Segmentation Offload

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I've been trying to figure out how TCP segmentation 
offload works.  I keep reading about offloading 
segmentation of 64k pieces of data for segmentation and 
that it increases send performance.

I've looked at the Intel driver and the Linux kernel, 
but I can't figure out how they sequence the 
segmentation offload.

How does the NIC perform the segmentation?  Does the 
NIC perform flow control by monitoring the ACKs 
received or does the 64k segment get segmented and sent 
without regard for flow control or is some other flow 
control algorithm used?

- Sidney
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