Got some solutions myself.
LAG is caused by : NETDEV WATCHDOG eth0 timeout
this is caused bacause of problems with rtl8139 network card in kernel 2.6.x
Solutions :
1.add in lilo.conf : append="noapic"
2.turn apic off in bios
3.if u have 2 rtl8139 cards, then exchange one with some other card type (chipset)
btw. all above was found in various polish forums, but none has worked for me. im switching kernel back to 2.4.22, and will report later .
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