[openib-general] How about ib_send_page() ?

Hal Rosenstock halr at voltaire.com
Tue May 17 04:10:35 PDT 2005


On Mon, 2005-05-16 at 21:55, Jeff Carr wrote:
> Could (or would it help if) the MTU was increased to something much 
> larger than 2044?

As the packet rate is one limiting factor, this has been discussed
before. With UD, the IB limit is 4K (-4 for CRC) but the device limit is
2K (-4), which is the default MTU for IPoIB. hence 2044 for normal
IPoIB. This is one of the main reasons for IPoIB connected mode, which
is not currently supported by OpenIB IPoIB. Given that there are now 2
ULPs which use the CM, this wouldn't be hard to support. (It's more a
matter of someone having some time to do this). Note that IPoIB
connected mode is currently an internet draft.

-- Hal




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