From: Jonathan Morton <chromatix99@gmail.com>
To: Dave Taht <dave.taht@gmail.com>
Cc: "Toke Høiland-Jørgensen" <toke@redhat.com>,
"Avakash bhat" <avakash261@gmail.com>,
"Vybhav Pai" <vybhavpai1999.vp@gmail.com>,
"Shrinidhi Varna" <shrinidhivarna.171co145@nitk.edu.in>,
"Cake List" <cake@lists.bufferbloat.net>,
"Mohit P. Tahiliani" <tahiliani@nitk.edu.in>,
"Deepak K" <deepakkavoor99@gmail.com>
Subject: Re: [Cake] Query on ACK
Date: Fri, 8 May 2020 18:20:03 +0300 [thread overview]
Message-ID: <7FCC9B1F-7F4B-43E8-B557-88B2A845C28B@gmail.com> (raw)
In-Reply-To: <CAA93jw5OP3EfedB5zDPZNYdQaH+LkhUiwaLzMDbyvnTpxZdqSw@mail.gmail.com>
>> The ACK filter runs on enqueue, so if a queue has only ACKs in it, it
>> will never accumulate anything in the first place...
>
> but the side effect is that on dequeue, it flips it into the fast
> queue drr rotation, not the slow, so it can't accumulate
> as many acks before delivering the one it has left.
>
> Or so I thought, way back when....
The ack filter converts a stream of acks that might be treated as a bulk flow into a sparse flow, which is delivered promptly. This is a good thing; an ack should not be held back solely to see whether another one will arrive.
I think of it as an optimisation to reduce delay of the information in the ack stream, not solely as a way to reduce the bandwidth consumed by the ack stream; the latter is a happy side effect.
- Jonathan Morton
next prev parent reply other threads:[~2020-05-08 15:20 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-06 18:43 Avakash bhat
2020-05-06 19:01 ` Jonathan Morton
2020-05-06 19:13 ` Toke Høiland-Jørgensen
2020-05-07 6:44 ` Avakash bhat
2020-05-07 6:59 ` Jonathan Morton
2020-05-07 7:07 ` Sebastian Moeller
2020-05-08 6:36 ` Avakash bhat
2020-05-08 6:50 ` Dave Taht
2020-05-08 7:41 ` Sebastian Moeller
2020-05-08 15:08 ` Toke Høiland-Jørgensen
2020-05-08 15:11 ` Dave Taht
2020-05-08 15:20 ` Jonathan Morton [this message]
2020-05-08 15:40 ` Dave Taht
2020-05-25 5:17 ` Avakash bhat
2020-05-25 9:42 ` Jonathan Morton
2020-05-25 11:58 ` Toke Høiland-Jørgensen
2020-06-14 12:43 ` Avakash bhat
2020-06-14 14:43 ` Jonathan Morton
2020-06-16 5:22 ` Avakash bhat
2020-06-16 5:31 ` Dave Taht
2020-06-16 5:32 ` Dave Taht
2020-05-08 17:43 ` [Cake] Curious regarding Cake sensitivity to hardware queue depth David P. Reed
2020-05-08 8:23 ` [Cake] Query on ACK Sebastian Moeller
2020-05-06 19:08 ` Toke Høiland-Jørgensen
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