forwarding/ipfw/pf evolution (in pps) on -current

[Andre Oppermann]

On 25.04.2013 07:40, Olivier Cochard-Labbé wrote:
> On Wed, Apr 24, 2013 at 1:46 PM, Sami Halabi <sodynet1 at gmail.com> wrote:
>> 3. there some point of improved performance (without fw) that went down
>> again somewhere before Clang got prod.
>
> Found it !
>
> It's commit 242402: "Rework the known mutexes..."

Again one has to be really careful drawing any firm conclusions from this
as it was measured on a Pentium4 and UP kernel (GENERIC would add WITNESS
and INVARIANT overhead as well).

The Pentium4 is about the worst micro-architecture when it comes to locks
and easily regresses.  At the same time modern Intel Core i[3-7] and AMD64
may actually improve with these changes.  Unless more recent micro-archs
have been shown to exhibit the same regression we can't claim this change
was bad (other than for Pentium4).

-- 
Andre

> ministat -s 242401.forwarding 242402.forwarding
> x 242401.forwarding
> + 242402.forwarding
> +---------------------------------------------------------------------------------------+
> |            +
>                   |
> |+ +      +  +
>     x     xx   x x|
> |
>       |____A____| |
> | |_____A_M___|
>                   |
> +---------------------------------------------------------------------------------------+
>      N           Min           Max        Median           Avg        Stddev
> x   5        417527        420242        418902        419074     1049.7974
> +   5        402211        404828        404096        403689     1237.6696
> Difference at 95.0% confidence
>          -15385 +/- 1673.69
>          -3.67119% +/- 0.399377%
>          (Student's t, pooled s = 1147.58)
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