Hi! I am working with 3 priority queues on simple_switch, and I am trying to collect I

Thank you <a class="user-mention notranslate" data-hovercard-type="user" data-hovercar

Queue metadata with multiqueue about behavioral-model HOT 2 OPEN

carlos-hfm commented on August 20, 2024

Queue metadata with multiqueue

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Comments (2)

antoninbas commented on August 20, 2024

Yes, in the simple_switch implementation it seems that the qdepth is measured across all priority queues for a given port:

behavioral-model/targets/simple_switch/simple_switch.cpp

Lines 411 to 412 in a8e2947

 phv->get_field("queueing_metadata.enq_qdepth") 

 .set(egress_buffers.size(egress_port));

behavioral-model/include/bm/bm_sim/queueing.h

Lines 616 to 635 in a8e2947

 //! The occupancies of all the priority queues for this logical queue are 

 //! added. 

 size_t size(size_t queue_id) const { 

 LockType lock(mutex); 

 auto it = queues_info.find(queue_id); 

 if (it == queues_info.end()) return 0; 

 auto &q_info = it->second; 

 return q_info.size; 

 } 

 //! Get the occupancy of priority queue \p priority for logical queue with id 

 //! \p queue_id. 

 size_t size(size_t queue_id, size_t priority) const { 

 LockType lock(mutex); 

 auto it = queues_info.find(queue_id); 

 if (it == queues_info.end()) return 0; 

 auto &q_info = it->second; 

 auto &q_info_pri = q_info.at(priority); 

 return q_info_pri.size; 

 }

Notice how the first variant is called by simple_switch

from behavioral-model.

carlos-hfm commented on August 20, 2024

Thank you @antoninbas. I changed the simple_switch.cpp code to use the second size method variant and recompiled bmv2. It seems that now I can get the depth of only specific priority queues using the enq_qdepth metadata.

But it is strange to me that the standard behavior implemented is to return the depth of all priority queues of the egress port together, instead of the specific queue that the packet is crossing.

from behavioral-model.

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Queue metadata with multiqueue about behavioral-model HOT 2 OPEN

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	phv->get_field("queueing_metadata.enq_qdepth")
	.set(egress_buffers.size(egress_port));

	//! The occupancies of all the priority queues for this logical queue are
	//! added.
	size_t size(size_t queue_id) const {
	LockType lock(mutex);
	auto it = queues_info.find(queue_id);
	if (it == queues_info.end()) return 0;
	auto &q_info = it->second;
	return q_info.size;
	}

	//! Get the occupancy of priority queue \p priority for logical queue with id
	//! \p queue_id.
	size_t size(size_t queue_id, size_t priority) const {
	LockType lock(mutex);
	auto it = queues_info.find(queue_id);
	if (it == queues_info.end()) return 0;
	auto &q_info = it->second;
	auto &q_info_pri = q_info.at(priority);
	return q_info_pri.size;
	}