[Ecn-sane] [Cake] l4s kernel submission

[Sebastian Moeller]

Hi Jonathan,


> On Oct 16, 2021, at 10:54, Jonathan Morton <chromatix99 at gmail.com> wrote:
> 
>> On 16 Oct, 2021, at 11:38 am, Sebastian Moeller <moeller0 at gmx.de> wrote:
>> 
>> I also think that some one subscribed should weight in on the exempt one packet from marking, especially in the light of GRO/GSO.
> 
> I do have some experience with this from Cake, but Cake has the distinct benefit of (usually) knowing what the dequeue rate is, without having to estimate it.  Without that knowledge, I'm not sure it's profitable to guess - except to specifically avoid tail *loss*, which is not at all the same as *marking* the last packet.

	Thinking it over, Bob's recommended special casing one packet will be essentially equivalent to increasing the marking target, except for the case of small packets, where you might see/desire marking before the equivalent sojourn time of a full MTU packet is accumulated. My hunch is that is really rare, and the whole exercise will just lead to artificially and non-functionally low marking threshold...  

Regards
	Sebastian


> 
> - Jonathan Morton