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Date:	Sat, 03 Nov 2012 15:25:39 -0400 (EDT)
From:	David Miller <>
Subject: Re: [PATCH net-next V3] htb: improved accuracy at high rates

From: Vimalkumar <>
Date: Wed, 31 Oct 2012 09:04:11 -0700

> Current HTB (and 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 greatly improves accuracy of HTB with a wide
> range of packet sizes.
> Signed-off-by: Vimalkumar <>

Applied, thanks.
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