[Rpm] Changes to RPM calculation for MacOS Ventura?

[Sebastian Moeller]

Hi Jonathan,

> On Oct 28, 2022, at 23:45, jf--- via Rpm <rpm at lists.bufferbloat.net> wrote:
> 
> Hopefully, Christoph can provide some details on the changes from the prior networkQuality test, as we’re seeing some pretty large changes in results for the latest RPM tests.
> 
> Where before we’d see results in the >1,500 RPM (and multiple >2,000 RPM results) for a DOCSIS 3.1 line with QoS enabled (180 down/35 up), it now returns peak download RPM of ~600 and ~800 for upload.
> 
> latest results:
> 
> ==== SUMMARY ====
> Uplink capacity: 25.480 Mbps (Accuracy: High)
> Downlink capacity: 137.768 Mbps (Accuracy: High)
> Uplink Responsiveness: Medium (385 RPM) (Accuracy: High)
> Downlink Responsiveness: Medium (376 RPM) (Accuracy: High)
> Idle Latency: 43.875 milli-seconds (Accuracy: High)
> Interface: en8
> Uplink bytes transferred: 35.015 MB
> Downlink bytes transferred: 154.649 MB
> Uplink Flow count: 16
> Downlink Flow count: 12
> Start: 10/28/22, 5:12:30 PM
> End: 10/28/22, 5:12:54 PM
> OS Version: Version 13.0 (Build 22A380)
> 
> Latencies (as monitored via PingPlotter) stay absolutely steady during these tests,
> 
> So unless my ISP coincidentally started having major service issues, I’m scratching my head as to why.
> 
> For contrast, the Ookla result is as follows: https://www.speedtest.net/result/13865976456  with 15ms down, 18ms up loaded latencies.

	[SM] Ookla, IIRC, reports the inter-quartil mean values so the mean of the "central" 50% of the latency samples.


> 
> Further machine details: MacBook Pro 16” (2019) using a USB-C to Ethernet adapter.
> I run with full ECN enabled:
> sudo sysctl -w net.inet.tcp.disable_tcp_heuristics=1 
> 
> sudo sysctl -w net.inet.tcp.ecn_initiate_out=1
> 
> sudo sysctl -w net.inet.tcp.ecn_negotiate_in=1
> 
> and also with instant ack replies:
> 
> sysctl net.inet.tcp.delayed_ack
> net.inet.tcp.delayed_ack: 0
> 
> I did try with delayed_ack=1, and the results were about the same.
> 
> Thanks in advance,
> 
> Jonathan Foulkes
> 
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