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

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Message-ID: <1360686841.6884.1.camel@edumazet-glaptop>
Date:	Tue, 12 Feb 2013 08:34:01 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, 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

On Tue, 2013-02-12 at 11:12 +0100, Jiri Pirko wrote:
> 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
> 
> Signed-off-by: Jiri Pirko <jiri@...nulli.us>

Acked-by: Eric Dumazet <edumazet@...gle.com>


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