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

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Message-ID: <1295032867.3977.1.camel@edumazet-laptop>
Date:	Fri, 14 Jan 2011 20:21:07 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Patrick McHardy <kaber@...sh.net>, jamal <hadi@...erus.ca>,
	Jarek Poplawski <jarkao2@...il.com>
Subject: Re: [PATCH] net_sched: accurate bytes/packets stats/rates

Le vendredi 14 janvier 2011 à 11:03 -0800, Stephen Hemminger a écrit :
> 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>
> 
> CC: Patrick McHardy <kaber@...sh.net>
> CC: Jarek Poplawski <jarkao2@...il.com>
> CC: jamal <hadi@...erus.ca>
> ---
> sch_fifo now changed to use __qdisc_queue_drop_head which
> keeps correct statistics and is actually clearer.
> 
>  

Thanks for doing this Stephen, this version seems fine.


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