netdev - Re: [patch net-next v5 07/11] tbf: improved accuracy at high rates

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Message-Id: <20130212.190129.786462983311147543.davem@davemloft.net>
Date:	Tue, 12 Feb 2013 19:01:29 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	jiri@...nulli.us
Cc:	netdev@...r.kernel.org, edumazet@...gle.com, jhs@...atatu.com,
	kuznet@....inr.ac.ru, j.vimal@...il.com
Subject: Re: [patch net-next v5 07/11] tbf: improved accuracy at high rates

From: Jiri Pirko <jiri@...nulli.us>
Date: Tue, 12 Feb 2013 11:12:05 +0100

> Current TBF uses rate table computed by the "tc" userspace program,
> which has the following issue:
> 
> The rate table has 256 entries to map packet lengths to
> token (time units).  With TSO sized packets, the 256 entry granularity
> leads to loss/gain of rate, making the token bucket inaccurate.
> 
> Thus, instead of relying on rate table, this patch explicitly computes
> the time and accounts for packet transmission times with nanosecond
> granularity.
> 
> This is a followup to 56b765b79e9a78dc7d3f8850ba5e5567205a3ecd

Please reference commits by commit ID and also the commit log header
text (in parenthesis and double quotes), in order to remove ambiguity
when changes are applies into multiple trees.

> 
> Signed-off-by: Jiri Pirko <jiri@...nulli.us>

Applied.
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