Mac Pro Late 2008 1GB LAN Problem Yosemite

[hamood10]

In work i have 20 Mac Pro Late 2008 and 5 Mac Pro Late 2013 all connected to server with 1GB LAN speed so all work on 1GB speed
All Mac Pro users connect to server folder for work

I found one hell of annoying problem

i did speed test using "LAN Speed Test" for writing and reading purpose on same folder they use in the server since users with Mac yosemite complains of slowness while they work

In the machines running OS X 10.8.5 i run LAN Speed Test and it gives writing 1GB and reading 1GB

In the machines running OS X 10.10.2 i run LAN Speed Test and it gives writing 100MB and reading 1GB

I was confused so i test on all machines with mac yosemite and they show all the same results

so i took my MacBook Pro Mid 2009 running OS X 10.10.2 and plugin the LAN cable from machines running OS X 10.8.5 (since they show 1GB for R/W) and run the test again ..... i was shocked that it gives me the same results 100MB writing and 1GB reading

Tested Mac Pro Late 2013 running 10.10 & 10.9 they gave the same issue above

Formatted my MacBook Pro to OS X 10.9.5 and it gave me same problem, then formatted to 10.8.5 and it gave me 1GB R/W
Now im 1000% sure its OS X 10.10 & 10.9 problem

Is there any solution regards this problem since i googled without results?

 

[hamood10]

No one can help me ?

 

[mikeboss]

really? you waited 72 minutes until complaining that no one can help... have some patience.

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I started a thread about a similar issue (about a year ago). this might be of interest for you (although it was never solved AFAIR) ->
https://forums.macrumors.com/threads/1734759/