Subject: Re: InfiniBand/RDMA merge plans for 2.6.24

From: Roland Dreier <[email-masked]>
Date: Fri, 14 Sep 2007 09:09:13 -0700

> The patch is just needed to pick up broadcast MTU size instead of hard
 > coding 2K right now. SKB allocation shouldn't be different with Ethernet
 > Jambo Frame and IPoIB-CM which 64K MTU. I don't understand why it's
 > different. Could you please explain this?

It's exactly the same problem as ethernet jumbo frames.  A web search
for '"order 1" failure e1000' might be interesting.

IPoIB CM handles this properly by gathering together single pages in
skbs' fragment lists.

 - R.