netdev - Re: [PATCH v6 net-next 2/2] tcp: Add Redundant Data Bundling (RDB)

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Message-Id: <20160314204002.13c7eddd064910bced47b5d7@mindspring.com>
Date:	Mon, 14 Mar 2016 20:40:02 -0400
From:	Bill Fink <billfink@...dspring.com>
To:	Yuchung Cheng <ycheng@...gle.com>
Cc:	Bendik Rønning Opstad <bro.devel@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Neal Cardwell <ncardwell@...gle.com>,
	Andreas Petlund <apetlund@...ula.no>,
	Carsten Griwodz <griff@...ula.no>,
	Pål Halvorsen <paalh@...ula.no>,
	Jonas Markussen <jonassm@....uio.no>,
	Kristian Evensen <kristian.evensen@...il.com>,
	Kenneth Klette Jonassen <kennetkl@....uio.no>
Subject: Re: [PATCH v6 net-next 2/2] tcp: Add Redundant Data Bundling (RDB)

On Mon, 14 Mar 2016, Yuchung Cheng wrote:

> On Thu, Mar 3, 2016 at 10:06 AM, Bendik Rønning Opstad
> <bro.devel@...il.com> wrote:
> >
> > Redundant Data Bundling (RDB) is a mechanism for TCP aimed at reducing
> > the latency for applications sending time-dependent data.
...
> > diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
> > index 6a92b15..8f3f3bf 100644
> > --- a/Documentation/networking/ip-sysctl.txt
> > +++ b/Documentation/networking/ip-sysctl.txt
> > @@ -716,6 +716,21 @@ tcp_thin_dpifl_itt_lower_bound - INTEGER
> >         calculated, which is used to classify whether a stream is thin.
> >         Default: 10000
> >
> > +tcp_rdb - BOOLEAN
> > +       Enable RDB for all new TCP connections.
>   Please describe RDB briefly, perhaps with a pointer to your paper.
>    I suggest have three level of controls:
>    0: disable RDB completely
>    1: enable indiv. thin-stream conn. to use RDB via TCP_RDB socket
> options
>    2: enable RDB on all thin-stream conn. by default
> 
>    currently it only provides mode 1 and 2. but there may be cases where
>    the administrator wants to disallow it (e.g., broken middle-boxes).
> 
> > +       Default: 0

A per route setting to enable or disable tcp_rdb, overriding
the global setting, could also be useful to the administrator.
Just a suggestion for potential followup work.

					-Bill