Re: Latency, TCP ACKs and upload needs

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. -- f.anthony.n.finch <dot@dotat.at> http://dotat.at/ - I xn--zr8h punycode Humber, Thames: Northwest, veering north or northeast, 4 or 5. Slight or moderate. Fair. Good.