Neil Horman wrote:

Paul Jakma wrote:

quoted

On Wed, 15 Sep 2004, Jeff Garzik wrote:

quoted

Put simply, the "ultimate TOE card" would be a card with network 
ports, a generic CPU (arm, mips, whatever.), some RAM, and some 
flash.  This card's "firmware" is the Linux kernel, configured to run 
as a _totally indepenent network node_, with IP address(es) all its own.

Then, your host system OS will communicate with the Linux kernel 
running on the card across the PCI bus, using IP packets (64K fixed 
MTU).

quoted

The intel IXP's are like the above, XScale+extra-bits host-on-a-PCI 
card running Linux. Or is that what you were referring to with "<cards 
exist> but they are all fairly expensive."?

IBM's PowerNP chip was also very simmilar (a powerpc core with lots of 
hardware assists for DMA and packet inspection in the extended register 
area).  Don't know if they still sell it, but at one time I had heard 
they had booted linux on it.

An IXP or PowerNP wouldn't work for Jeff's idea. The IXP's XScale core 
and PowerNP's PowerPC core are way too slow to do any significant 
processing; they are intended for control tasks like updating the 
routing tables. All the work in the IXP or PowerNP is done by the 
microengines, which have weird, non-Linux-compatible architectures.

To do 10 Gbps Ethernet with Jeff's approach, wouldn't you need a 5-10 
GHz processor on the card? Sounds expensive.

A 440GX or BCM1250 on a cheap PCI card would be fun to play with, though.

Wes Felter - wesley@felter.org - http://felter.org/wesley/