Re: new benchmarks. WAS: FreeBSD MySQL still WAY slower than Linux

Greg 'groggy' Lehey wrote:

> I've heard this claim again and again, and I intend to look at it when
> I have time.  I find it difficult to believe that this alone could
> explain the sometimes horrendous performance differences (3 to 1) that
> have been reported.
>
> Can somebody tell me:
>
> 1.  How many calls there are per second?
> 2.  Where they're coming from?  This would involve profiling, of
>    course.
>
> Greg
> --
> See complete headers for address and phone numbers.
>  
You find ktrace result of mysql:
http://people.freebsd.org/~davidxu/mysql/mysql_ktrace.txt
gettimeofday() almost follows every network I/O.

Also you can find its I/O size:
http://people.freebsd.org/~davidxu/mysql/iosize.txt

I guess the gettimeofday() call is relevant to mysql's
connection keepalive work, sounds like a very silly method.

David Xu

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