>>>>> "Mipam" == Mipam  <mipam@ibb.net> writes:

    Mipam> I just recompiled a new kernel from the current sources and
    Mipam> installed it. However, i am now getting these messages:
 
    Mipam> Dec 19 00:36:09 mipam /netbsd: wm1: wm_tx_offload: packet
    Mipam> headers did not fit in first mbuf, packet dropped
 
    Mipam> I am seeing lots of these messages. The card is an Intel
    Mipam> i82541GI card. PF is running here on current and i also
    Mipam> enabled checksum offloading as well for this card.
    Mipam> Connectivity is no longer possible now, at least with
    Mipam> checksum offloading enabled.

You are not alone:

  http://www.netbsd.org/cgi-bin/query-pr-single.pl?number=28595