Messages in this thread | | | Date | Mon, 14 Jul 2003 16:03:01 -0400 | From | Jeff Garzik <> | Subject | Re: Alan Shih: "TCP IP Offloading Interface" |
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David griego wrote: > Intel Clusters and Network Storage Volume Platforms Lab reported that it > takes about 1MHz to process 1Mbps on a PIII. Using this rule of thumb > (they showed it scaling from 400MHz to 800MHz) it would take 10GHz to > process 10Mbps. Well you might say "what about multi-processers?" This
Um. It doesn't take nearly 10Ghz to handle 10Mbps, or even 100Mbps.
> would be good for people that have multi-processors, but there is a > large segment of embedded processors that are not going have SMP, or be > at 10GHz anytime soon. Besides that processing interrupts does not > scale across MPs liniarly. The truth is that communication speeds are > outpacing processor speeds at this time.
If the host CPU is a bottleneck after large-send and checksums have been offloaded, then logically you aren't getting any work done _anyway_. You have to interface with the net stack at some point, in which case you incur a fixed cost, for socket handling, TCP exception handling, etc.
Maybe somebody needs to be looking into AMP (asymmetric multiprocessing), too.
Jeff
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