All "misterious problems" at the end, have simple solution. In my case, it is unproper reading documentation. :)
I connected control pins (miso, mosi, sck) directly to PORTB connector on ethernet shield, assuming this signals are connected to W5100 from there. But, control pins in case of this shield are connected only to SPI connector, except SS pin, which is connected to digital IO 10, or PORTB.2.
After add some extra wires, now W5100 hapily working even on sligtly increased frequency. At least respond to ping every second.
Thank you Michael for help...
Regards !
Mladen
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