[ixp] [ixp1200] forwarding packet to host kernel

[Kenneth M. Mackenzie]

Here's a link:

	http://www.cc.gatech.edu/~kenmac/asan/asan-san-2.pdf

We intend to post the code for this also, shortly.

The short answers:

o  about 190MB/S IXP->host using IXP's DMA
o  slightly more host->IXP using PIOs with write-combining
o  about half that host->IXP using IXP's DMA but it's a known host chipset bug

The host is a Dell 530 (Xeon w/860 chipset)
The card is the Radisys card with the 21555 bridge
The PCI slot in the host is 64/66 (but the IXP side is 32/66).

-- Ken

> Georgia Tech has a paper with the answer to your question coming up in the
> SAN-2 workshop (held jointly with HPCA 2003):
> 
> 	"Intel IXP1200-based Network Processor"
> 
> it has a lot of details on the limits of passing packets up and down
> between an IXP1200 (the Radisys ENP-2505) and a PC it's put into.