[dpdk-dev] drops while transmitting to the kni using rte_kni_tx_burst()

[Shirley Avishour]

Hi,
As I wrote the kernel thread runs on a dedicated lcore.
running top while my application is running I see kni_single and the cpu
usage is really low...
Is there any rate limitation for transmitting to the kernel interface
(since packets are being copied in the kernel).


On Mon, Jan 16, 2017 at 4:42 PM, Ferruh Yigit <ferruh.yigit at intel.com>
wrote:

> On 1/16/2017 12:20 PM, Shirley Avishour wrote:
> > Hi,
> > I have an application over dpdk which is consisted of the following
> threads
> > each running on a separate core:
> > 1) rx thread which listens on in a poll mode for traffic
> > 2) 2 packet processing threads (for load balancing)
> > 3) kni thread (which also runs on a separate core).
>
> This is kernel thread, right? Is it bind to any specific core?
> Is it possible that this thread shares the core with 2nd processing
> thread when enabled?
>
> >
> > the rx thread receives packets and clones them and transmit a copy to the
> > kni and the other packet is sent to the packet processing unit (hashing
> > over 2 threads).
> > the receive traffic rate is 100Mbps.
> > When working with single packet processing thread I am able to get all
> the
> > 100Mbps towards the kni with no drops.
> > but when I activate my application with 2 packet processing threads I
> start
> > facing drops towards the kni.
> > the way I see it the only difference now is that I have another threads
> > which handles an mbuf and frees it once processing is completed.
> > Can anyone assist with this case please?
> >
> > Thanks!
> >
>
>