[dpdk-dev] Random packet drops with ip_pipeline on R730.

Dumitrescu, Cristian cristian.dumitrescu at intel.com
Tue Sep 8 15:02:52 CEST 2015


Hi Husainee,

Can you please explain what do you mean by random packet drops? What percentage of the input packets get dropped, does it take place on every run, does the number of dropped packets vary on every run, etc?

Are you also able to reproduce this issue with other NICs, e.g. 10GbE NIC?

Can you share your config file?

Can you please double check the low level NIC settings between the two applications, i.e. the settings in structures link_params_default, default_hwq_in_params, default_hwq_out_params from ip_pipeline file config_parse.c vs. their equivalents from l2fwd? The only thing I can think of right now is maybe one of the low level threshold values for the Ethernet link is not tuned for your 1GbE NIC.

Regards,
Cristian

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of husainee
> Sent: Tuesday, September 8, 2015 7:56 AM
> To: dev at dpdk.org
> Subject: [dpdk-dev] Random packet drops with ip_pipeline on R730.
> 
> Hi
> 
> I am using a DELL730 with Dual socket. Processor in each socket is
> Intel(R) Xeon(R) CPU E5-2603 v3 @ 1.60GHz- 6Cores.
> The CPU layout has socket 0 with 0,2,4,6,8,10 cores and socket 1 with
> 1,3,5,7,9,11 cores.
> The NIC card is i350.
> 
> The Cores 2-11 are isolated using isolcpus kernel parameter. We are
> running the ip_peipeline application with only Master, RX and TX threads
> (Flow and Route have been removed from cfg file). The threads are run as
> follows
> 
> - Master on CPU core 2
> - RX on CPU core 4
> - TX on CPU core 6
> 
> 64 byte packets are sent from ixia at different speeds, but we are
> seeing random packet drops.  Same excercise is done on core 3,5,7 and
> results are same.
> 
> We tried the l2fwd app and it works fine with no packet drops.
> 
> Hugepages per 1024 x 2M per socket.
> 
> 
> Can anyone suggest what could be the reason for these random packet
> drops.
> 
> regards
> husainee
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 



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