Re: Latency, TCP ACKs and upload needs

[Tony Finch <dot () dotat at>]

Leo Bicknell <bicknell () ufp org> wrote:
> 1460 byte payloads down, maybe 64 byte acks on the return, and with SACK
> which is widely deployed an ACK every 2-4 packets.  You would see about
> 2,140 packets/sec downstream (25Mbps/1460), and perhaps send 1070 ACKs
> back upstream, at 64 bytes each, or about 68Kbps.  Well under the 1Mbps
> upstream bandwidth.

Note that with delayed ACKs (RFC 1122) there is an ACK for every other
packet; SACK should do better than that.

Tony.
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