From: Jonathan Morton <chromatix99@gmail.com>
To: "David P. Reed" <dpreed@deepplum.com>
Cc: Bob McMahon <bob.mcmahon@broadcom.com>,
Make-Wifi-fast <make-wifi-fast@lists.bufferbloat.net>
Subject: Re: [Make-wifi-fast] Status of the industry on over buffering at the WiFi air interface
Date: Fri, 14 Feb 2020 00:36:35 +0200 [thread overview]
Message-ID: <353B0939-F7FE-49C3-B637-2AEDE00C7E5B@gmail.com> (raw)
In-Reply-To: <1581632601.347810479@apps.rackspace.com>
> On 14 Feb, 2020, at 12:23 am, David P. Reed <dpreed@deepplum.com> wrote:
>
> The modem clearly is capable of giving congestion control signals to a directly connected Ethernet path (non-wireless), by dropping packets.
No - by sending Pause frames back. It's an increasingly-used method of applying back pressure on an Ethernet link, in preference to dropping packets. If it *did* drop packets, you wouldn't get an F grade for bloat.
So the Nighthawk is correctly halting Ethernet output in response to those frames (it's probably a function of the NIC hardware or driver), but exercises absolutely no control over the queue that builds up as a result.
- Jonathan Morton
next prev parent reply other threads:[~2020-02-13 22:36 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-13 0:08 David P. Reed
2020-02-13 0:36 ` Bob McMahon
2020-02-13 1:56 ` David P. Reed
2020-02-13 6:27 ` Bob McMahon
[not found] ` <mailman.471.1581575247.1241.make-wifi-fast@lists.bufferbloat.net>
2020-02-13 21:32 ` Bob McMahon
2020-02-13 22:23 ` David P. Reed
2020-02-13 22:36 ` Jonathan Morton [this message]
2020-02-13 23:49 ` Bob McMahon
2020-02-14 16:40 ` David P. Reed
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