[Cake] [PATCH net-next v12 3/7] sch_cake: Add optional ACK filter

Toke Høiland-Jørgensen toke at toke.dk
Thu May 17 09:11:31 EDT 2018

Eric Dumazet <eric.dumazet at gmail.com> writes:

> On 05/17/2018 04:23 AM, Toke Høiland-Jørgensen wrote:
>> We don't do full parsing of SACKs, no; we were trying to keep things
>> simple... We do detect the presence of SACK options, though, and the
>> presence of SACK options on an ACK will make previous ACKs be considered
>> redundant.
> But they are not redundant in some cases, particularly when reorders
> happen in the network.

Huh. I was under the impression that SACKs were basically cumulative
until cleared.

I.e., in packet sequence ABCDE where B and D are lost, C would have
SACK(B) and E would have SACK(B,D). Are you saying that E would only
have SACK(D)?


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