[dpdk-dev] Running independent processes on the same machine

[Richardson, Bruce]

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Kai Zhang
> Sent: Sunday, July 20, 2014 11:04 AM
> To: dev at dpdk.org
> Subject: [dpdk-dev] Running independent processes on the same machine
> 
> Hello,
> 
> I have been trying to measure the round trip latency with two machines,
> A->B->A. I modified l2fwd as two new apps: rx and tx, where tx sends
> packets and embeds time stamp, rx receives packets and calculate the round
> trip latency.
> The source code are as follows:
> https://github.com/kay21s/dpdk/tree/master/examples/rx
> https://github.com/kay21s/dpdk/tree/master/examples/tx
> 
> Both of rx and tx run correctly if only one app is running. However, when I
> am trying to run rx and tx simultaneously on machine A, rx cannot receive
> any packets.
> The commands I used are
> 
> 
> sudo ./build/tx -c 0x2 -n 1 --file-prefix p2 -m 64 -- -q 1 -p 1
> sudo ./build/rx -c 0x1 -n 1 --file-prefix p1 -m 64 -- -q 1 -p 1
> 
> Thanks for your help,
> Kai

Hi Kai,

Two independent processes on the same machine cannot share Ethernet ports as each will reconfigure the ports for its own use when it runs. To run independent processes, you need to assign unique ports to each one and blacklist the ports being used by any other processes so that the new process doesn't reset those ports and stop the other processes from working.

Regards,
/Bruce