[gPXE] Painfully slow Windows 7 booting over gPXE

[Andrey Kuzmin]

> Seems  like a network problem to me
> The trace is full of retransmissions each retransmit occurs after 250 ms
> time out.....
> Even 1st dhcp offer is missed and 1st iSCSI TCP session setup fails on tcp
> 3way handshake.

> I'd first look into full/half duplex settings on switches and nic

Hm,  good  point.  I'll try to simplify network configuration to figure
out what is introducing such issues.