Re: [dpdk-users] Packet drop when using KNI sample application

[Andriy Berestovskyy <aber@semihalf.com>]

Hey Amit,
Regarding the pings. Try to set the same MAC on vEth as you have on
eth0 prior the unbind, i.e.:

# ifconfig vEth hw ether <eth0 MAC>


Regarding the logs. There are compile-time options to enable debugs in
PMDs. Please see config/common_base file for the complete list.

Not sure which driver you use, but for virtio-net you could try to
enable *_VIRTIO_DEBUG_RX/TX and then recompile the DPDK and the KNI
example.

Regards,
Andriy

On Mon, Sep 19, 2016 at 9:59 AM, Amit Sharma <amit.sh1094@gmail.com> wrote:
> Hi,
>
> While running the DPDK KNI sample application, we are facing packet drop
> after some time.
>
> *Setup:-*
> 1. 2 VMs configured using Ubuntu 14.04
> 2. eth0 of both VMs connected to each other, and able to ping
>
> *DPDK related setup:-*
> 1. 1st VM eth0 is bound with DPDK driver[bind=uio_pci_generic]
> 2. Insert the KNI module in Linux kernel[insmod rte_kni.ko].
> 3. Start the KNI application [*./build/kni -c 0x3 -n 4 -- -P -p 0x1
> --config="(0,0,1)"*].
> 4. Assign the ip address to vEth0 [*ifconfig vEth0 10.0.1.2*]
> 5. start the tcpdump on vEth0
> 6. From 2nd VM try to ping 8.8.8.8
>
> *Issue:- *
> ping works fine for around 400-500 packets(we reserved 2000 2MB hugepages).
> after that ping packet is never sent back to VM2
> on further investigation we found *rte_eth_tx_burst *always returns 0 when
> the problem occurs
> we are investigating it further, But before that any help is welcome
>
>
> on the side note, we have another issue with log levels, to investigate the
> above issue we were trying to enable the logs for PMD
> using the following code
>
> rte_set_log_type(RTE_LOGTYPE_PMD, 1);
>
> rte_set_log_level(RTE_LOG_DEBUG);
>
> during initialization we see some logs from PMD, But after that no logs
> during receive and transmission of packets, any idea why is that?
>
> Thanks
> Amit Sharma



-- 
Andriy Berestovskyy