From: Jonathan Morton <chromatix99@gmail.com>
To: Jendaipou Palmei <jendaipoupalmei@gmail.com>
Cc: Dave Taht <dave.taht@gmail.com>,
dave@taht.net, cake@lists.bufferbloat.net
Subject: Re: [Cake] COBALT implementation in ns-3 with results under different traffic scenarios
Date: Sun, 9 Dec 2018 15:21:26 +0200 [thread overview]
Message-ID: <8467184E-7C35-4AFE-9CC6-292215022FDB@gmail.com> (raw)
In-Reply-To: <CAFLFmiWsHxbVH-_6x6mxZf6yhR=0W3Ojc3iVPD2saPZhBgOMvw@mail.gmail.com>
> On 9 Dec, 2018, at 10:37 am, Jendaipou Palmei <jendaipoupalmei@gmail.com> wrote:
>
> By hidden queues, do you mean the NIC buffers? ns-3 has a Linux-like traffic control wherein the packets dequeued by a queue discipline are enqueued into NIC buffer.
That's right. Linux now uses BQL, which (given compatible NIC drivers) limits the number of packets in the NIC buffers to a very small value - much smaller than is evident from your data. If you were to measure the end-to-end RTT of each, I'm certain you would see this effect dominating the mere 50ms latency you're trying to model.
Ideally, AQM would applied to the hardware queue anyway. For simulation purposes, I recommend reducing the NIC buffer on the bottleneck interface to 1 packet, so that the simulated AQM's effects are easiest to measure.
- Jonathan Morton
next prev parent reply other threads:[~2018-12-09 13:21 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-22 13:57 Jendaipou Palmei
2018-11-22 15:32 ` Dave Taht
2018-11-23 10:52 ` Jendaipou Palmei
2018-11-23 16:05 ` Dave Taht
2018-11-23 16:43 ` Dave Taht
2018-11-23 17:13 ` Jonathan Morton
2018-11-24 2:59 ` Jonathan Morton
2018-11-25 6:22 ` Jendaipou Palmei
2018-11-27 14:10 ` Jendaipou Palmei
2018-11-27 14:36 ` Jonathan Morton
2018-11-30 11:53 ` Jendaipou Palmei
2018-11-30 11:58 ` Jonathan Morton
2018-12-04 10:31 ` Jendaipou Palmei
2018-12-04 14:39 ` Dave Taht
2018-12-04 15:02 ` Jonathan Morton
2018-12-04 15:20 ` Dave Taht
2018-12-05 12:23 ` Jendaipou Palmei
2018-12-05 14:23 ` Jonathan Morton
2018-12-06 17:36 ` Jonathan Morton
2018-12-09 8:37 ` Jendaipou Palmei
2018-12-09 13:21 ` Jonathan Morton [this message]
2018-12-10 12:30 ` Jendaipou Palmei
2018-12-10 15:15 ` Jonathan Morton
2018-12-15 19:06 ` Shefali Gupta
2018-12-15 20:10 ` Dave Taht
2018-12-21 10:37 ` Shefali Gupta
2018-12-21 12:48 ` Jonathan Morton
2019-01-21 11:35 ` Shefali Gupta
2019-01-21 12:57 ` Jonathan Morton
2019-01-23 16:19 ` Shefali Gupta
2019-01-23 16:23 ` Jonathan Morton
2019-01-23 17:27 ` Shefali Gupta
2019-01-25 8:35 ` Shefali Gupta
2019-01-25 9:16 ` Jonathan Morton
2019-01-25 14:48 ` Shefali Gupta
2019-01-25 15:07 ` Jonathan Morton
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