> -----Original Message----- > From: Richardson, Bruce <bruce.richard...@intel.com> > Sent: 2022年2月18日 17:42 > To: Ma, WenwuX <wenwux...@intel.com> > Cc: Burakov, Anatoly <anatoly.bura...@intel.com>; dev@dpdk.org; Hu, > Jiayu <jiayu...@intel.com>; Wang, Yinan <yinan.w...@intel.com>; He, > Xingguang <xingguang...@intel.com> > Subject: Re: [PATCH] examples/multi_process: add options to control port > configuration > > On Fri, Feb 18, 2022 at 06:49:19AM +0000, Ma, WenwuX wrote: > > > > > > > -----Original Message----- > > > From: Richardson, Bruce <bruce.richard...@intel.com> > > > Sent: 2022年2月17日 17:06 > > > To: Ma, WenwuX <wenwux...@intel.com> > > > Cc: Burakov, Anatoly <anatoly.bura...@intel.com>; dev@dpdk.org; Hu, > > > Jiayu <jiayu...@intel.com>; Wang, Yinan <yinan.w...@intel.com>; He, > > > Xingguang <xingguang...@intel.com> > > > Subject: Re: [PATCH] examples/multi_process: add options to control > > > port configuration > > > > > > On Thu, Feb 17, 2022 at 03:17:55PM +0000, Wenwu Ma wrote: > > > > The default values of rx mq_mode and rx offloads for port will > > > > cause symmetric_mp startup failure if the port do not support rss or > csum. > > > > Therefore, we added two new options --rx-mq-mode and > > > > --rx-offloads, through which the user can set the values > > > > appropriately according to the situation to make app startup normally. > > > > > > > > Signed-off-by: Wenwu Ma <wenwux...@intel.com> --- > > > > > > The idea seems reasonable enough, but I think the implementation > > > requiring the user to pass in special "magic numbers" for the > > > offload values is not a good idea. Perhaps add in a separate flag for "no- > csum" to disable that. > > > > > > For the no-rss case, can you explain how you would see this app > > > being used in the absense of RSS support to distribute traffic among > > > the separate processes? > > > > When app run in qemu vm and the backend is dpdk vhost, it will report > error below: > > "virtio_dev_configure(): RSS support requested but not supported by the > device" > > Sure, I understand that. But how does it make sense to run multiple copies of > the app if RSS cannot be used to spread the traffic between the instances?
in test case, vhost backend has 2 queues, and we set fwd as txonly, and in vm, we run app as follows ./examples/multi_process/symmetric_mp/build/symmetric_mp -l 1 -n 4 --proc-type=auto -- -p 3 --num-procs=2 --proc-id=0 ./examples/multi_process/symmetric_mp/build/symmetric_mp -l 2 -n 4 --proc-type=secondary -- -p 3 --num-procs=2 --proc-id=1 So, instance 0 receive pkts in queue 0, and instance 1 receive pkts in queue 1.
