Ok, here is the config:
2 boxes bridged via eoip and connected with wireless 5ghz cards. The problem is when i assign IP address to bridge interface and try to run ping test on it, i get huge packet loss on both computers, but IP address which is behind them works OK. When bridge is disabled pings are back to normal again. When i get packet loss like that i cant even log in the router. Observed no big CPU usage - everything is running fine. Test boxes were two Cell 1.7 ghz 128 ram intel mobo and other 2 were dell old 266 p2 computers. Same on both of them. Interesting part is that test traffic and ping from computers behind those bridges work like a charm with very nice ping times and thoughput.
Need a solution for this problem because it seems unstable to put this setup somewhere in my backbone.