RE: hfsc and dropped packets

Linux Advanced Routing and Traffic Control

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Thanks for the reply!  Setting the tx_queue_len fixed the drops which got
rid of the studder in voip! Thanks. 

-----Original Message-----
From: Patrick McHardy [mailto:kaber@xxxxxxxxx] 
Sent: Monday, March 13, 2006 6:03 PM
To: James Nelson
Cc: lartc@xxxxxxxxxxxxxxx
Subject: Re:  hfsc and dropped packets

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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