[dpdk-users] [pktgen] pktgen Tx/Rx rates are not the same in loopback testing case

[Wiles, Keith]

> On Jul 21, 2017, at 10:11 AM, Paul Tsvika <mozloverinweb at gmail.com> wrote:
> 
> Hi developers,

Attachements at scrubbed from emails to the list, so best to add links or inline the text.

What is the core layout for your system. Can you run the cpu-layout.py tool.

> 
> Below is my hardware configuration:
> 
> Memory: 32G ( 16 G on two channels )
> CPU: Xeon-D 1557 ( 12 cores, hyperthreading - 24 core )
> NIC: Intel X552/X557 10GBASE-T
> 
> My motherboard has 2 10G ports so that I set up the testing experiment in
> loopback.
> 
> I have compiled DPDK successfully and below is the steps how I configured
> pktgen
> 
> $ sudo modprobe uio
> $ sudo insmod ./build/kmod/igb_uio.ko
> $ sudo ./usertools/dpdkdevbind.py -b igb_uio xxx:xx.0 xxx:xx.1
> $ sudo ./app/pktgen -c 0x1f -n 2 -- -P -m "[1:3].0, [2:4].1"
> <pktgen> start 0
> 
> I use core 1 and core 3 work for port 0 tx/rx respectively. Core 2 and core
> 4 work for port 1 tx/rx respectively.
> 
> I have some questions listed below:
> 
> 1.
> ​​( check my attachment d2.png )
> The TX rate is almost 10G, however, the RX rate is much lower than TX rate.
> I suppose this should not happen. Is my configuration wrong in any place ?
> I checked other developers and TX rate normally can reach 999x and RX rate
> is almost the same as TX rate.
> 
> 2.
> 
> Please check the attachment ( start_log ).
> 
> 2.1
> *Packet Burst 32, RX Desc 512, TX Desc 1024*, mbufs/port 8192, mbuf cache
> 1024
> Is 32 the default packet size ? How can I configure it to 64 ?
> Why RX Desc is different to TX Desc ?
> 
> 2,2
> *Port  0: Link Down <Enable promiscuous mode>*
> Port  1: Link Up - speed 10000 Mbps - full-duplex <Enable promiscuous mode>
> 
> Port 0 is down at some points, how can I check the root cause to this issue?
> 
> 
> 
> Thanks
> 
> -- 
> P.T
> -------------- next part --------------
> A non-text attachment was scrubbed...
> Name: d2.png
> Type: image/png
> Size: 108971 bytes
> Desc: not available
> URL: <http://dpdk.org/ml/archives/users/attachments/20170721/c22e7dbe/attachment.png>

Regards,
Keith