netdev - Re: [PATCH net-next V3] htb: improved accuracy at high rates

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Message-Id: <20121103.152539.2120748963636667268.davem@davemloft.net>
Date:	Sat, 03 Nov 2012 15:25:39 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	j.vimal@...il.com
Cc:	jhs@...atatu.com, eric.dumazet@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next V3] htb: improved accuracy at high rates

From: Vimalkumar <j.vimal@...il.com>
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 <j.vimal@...il.com>

Applied, thanks.
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