Hi, maybe my bad feeling is just non-sense but when looking on the web for information, it seems that there is no definitive answer I have found so far. Our data network runs at MTU9000 but the last batch of test nodes we bought seem to have problems with Jumbo frame (Yukon2 based NICs) or cannot do Jumbo frames at all (nVidia).
I've run some early tests and these *seem* to suggest that the IP-layer takes correctly care of this (e.g. tcpdump shows that the maximum header length it 1514 bytes when the link is in use). Since famous Wikipeda states "Limit varies by vendor. For correct interoperation whole ethernet network must have same MTU. Usually only seen in special purpose networks." on their page on http://en.wikipedia.org/wiki/Maximum_transmission_unit and others (netbsd-help page IIRC) suggests to separate these nodes from the main network via a router I'm a bit confused who is right. Anyone here knowing much more on networking and can give me thumbs up or down? Thanks Carsten _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
