Gigabit ethernet and jumbo frames

BruceG · Posted: Fri Feb 22, 2008 5:52 pm Post subject: Gigabit ethernet and jumbo frames

I have a network that includes two PCs with gigabit ethernet cards, and I'm trying to get jumbo frames to work between them. The two computers are connected directly without a switch between them. One system has a RTL8111B NIC built into the motherboard, the other has an RTL8169 add-on card.

Communication between the two works fine with the MTU on both ends is set to the standard of 1500. Both NICs support MTUs up to 7200. However, I have tried setting the MTU to several different values above 1500, and bulk transfers stall after only a half dozen packets.

I have tried both the kernel r8169 driver and the RealTek 8168 driver on the RTL8111B card, but there was no difference in behavior. Is there anything else I should try?

Thanks.

sf_alpha · Posted: Sat Feb 23, 2008 9:49 am Post subject:

Some drivers have problems with jumbo frames.

I also got problems with RTL8111B without enable jumbo frames on some boards.

You should try other cards as well.
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