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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