netdev - Re: [RFC PATCH net-next] tcp: add CDG congestion control

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Date:	Thu, 4 Jun 2015 17:41:03 +0200
From:	Kenneth Klette Jonassen <kennetkl@....uio.no>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Kenneth Klette Jonassen <kennetkl@....uio.no>,
	netdev <netdev@...r.kernel.org>,
	David Hayes <davihay@....uio.no>,
	Yuchung Cheng <ycheng@...gle.com>,
	Andreas Petlund <apetlund@...ula.no>,
	Dave Taht <dave.taht@...il.com>
Subject: Re: [RFC PATCH net-next] tcp: add CDG congestion control

>> +static  int window __read_mostly = 8;
>
> This is a (readonly) module parameter, but really is a constant (if you
> ever try to change it dynamically, bad things will happen in current
> code)
>
> const int window = 8;

It cannot be adjusted dynamically, but we can override the initial
window parameter when loading tcp_cdg as a module. Imho, this is a
good enough interface when considering that tuning CDG's parameters
are for special interest groups in the first place.

window, backoff_factor and backoff_beta are the most important knobs
that influence CDG's backoff behavior. We could remove window as a
parameter (make it constant), although that would make tuning it
rather tedious. We could also make window adjustable dynamically, but
I opt on waiting until someone needs this functionality before adding
the code. Or am I missing something?
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