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From: Jonathan Morton <chromatix99@gmail.com>
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To: Sebastian Moeller <moeller0@gmx.de>
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Subject: Re: [Codel] The next slice of cake
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> On 22 Mar, 2015, at 11:39, Sebastian Moeller <moeller0@gmx.de> wrote:
>=20
> I could be out to lunch here, as usual,;but I argue the byte limit =
should include the kernel overhead (could this be based on =
skb->truesize) as this is what counts against real memory. My assumption =
here is that in normal operation we rarely/never get queues to fill up =
to the limit anyways

Such an argument could certainly be made.  Does skb->truesize include =
the skb header, as well as the buffer space allocated?

> (as tho would turn the queue into tail-drop effectively)

But fq_codel (and cake) are a little cleverer than that, even when they =
hit the hard limit.  They still drop from the head, and they shoot the =
longest flow-queue first.

 - Jonathan Morton