:29 CEST 2004     
triulzi at <>:/usr/src/sys/i386/compile/MYKERNEL  i386

source tree actualized and built today, *all debugging options disabled*

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