Timers and timing, was: MySQL Performance 6.0rc1

[David Xu]

Poul-Henning Kamp wrote:
> In message <4361F057.4030904 at pp.nic.fi>, Pertti Kosunen writes:
> 
> 
>>Does polling affect to this test?
> 
> 
> Not apart from the CPU overhead.
> 
> 	sysctl kern.timecounter.hardware
> 
> is much more important.
> 
> and all the reports here which fail to include it are mostly
> useless.
> 
> 
I suspect because our time() function in libc uses gettimeofday,
this further causes lots of gettimeofday syscall.