netdev - Re: [RFC v2] tcp: Export TCP Delayed ACK parameters to user

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Date:	Sat, 29 Oct 2011 15:32:25 +0300
From:	Daniel Baluta <dbaluta@...acom.com>
To:	David Miller <davem@...emloft.net>
Cc:	rick.jones2@...com, eric.dumazet@...il.com, kuznet@....inr.ac.ru,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net,
	netdev@...r.kernel.org, luto@...capital.net
Subject: Re: [RFC v2] tcp: Export TCP Delayed ACK parameters to user

On Sat, Oct 29, 2011 at 5:24 AM, David Miller <davem@...emloft.net> wrote:
> From: Rick Jones <rick.jones2@...com>
> Date: Fri, 28 Oct 2011 15:40:24 -0700
>
>> That would be loads faster, but won't that have issues with
>> granularity?
>
> Frankly, I don't care.
>
> For an obscure feature I don't even like to begin with, I refuse
> to allow a multiply into a core code path.

I agree that there is no place for multiplication.

I think the best way to go right now is as follows:
* make TCP Delack params configurable per socket.
* count number of bytes instead of number of segments.

Although, I like more to have tcp_delack_thresh
measured in number of segments instead of number
of bytes I don't see yet a neat solution of how to avoid
the multiplication (shift count is not acceptable because it
limits the available number of segments).

Any comments?

thanks,
Daniel.
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