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New Member

WFQ dynamic queues question

Hi everybody,

Can anybody tell me what happens if WFQ runs out of queues on an interface? Let's say you have 64 queues setup on an interface and there are 100 flows? How does WFQ deal with this?

Thanks

Mike

1 ACCEPTED SOLUTION

Accepted Solutions

Re: WFQ dynamic queues question

Hi,

A flow is sorted into an existing queue because of a hash value calculated from the header. The hashing algorithm is selecting one existing queue, so it will never "run out of queues". If 100 flows and only 64 queues exist, then many flows end up with other flows in the same queue.

Therefore it is recommended to configure the number of dynamic queues much higher than the number of concurrent flows.

Regards, Martin

2 REPLIES

Re: WFQ dynamic queues question

Hi,

A flow is sorted into an existing queue because of a hash value calculated from the header. The hashing algorithm is selecting one existing queue, so it will never "run out of queues". If 100 flows and only 64 queues exist, then many flows end up with other flows in the same queue.

Therefore it is recommended to configure the number of dynamic queues much higher than the number of concurrent flows.

Regards, Martin

New Member

Re: WFQ dynamic queues question

Awesome. That explains it and makes perfect sense. Thanks very much for clearing that up for me.

Mike

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