not that i disagree with the general idea and rationale, but reality is
what it is today for some reasons:
At 07:23 AM 16/09/2004, Jeff Garzik wrote:
Jeff, who would love to have a bunch of Athlons
on PCI cards to play with.
. . . this ignore the realities of power restrictions of PCI today . . .
sure, one could create a PCI card that takes a power-connector, but that
don't scale so well either . . .
At 07:29 AM 16/09/2004, David S. Miller wrote:
I think a better goal is "offload 90+% of the net stack cost" which
is effectively what TSO does on the send side.
This is why these discussions are so circular.
TSO works on LAN-like environments (zero latency, minimal drop), it doesn't
work so well across the internet . . .
i believe that there are better alternatives than TSO, but it involves NICs
having decent scatter-gather DMA engines and being able to be handled
multiple transactions (packets/frames) at once.
in theory, NICs like tg2/tg3 should be capable of implementing something
like this -- if one could get to the ucode on the embedded cores.
at least with PCI Express the general architecture of a PC starts to have a
hope of keeping up with Moore's law.
the same couldn't be said prior to DDR-SDRAM and higher front-side-bus