hi,
I'm testing dpdk on ubuntu 14, it's quite easy to try dpdk with tools/setup.sh now. but i am confusing that there is always TX-dropped when test with testpmd, i changed the burst num from 32 to 8, but still lots of TX-dropped happened. so anyone can share some ideas ? why so many TX-dropped ? Details: Enviroment: Linux ubuntu14319 3.19.0-25-generic #26~14.04.1-Ubuntu SMP Fri Jul 24 21:16:20 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux gcc version 4.8.5 (Ubuntu 4.8.5-2ubuntu1~14.04.1) CPU: 2*6 cores root at ubuntu14319:~/dpdk16/x86_64-native-linuxapp-gcc/app# cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 63 model name : Intel(R) Xeon(R) CPU E5-2603 v3 @ 1.60GHz stepping : 2 microcode : 0x36 cpu MHz : 1599.998 cache size : 15360 KB physical id : 0 siblings : 6 core id : 0 cpu cores : 6 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 15 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx hypervisor lahf_lm arat epb pln pts dtherm bugs : bogomips : 3199.99 clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual power management: NIC binding: Network devices using DPDK-compatible driver ============================================ 0000:02:01.0 '82545EM Gigabit Ethernet Controller (Copper)' drv=igb_uio unused= 0000:02:02.0 '82545EM Gigabit Ethernet Controller (Copper)' drv=igb_uio unused= Network devices using kernel driver =================================== 0000:03:00.0 'VMXNET3 Ethernet Controller' if=eth0 drv=vmxnet3 unused=igb_uio *Active* Other network devices ===================== testpmd: testpmd> start io packet forwarding - CRC stripping disabled - packets/burst=32 nb forwarding cores=1 - nb forwarding ports=2 RX queues=1 - RX desc=128 - RX free threshold=0 RX threshold registers: pthresh=0 hthresh=0 wthresh=0 TX queues=1 - TX desc=512 - TX free threshold=0 TX threshold registers: pthresh=0 hthresh=0 wthresh=0 TX RS bit threshold=0 - TXQ flags=0x0 testpmd> stop Telling cores to stop... Waiting for lcores to finish... ---------------------- Forward statistics for port 0 ---------------------- RX-packets: 1977364 RX-dropped: 0 RX-total: 1977364 TX-packets: 1852639 TX-dropped: 113346 TX-total: 1965985 ---------------------------------------------------------------------------- ---------------------- Forward statistics for port 1 ---------------------- RX-packets: 1966151 RX-dropped: 0 RX-total: 1966151 TX-packets: 1864575 TX-dropped: 112789 TX-total: 1977364 ---------------------------------------------------------------------------- +++++++++++++++ Accumulated forward statistics for all ports+++++++++++++++ RX-packets: 3943515 RX-dropped: 0 RX-total: 3943515 TX-packets: 3717214 TX-dropped: 226135 TX-total: 3943349 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
