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From: Dennis Fedtke <dennisfedtke@gmail.com>
To: cake@lists.bufferbloat.net
Subject: Re: [Cake] overhead and mpu
Date: Tue, 5 Sep 2017 08:00:04 +0200	[thread overview]
Message-ID: <a8c755c0-4c98-d4bb-263c-0491674a5777@gmail.com> (raw)
In-Reply-To: <d8d9280a-f2db-5def-2e11-e7c69f769107@gmail.com>

Hi Ryan,

Thanks for you answers.
Lets assume again ethernet over docsis connection at 50 Mbit/s.
So to get 50 Mbit/s ethernet perfomance, the docsis link speed needs to be set at a higher link speed to compensate for the 18 header ethernet overhead, or?
or
Assuming:
The docsis link syncs at exactly 50Mbit/s. When cake is set to exactly 50Mbit/s, it is actually set at a higher speed then the link actually is.

For mpu why 64?
I assume minimum 46bytes ethernet payload + 18bytes header?

But why does cake use hard_header_len for the header size which is 14 bytes?

I don't know how packet sheduler system works, but maybe it is not needed to include the ethernet header.

cake does work on ip pakets or? so this is layer3 i think.
the hole thing with ethernet headers is happening in layer2.
This would change the minimum packet size to 46 or?

Thanks.


  parent reply	other threads:[~2017-09-05  6:00 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-05  2:46 Dennis Fedtke
2017-09-05  3:26 ` Ryan Mounce
2017-09-05  3:37   ` Ryan Mounce
2017-09-05  6:00 ` Dennis Fedtke [this message]
2017-09-05  6:49   ` Ryan Mounce
2017-09-05  6:58   ` Jonathan Morton
2017-09-05 20:19     ` Dennis Fedtke
2017-09-06  1:45       ` Ryan Mounce
2017-09-06  7:26         ` Sebastian Moeller
2017-09-07  4:11           ` Dennis Fedtke
2017-09-07  4:18             ` Dennis Fedtke
2017-09-07  4:25               ` Jonathan Morton
2017-09-07  7:41                 ` Dennis Fedtke
2017-09-07  7:58                 ` Sebastian Moeller
2017-09-07  7:47             ` Sebastian Moeller
2017-09-07  7:58               ` Dennis Fedtke
2017-09-07  8:07                 ` Sebastian Moeller
2017-09-06  7:22       ` Sebastian Moeller
2017-09-05  8:01   ` Sebastian Moeller
2017-09-05  8:35     ` Kevin Darbyshire-Bryant
2017-09-05  8:58       ` Sebastian Moeller
2017-09-05 14:37         ` Ryan Mounce
2017-09-05 15:06           ` Sebastian Moeller
2017-09-05 15:33           ` Kevin Darbyshire-Bryant

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