On Thu, 26 Sep 2019 10:45:03 +0530 Gaurav Bansal <[email protected]> wrote:
> any suggestions here ? > > On Wed, Sep 25, 2019 at 4:09 PM Gaurav Bansal <[email protected]> wrote: > > > Hi all, > > I am using dpdk 16.04 library to process the packets on a vmware vm (say > > vm1). The traffic is sent through a client machine using apache bench. I am > > observing an issue when the number of packets reaching the vmxnet3 > > interface reaches the descriptor ring size (set to 2048). Till 2048 all the > > packets correctly reach the 'vmxnet3_recv_pkts' function. > > > > But as the number of packets received reaches 2048, i start seeing some > > retransmissions on the client side (as shown by tcpdump on client side). > > Then i captured the packets on the esx host destined to vm1 and it shows > > that all the original packets as well as the corresponding retransmissions > > are reaching vm1. But somehow these packets fail to reach till > > 'vmxnet3_recv_pkts' function (this was found by putting the breakpoint in > > 'vmxnet3_recv_pkts' function and dumping the packet contents, which showed > > that some packets don't reach here). > > > > Now 'vmxnet3_recv_pkts' is the first function which reads the packets from > > the descriptor ring and as the packets are not reaching till here, i am not > > sure on how to debug this further. Possibly some issues related to the ring > > initialization.... I enabled the init & RX logs for vmxnet3, but i don't > > see any error logs as well. I also tried looking at rxq stats and it shows > > 0 all the time : > > (gdb) p rxq->stats > > $1 = {drop_total = 0, drop_err = 0, drop_fcs = 0, rx_buf_alloc_failure = 0} > > > > Can anyone please provide some clues on how to debug this further ? Are > > there any known issues related to this which have been fixed post 16.04 > > version ? > > thanks, > > gaurav > > Try a newer version of DPDK first.
