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[L4s-discuss] Expected ACK ratios with accurate ECN ?

Ingemar Johansson S <ingemar.s.johansson@ericsson.com> Tue, 09 January 2024 07:32 UTC

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From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
To: "l4s-discuss@ietf.org" <l4s-discuss@ietf.org>
CC: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
Thread-Topic: Expected ACK ratios with accurate ECN ?
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Date: Tue, 09 Jan 2024 07:32:08 +0000
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Subject: [L4s-discuss] Expected ACK ratios with accurate ECN ?
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Hi

I wonder what ACK ratios one can expect with Accurate ECN ?.
In one 5G experiment with large file transfers we see a downlink throughput of 1.12Gbps and an uplink bitrate of 4Mbps, attributed to TCP ACKs.
The downlink is loaded close to 100% so one should expect quite frequent L4S marking.

4Mbps in UL and 65 byte ACK packets would mean 7600 ACKs/s
1.12Gbps in DL and 1500 byte packets would mean 93000 pakets/s
This implies an ACK ratio of 1:12. I think that this sounds reasonable, or ?
Regards
/Ingemar


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Ingemar Johansson  M.Sc.
Master Researcher

Ericsson AB
GFTL ER Networks RNS Protocol & E2E Perf
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