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

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Date:	Fri, 16 May 2008 06:57:23 +0930
From:	"Kingsley Foreman" <kingsley@...ernode.com.au>
To:	"Jarek Poplawski" <jarkao2@...il.com>,
	"Patrick McHardy" <kaber@...sh.net>
Cc:	"Eric Dumazet" <dada1@...mosbay.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: NET_SCHED cbq dropping too many packets on a bonding interface



--------------------------------------------------
From: "Jarek Poplawski" <jarkao2@...il.com>
Sent: Friday, May 16, 2008 4:16 AM
To: "Patrick McHardy" <kaber@...sh.net>
Cc: "Kingsley Foreman" <kingsley@...ernode.com.au>; "Eric Dumazet" 
<dada1@...mosbay.com>; "Andrew Morton" <akpm@...ux-foundation.org>; 
<linux-kernel@...r.kernel.org>; <netdev@...r.kernel.org>
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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