Re: hfsc and dropped packets

Linux Advanced Routing and Traffic Control

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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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