Julian Elischer wrote:
Julian Elischer wrote:

anyone who has commands and args for their favourite
thing the'd like me to test... send it in..


so far using ttcp I have seem no measureable difference.

but I have more tests to do of course..

for example throughput with small packets with ttcp (KB/Sec)....


x VIMAGE_GLOBALS
+ NO_VIMAGE_GLOBALS
+-----------------------------------------------------------------+
|                                         +   xx                  |
|                                         +   xxx           +     |
|                                         +   xxx   x      ++++   |
|               x        +       x      + +   xxxxxxx      +++++  |
|x    +  ++ xx xxx  +  ++++xxx x x x   +++++ ***xxxxx     ++++++++|
|                        |_____________A______M______|            |
|                           |________________AM________________|  |
+-----------------------------------------------------------------+
    N           Min       Max      Median         Avg      Stddev
x  40      48016.01   57361.32    56268.06   54915.582   2554.0133
+  40      48999.66   59646.59    56261.58   56086.798   3119.1782
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as I said before mst of my tests have shown no real change but this one has the most change I've seen.. it's 160 byte udp packets sent between two identical machines (both using the same kernel each time).


x VIMAGE_GLOBALS
+ NO_VIMAGE_GLOBALS
+-----------------------------------------------------------------+
|                     +   +     ++   xx x x                       |
|                   + +  ++   +x++x +xx x x                       |
|                   + + +++ + +*+**x+xxxx x                       |
|                 + +++ +++x*++*+**x*x*xx x x       x             |
|                 + +*+++++x**+*+**x*x*x*xx x x     xx            |
|                ++++*++++****+*+**x*x****x xxxx   xxx            |
|    + +   xx +  ++++*++*+****+***********x*xxxxx xxxx           x|
|+   +*+++ xx++*+*+*+****+****************x***x*xxx*xx   x  xx   x|
|                         |__________A__________|                 |
|                 |_________A________|                            |
+-----------------------------------------------------------------+
    N           Min       Max    Median        Avg        Stddev
x 150      10175.11  11292.11  10763.80    10760.77    200.92124
+ 150      10075.64  11019.12  10591.68    10580.059   172.29227
Difference at 95.0% confidence
        -180.711 +/- 42.3572
        -1.67935% +/- 0.393626%
        (Student's t, pooled s = 187.155)

this one showed a 1.7% slowdown
where the one above showed a half percent speedup
(but not considered significant).

The first one shown above was TCP with 1500 byte packets on bge 1G interfaces..

more test ideas appreciated...

more tests..
this one with iperf...

x NO_VIMAGE_GLOBALS
+ VIMAGE_GLOBALS
+-----------------------------------------------------------------+
|                      +                      x          x x      |
|                      +        +          x  x          x x      |
|                      +     +  +       +  x  x          x x      |
|                      +     +  +       +  x  x          x x      |
|                      +  +  +  +       +  x  x x        x x      |
|                      +  +  +  +       *  x  x x     x  x x      |
|                      +  +  +  +       *  x  * x     x  x x      |
|                      +  +  +  +    +  *  *  * x     x  x x      |
|                      +  +  +  + +  +  *  *  * x     x  x x      |
|                   +  +  +  +  + +  +  *  *  * x     x  x x      |
|                 + +  +  +  +  + +  *  *  *  * x  x  x  x x      |
|                 + +  +  +  +  + *  *  *  *  * *  x  x  x x      |
|                 + +  +  +  +  + *  *  *  *  * *  x  x  x x      |
|              +  + +  +  +  +  * *  *  *  *  * *  *  x  * x  x   |
|x             +  + +  +  *  *  * *  *  *  *  * *  *  *  * x  x  x|
|                                      |________A_________|       |
|                      |________MA_________|                      |
+-----------------------------------------------------------------+
    N       Min       Max      Median         Avg        Stddev
x 120       418       441        435       435.025     3.4089908
+ 120       423       438        429     429.51667     3.4664862
Difference at 95.0% confidence
        -5.50833 +/- 0.869898
        -1.26621% +/- 0.199965%
        (Student's t, pooled s = 3.43786)
bigger is better...



In this case we see that NO_VIMAGE_GLOBALS is better. Over several
iterations I have come to the conclusion that other factors are overwhelming this change and that the effect of clustering all the
'global' variables together into a single global structure is negligible.

If I can get some confirmation of this by  others then
the next step would be to simply remove the VIMAGE_GLOBALS option
and all the global variables it covers.

At least that's what seems next to me..

see:
   http://wiki.freebsd.org/Image/Notes200808DevSummit





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