[openib-general] why sdp connections cost so much memory

[zhu shi song]

> You should not need this change with the scale patch
> I posted - after applying
> this, and setting the scale parameter to 0x1, each
> connection should use around
> 128K for RX. Please confirm.
Just setting the scale parameter to 0x1, memory
reduction is OK.  But there occurred one bug,
sometimes my kernel crashed. So I think PRE POST buf
size should be changed either.
  zhu

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