Re: critical_enter()/critical_exit() overheads in an SMP system

[Terry Lambert]

Matthew Dillon wrote:
> :pid 214 guid/sec 687816                Two TU's running, old critical_*()
> :pid 214 guid/sec 687632                1.454 uS/call
> :pid 214 guid/sec 687857
> :pid 214 guid/sec 687887
> :pid 214 guid/sec 667454                new critical_*()
> :pid 214 guid/sec 667562                1.496 uS/call           --> 41 nS
> :pid 214 guid/sec 668551
> :pid 214 guid/sec 668686
> :pid 214 guid/sec 668789
> 
>     Boy, I'm batting 0 tonight!  Those numbers are reversed :-).
>     new_critical is the top number (the faster 1.454 uS/call) and
>     old_critical is the bottom number (1.496 uS/call).

I'll have to remember this trick of swapping numbers the
next time I have a competitive benchmark that's slower
than the competition.  8-) 8-).

-- Terry

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