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

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Message-ID: <CAEnQRZAj4H9neNsGB8hkrQO5trvP8QimhKhpnwchjTVrAo2LGQ@mail.gmail.com>
Date:	Fri, 28 Oct 2011 11:01:51 +0300
From:	Daniel Baluta <daniel.baluta@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	davem@...emloft.net, kuznet@....inr.ac.ru, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net, netdev@...r.kernel.org
Subject: Re: [RFC] tcp: Export TCP Delayed ACK parameters to user

On Fri, Oct 28, 2011 at 3:01 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Le vendredi 28 octobre 2011 à 02:07 +0300, Daniel Baluta a écrit :
>> RFC2581 ($4.2) specifies when an ACK should be generated as follows:
>>
>> " .. an ACK SHOULD be generated for at least every second
>>   full-sized segment, and MUST be generated within 500 ms
>>   of the arrival of the first unacknowledged packet.
>> "
>>
>> We export the number of segments and the timeout limits
>> specified above, so that a user can tune them according
>> to its needs.
>>
>
> Well, this requires user has a machine exclusive use :)

So, this means that setting parameters system wide
isn't an option?

On Windows there is a global setting TcpAckFrequency [1],
which is similar with our tcp_delack_{min,max}.

On Solaris there is a global option tcp_deferred_acks_max [2],
which is similar with our tcp_delack_segs.

Thanks for your comments, I will post an updated patch asap.

Daniel.

[1] http://support.microsoft.com/kb/328890
[2] http://www.sean.de/Solaris/soltune.html
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