Re: [dpdk-dev] [PATCH v5] app/testpmd: add option ring-bind-lcpu to bind Q with CPU

[Simon Guo <wei.guo.simon@gmail.com>]

Hi, Konstantin,
On Tue, Jan 16, 2018 at 12:38:35PM +0000, Ananyev, Konstantin wrote:
> 
> 
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of wei.guo.simon@gmail.com
> > Sent: Saturday, January 13, 2018 2:35 AM
> > To: Lu, Wenzhuo <wenzhuo.lu@intel.com>
> > Cc: dev@dpdk.org; Thomas Monjalon <thomas@monjalon.net>; Simon Guo <wei.guo.simon@gmail.com>
> > Subject: [dpdk-dev] [PATCH v5] app/testpmd: add option ring-bind-lcpu to bind Q with CPU
> > 
> > From: Simon Guo <wei.guo.simon@gmail.com>
> > 
> > Currently the rx/tx queue is allocated from the buffer pool on socket of:
> > - port's socket if --port-numa-config specified
> > - or ring-numa-config setting per port
> > 
> > All the above will "bind" queue to single socket per port configuration.
> > But it can actually archieve better performance if one port's queue can
> > be spread across multiple NUMA nodes, and the rx/tx queue is allocated
> > per lcpu socket.
> > 
> > This patch adds a new option "--ring-bind-lcpu"(no parameter).  With
> > this, testpmd can utilize the PCI-e bus bandwidth on another NUMA
> > nodes.
> > 
> > When --port-numa-config or --ring-numa-config option is specified, this
> > --ring-bind-lcpu option will be suppressed.
> 
> Instead of introducing one more option - wouldn't it be better to 
> allow user manually to define flows and assign them to particular lcores?
> Then the user will be able to create any FWD configuration he/she likes.
> Something like:
> lcore X add flow rxq N,Y txq M,Z
> 
> Which would mean - on lcore X recv packets from port=N, rx_queue=Y,
> and send them through port=M,tx_queue=Z.
Thanks for the comment.
Will it be a too compliated solution for user since it will need to define 
specifically for each lcore? We might have hundreds of lcores in current 
modern platforms.

Thanks,
- Simon