After upgrading from v4.17 to v5.6 we noticed that the pcq's were generating at times large numbers of subqueques. The screen shot below shows 418 subqueues in the queue ″Upload / Priority-Low-Up″. There were only a few active clients connected at the time (<10). Excessive number of subqueues only occurs in the last 2 queues. About half the time the number of subqueues is small and within the expected range. But about 30 % of the time the number of subqueues is between 40 and 200 and occasionally up to 600. The queue tree is set up such that each client should get only 1 subqueue, thereby sharing the bandwidth equally. Below are also the screen shots of the queue types ″priority-up″ and ″priority-down″.
We also upgraded a network from v4.17 to v5.6 with 100+ clients and heavy traffic. There, the upload was completely overloaded and thereby also blocking the download. We quickly had to go back to v4.17.
Any help would be appreciated.