On Tue, 30 Aug 2016 17:00:32 -0700 Tom Herbert <t...@herbertland.com> wrote:
> Add two fields to netdev_queue as head_cnt and tail_cnt. head_cnt is > incremented for every sent packet in netdev_tx_sent_queue and tail_cnt > is incremented by the number of packets in netdev_tx_completed_queue. > So then the number of inflight packets for a queue is simply > queue->head_cnt - queue->tail_cnt. > > Add inflight_pkts to be reported in sys-fs. I like the idea of BQL tracking inflight packets, because we could use this to determine _when_ qdisc bulking could be beneficial (activating xmit_more). Idea from NetDev1.1 slides[1] page 17, and experiment with BQL byte_queue_limits/limit_max on page 18 (which would really need a pkt count not a byte count) [1] http://people.netfilter.org/hawk/presentations/NetDev1.1_2016/net_performance_BoF.pdf [2] http://people.netfilter.org/hawk/presentations/NetDev1.1_2016/links.html -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat Author of http://www.iptv-analyzer.org LinkedIn: http://www.linkedin.com/in/brouer
