netdev - Re: [PATCH] net_sched: accurate bytes/packets stats/rates

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Date:	Thu, 20 Jan 2011 23:31:44 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	shemminger@...tta.com
Cc:	eric.dumazet@...il.com, netdev@...r.kernel.org, kaber@...sh.net,
	hadi@...erus.ca, jarkao2@...il.com
Subject: Re: [PATCH] net_sched: accurate bytes/packets stats/rates

From: Stephen Hemminger <shemminger@...tta.com>
Date: Fri, 14 Jan 2011 11:03:42 -0800

> From Eric Dumazet <eric.dumazet@...il.com>
> 
> In commit 44b8288308ac9d (net_sched: pfifo_head_drop problem), we fixed
> a problem with pfifo_head drops that incorrectly decreased
> sch->bstats.bytes and sch->bstats.packets
> 
> Several qdiscs (CHOKe, SFQ, pfifo_head, ...) are able to drop a
> previously enqueued packet, and bstats cannot be changed, so
> bstats/rates are not accurate (over estimated)
> 
> This patch changes the qdisc_bstats updates to be done at dequeue() time
> instead of enqueue() time. bstats counters no longer account for dropped
> frames, and rates are more correct, since enqueue() bursts dont have
> effect on dequeue() rate.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> Acked-by: Stephen Hemminger <shemminger@...tta.com>

Applied to net-2.6, thanks everyone.
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