netdev - Re: [PATCH net-next-2.6] tc: report informations for multiqueue devices

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Date:	Wed, 02 Sep 2009 19:50:43 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Stephen Hemminger <shemminger@...tta.com>,
	David Miller <davem@...emloft.net>, jarkao2@...il.com,
	cl@...ux-foundation.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next-2.6] tc: report informations for multiqueue devices

Eric Dumazet wrote:
> Patrick McHardy a écrit :
>> Just to avoid duplicate work - I'm currently trying to put a patch
>> together that presents multiqueue qdiscs to userspace as regular
>> child qdiscs of a dummy qdisc, which also contains the aggregated
>> statistics. So far it actually looks pretty sane :)
> 
> There is one thing that bothers me with "tc -s -d qdisc", maybe
> its the right time to speak
> 
> qdisc pfifo_fast 0: dev eth0 root bands 3 priomap  1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1
>  Sent 54823 bytes 490 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 0bit 0pps backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: dev eth1 root bands 3 priomap  1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1
>  Sent 468 bytes 6 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 0bit 0pps backlog 0b 0p requeues 0
> 
> 
> The rate estimation is given by kernel even if no rate estimation is performed.
> 
> User space doesnt have an indication saying this 0 numbers are real or fake
> (rate 0bit 0pps).
> 
> Could we set a bit at Qdisc level when a gen_new_estimator() is really
> done one a Qdisc, so that we do not call gnet_stats_copy_rate_est()
> from tc_fill_qdisc() if this bit is not set ?

That should be possible, I'll look into it once I've finished my patch.
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