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Re: Proposal to replace ACK block count with ACK length

Dmitri Tikhonov <dtikhonov@litespeedtech.com> Mon, 11 June 2018 15:43 UTC

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Date: Mon, 11 Jun 2018 11:43:15 -0400
From: Dmitri Tikhonov <dtikhonov@litespeedtech.com>
To: "Deval, Manasi" <manasi.deval@intel.com>
Cc: IETF QUIC WG <quic@ietf.org>
Subject: Re: Proposal to replace ACK block count with ACK length
Message-ID: <20180611154244.GA27622@ubuntu-dmitri>
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On Mon, Jun 11, 2018 at 03:33:35PM +0000, Deval, Manasi wrote:
> -        Moving the ACK length to the front of the ACK allows the
>          flexibility of either reading the entire ACK or reading the
>          first 16 bits and skipping over the length. This is a useful
>          feature for the case where ACK processing is split into
>          multiple layers. Depending on the processor this is run on,
>          there are different advantages -

Just a note.  In my experience, the cost of parsing an ACK frame is
negligible compared to the cost of processing an ACK frame: that is,
poking at various memory locations to discard newly ACKed packets.

  - Dmitri.

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