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From: Patrick McHardy <kaber@trash.net>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] hfsc and dropped packets
Date: Tue, 14 Mar 2006 00:03:24 +0000	[thread overview]
Message-ID: <4416084C.5080902@trash.net> (raw)
In-Reply-To: <086101c646eb$5e4ab110$1414a8c0@provsol.int>

Patrick McHardy wrote:
> James Nelson wrote:
> 
>>root@jmnrouter:/jmn# tc  class show dev vlan1
>> [...]
>>
>>Why is there dropped packets but nothing overlimits??
> 
> 
> Overlimits counts dequeue-attempts that were unsuccessful because of
> qdisc limits. Drops usually occur when the inner qdisc is full during
> enqueue, so they have quite opposite meanings.

BTW, in your case the drops most likely occur because HFSC's default
pfifo child qdiscs use the tx_queue_len of the device as their limit,
which in case of vlan devices is zero (in that case 1 is used).

So you can either increase the tx_queue_len of the vlan device
or manually add child qdiscs with bigger limits.
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  parent reply	other threads:[~2006-03-14  0:03 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-03-13 22:13 [LARTC] hfsc and dropped packets James Nelson
2006-03-13 23:53 ` Patrick McHardy
2006-03-14  0:03 ` Patrick McHardy [this message]
2006-03-14  0:39 ` James Nelson

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