netdev - Re: [NET] Add proc file to display the state of all qdiscs.

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Message-ID: <20090902091854.GA6530@ff.dom.local>
Date:	Wed, 2 Sep 2009 09:18:54 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org
Subject: Re: [NET] Add proc file to display the state of all qdiscs.

On Wed, Sep 02, 2009 at 10:28:55AM +0200, Eric Dumazet wrote:
> Jarek Poplawski a écrit :
> > [Resent with fixed netdev@ address]
> > 
> > On 02-09-2009 01:52, Christoph Lameter wrote:
> >> [NET] Add proc file to display the state of all qdiscs
> >>
> >> TC is a complicated tool and it currently does not allow the display of all
> >> qdisc states. It does not support multiple tx queues and also not
> >> localhost, nor does it display the current operating state of the queues.
> > 
> > I think, tc should've no problem with displaying summary stats of
> > multiqueue qdiscs or even all of them separately, as mentioned by
> > Patrick. And, maybe I still miss something, but there should be
> > nothing special with tc vs. localhost either.
> >
> 
> I made a patch, but for a 8 queue device (bnx2), here is the "tc -s -d qdisc" result :
> 
> $ tc -s -d qdisc show
> 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 51814 bytes 459 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 0bit 0pps backlog 0b 0p requeues 0
> 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 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 0bit 0pps backlog 0b 0p requeues 0
> 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 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 0bit 0pps backlog 0b 0p requeues 0
> 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 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 0bit 0pps backlog 0b 0p requeues 0
> 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 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 0bit 0pps backlog 0b 0p requeues 0
> 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 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 0bit 0pps backlog 0b 0p requeues 0
> 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 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 0bit 0pps backlog 0b 0p requeues 0
> 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 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 0bit 0pps backlog 0b 0p requeues 0
> 
> 
> Same name "eth0" is displayed, that might confuse parsers...
> 
> What naming convention should we choose for multiqueue devices ?
> 

Hmm... anything could break here something for somebody, so there is
still a (Patrick's) question if not sum it all? Otherwise, I wonder
about using the qdisc handle (tcm_handle>>16): there would be at
least one "pfifo_fast 0:" looking like proper root for somebody...

Jarek P.
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