Re: NET_SCHED cbq dropping too many packets on a bonding interface

[Kingsley Foreman]

--------------------------------------------------
From: "Jarek Poplawski" <jarkao2@xxxxxxxxx>
Sent: Friday, May 16, 2008 4:16 AM
To: "Patrick McHardy" <kaber@xxxxxxxxx>
Cc: "Kingsley Foreman" <kingsley@xxxxxxxxxxxxxxxx>; "Eric Dumazet" 
<dada1@xxxxxxxxxxxxx>; "Andrew Morton" <akpm@xxxxxxxxxxxxxxxxxxxx>; 
<linux-kernel@xxxxxxxxxxxxxxx>; <netdev@xxxxxxxxxxxxxxx>
Subject: Re: NET_SCHED cbq dropping too many packets on a bonding interface

> On Thu, May 15, 2008 at 08:32:44PM +0200, Patrick McHardy wrote:
> > Jarek Poplawski wrote:
> > > On Thu, May 15, 2008 at 06:09:36PM +0200, Patrick McHardy wrote:
> > > ...
> > > > Do things improve if you set txqueuelen to a larger value
> > > > *before* configuring the qdiscs?
> > >
> > > BTW, I hope it was *before*, but since pfifo_fast_enqueue() uses
> > > "qdisc->dev->tx_queue_len" does it really matter? (Until it's
> > > before the test of course...)
> >
> >
> > Yes, CBQ uses pfifo, not pfifo_fast. pfifo uses txqueuelen
> > to inialize q->limit, but thats whats used during ->enqueue().
>
> ...My bad! I missed this and this (only!?) seems to explain this
> puzzle. So, I hope it was really because *not before* (and not only
> size matters...)
>
> Thanks,
> Jarek P.

running

tc qdisc add dev bond0 root pfifo limit 1000

or

tc qdisc add dev bond0 root handle 1: cbq bandwidth 2000Mbit avpkt 1000 cell 
0
tc qdisc add dev bond0 parent 1: pfifo limit 1000


doesn't appear to be dropping packets. 

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