Messages in this thread | | | Date | Wed, 10 Jul 2002 14:27:01 -0700 | From | Nivedita Singhvi <> | Subject | Re: How many copies to get from NIC RX to user read()? |
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> So, to make sure I have this right: > > When the data is processed from the NIC > tcp_rcv_established() is called in processing it > if a user process is waiting on the socket > iovec copy data to the user > else > copy it to receive_queue or backlog_queue
well, we append the skb to the tail of the queue. this is not a copy operation. (just a few instructions).
> When the user tries read (in any way) a socket > iovec copy from receive_queue or backlog_queue > > > E.g., if the user is ready for the data, dump it straight from > SKBs. Else, > don't waste SKBs on a lazy (or busy) user and copy the data to a > queue.
yep.
> If this is right, I'm happy :) If it's wrong, please correct. > > Thx, > --Gus
I should add that my reading of the code is hardly authoritative :). caveat emptor...
thanks, Nivedita
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