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<p><tt>netdev-owner@vger.kernel.org wrote on 09/13/2007 02:00:43 PM:<br>
<br>
> > Since ehca can support 4K MTU, we would like to see a patch in <br>
> > IPoIB to allow link MTU to be up to 4K instead of current 2K for 2.6.24 <br>
> > kernel. The idea is IPoIB link MTU will pick up a return value from SM's <br>
> > default broadcast MTU. This patch should be a small patch, I hope you are <br>
> > OK with this.<br>
> <br>
> It's actually not small, since it turns the skb allocation into a<br>
> 4100-byte buffer, which ends up being more than 1 page usually, which<br>
> means it fails if memory is fragmented.<br>
> <br>
> Anyway given the backlog anything substantial that hasn't been posted<br>
> already is almost surely going to have to wait until 2.6.25.<br>
</tt><br>
<tt>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?</tt><br>
<br>
<tt>Thanks</tt><br>
<tt>Shirley</tt></body></html>