netdev - Re: [PATCH 3/7] dccp tfrc: Suppress unavoidable "below resolution" warning

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Message-ID: <5640c7e00807291156m2af40714h5bbaa0e7677a6f44@mail.gmail.com>
Date:	Wed, 30 Jul 2008 06:56:22 +1200
From:	"Ian McDonald" <ian.mcdonald@...di.co.nz>
To:	"Gerrit Renker" <gerrit@....abdn.ac.uk>
Cc:	dccp@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 3/7] dccp tfrc: Suppress unavoidable "below resolution" warning

On Tue, Jul 29, 2008 at 6:13 AM, Gerrit Renker <gerrit@....abdn.ac.uk> wrote:
> In the congestion-avoidance phase a decay of p towards 0 is natural once fewer
> losses are encountered. Hence the warning message "p is below resolution" is
> not necessary, and thus turned into a debug message by this patch.
>
> The TFRC_SMALLEST_P is needed since in theory p never actually reaches 0. When
> no further losses are encountered, the loss interval I_0 grows in length,
> causing p to decrease towards 0, causing X_calc = s/(RTT * f(p)) to increase.
>
> With the given minimum-resolution this congestion avoidance phase stops at some
> fixed value, an approximation formula has been added to the documentation.
>
> Signed-off-by: Gerrit Renker <gerrit@....abdn.ac.uk>

Signed-off-by: Ian McDonald <ian.mcdonald@...di.co.nz>
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