All this talk reminds me of one thing, how expensive tcp_ack() is.
And this expense has nothing to do with TCP really. The main cost is
purging and freeing up the skbs which have been ACK'd in the
retransmit queue.
So tcp_ack() sort of inherits the cost of freeing a bunch of SKBs
which haven't been touched by the cpu in some time and are thus nearly
guarenteed to be cold in the cache.
This is the kind of work we could think about batching to user
sleeping on some socket call.
Ultimately isn't that just trying to squeeze the balloon?
rick jones
nice to see people seeing ACKs as expensive though :)
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