mysql scaling questions

[Ivan Voras]

On 02/01/2008, Josh Carroll <josh.carroll at gmail.com> wrote:
> > Does anyone have a theory why syscalls are so expensive in FreeBSD? Here
> > are the results of unixbench 4.1 on two machines. First is the machine
> > running FreeBSD HEAD (debugging disabled) on a dual-core Athlon 64 (i386
> > mode), 2 GHz:
>
> I ran the syscall benchmark from UnixBench on the same hardware (Intel
> Q6600 @ 3.2 GHz) for both FreeBSD 7.0-RC1 (amd64) and Knoppix 5.1
> (Linux 2.6.9 PREEMPT kernel, i386).
>
> Per the comments in this thread, i386 syscalls should be less
> expensive than amd64 syscalls, so the results are interesting:
>
> FreeBSD 7.0-RC1 (amd64):  System Call Overhead
> 15000.0  1103233.7      735.5
> Knoppix Linux 2.6.9 (i686):   System Call Overhead
>     15000.0  1108869.7      739.2

> Doesn't look like the syscalls are slower at all on FreeBSD.

Thanks, I'll have to look further to see where the slowdowns are.