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From: Jonathan Morton <chromatix99@gmail.com>
To: "Toke Høiland-Jørgensen" <toke@toke.dk>
Cc: cake@lists.bufferbloat.net
Subject: Re: [Cake] Cake not more CPU efficient than HTB+FQ-CoDel (anymore)?
Date: Wed, 11 Apr 2018 20:59:59 +0300	[thread overview]
Message-ID: <50C2E3D7-975E-4067-9F0C-E32FD6C26041@gmail.com> (raw)
In-Reply-To: <87vacx8wj7.fsf@toke.dk>

> On 11 Apr, 2018, at 8:47 pm, Toke Høiland-Jørgensen <toke@toke.dk> wrote:
> 
>>> Also would be nice to get a measure of the smoothness of the
>>> shaper; will see if I can't extract that from a pcap file or
>>> something
>> 
>> I remember using tcptrace for that purpose, once upon a time.
> 
> Yup, that was my plan as well. Just not sure whether it has a metric
> that is better than "look, the graph is smoother"... ;)

It does have a throughput graph available.  However, this is based on raw inter-packet spacing, so it'll have line-rate bursts interspersed by very short gaps if Cake experiences any scheduling latency greater than the serialisation delay of one MTU.

The best counter to that might be to select a low rate, so that the serialisation delay is 1-2ms or so.  It should then be easy to contrast with HTB's behaviour at that same rate.

 - Jonathan Morton


  reply	other threads:[~2018-04-11 18:00 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-11 15:24 Toke Høiland-Jørgensen
2018-04-11 15:41 ` Jonathan Morton
2018-04-11 17:15   ` Toke Høiland-Jørgensen
2018-04-11 17:23     ` Jonathan Morton
2018-04-11 17:47       ` Toke Høiland-Jørgensen
2018-04-11 17:59         ` Jonathan Morton [this message]
2018-04-11 18:55     ` Jonas Mårtensson
2018-04-11 19:08       ` Toke Høiland-Jørgensen
2018-04-11 19:26       ` Sebastian Moeller
2018-04-11 19:30         ` Sebastian Moeller
2018-04-11 19:56           ` Jonas Mårtensson
2018-04-12 10:48     ` Toke Høiland-Jørgensen
2018-04-11 16:03 ` Pete Heist
2018-04-11 17:16   ` Toke Høiland-Jørgensen
2018-04-14  4:48 ` There is cake qdisc manual Y

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