Paul Durrant wrote:
Mark Johnson wrote:
This is a good area to investigate. I don't believe a new
DDI interface is the way to approach it though (e.g.
ddi_dma_mblk_bind_handle()). It should be an option to be
done for you in gld. i.e. gld gives you a list of cookies
that fit within your dma constraints (dma_attr).
Why not put it in the DDI? There's nothing GLD specific about DMA.
Who else would use it besides NICs?
There's more to it than just caching a PFN though. The real
solution is to bring the rx and tx code path optimizations
around buffer management into a common piece of code (I know
it sounds blue sky :-), but it's what's needed long term).
It's more important to bring all the NICs up to a consistent
level. I would expect different code paths for both different
platforms and different NIC properties.
The diversity of NIC h/s is the reason why the goal of common codepath
optimization is probably not realistic. I've come across many NIC
drivers and the schemes for driving different chips is usually too
diverse; it would be possible to make code common but it would just be
equally bad on all chips.
I certainly can see difficulties on the rx side. It would
be interesting to hear about a case which was a one off one
though.. I would imagine you would be able to bin most of
them.
I'd be interested in examples on the TX side where this
is the case.
Thanks,
MRJ
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