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

[husainee]

hi Cristian

I am using 2.0 release. I will try with 2.1 and revert.

But for additional information I tried the same 2.0 ip_pipeline
application with a Desktop system which has a single socket  Intel(R)
Core(TM) i5-4440 CPU @ 3.10GHz, 4 core. The nic is same i350.

On this machine I am sending packets on 4 ports at 1Gbps full duplex and
i get 4Gbps throughput with no drops.

The change between the two systems is the processor (speed, cores) and
no of sockets. Is the speed of processor reducing the performance of
DPDK drastically from 4Gbps to something <0.5Gpbs. This is confusing!

regards
husainee


On 09/09/2015 05:09 PM, Dumitrescu, Cristian wrote:
>
> Hi Husainee,
>
>  
>
> Looking at your config file, looks like you are using an old DPDK
> release prior to 2.1, can you please try out same simple test in your
> environment for latest DPDK 2.1 release?
>
>  
>
> We did a lot of work in DPDK release 2.1 for the ip_pipeline
> application, we basically rewrote large parts of it, including the
> parser, checks, run-time, library of pipelines, etc. The format of the
> config file has been improved a lot, you should be able to adapt your
> config file to the latest syntax very quickly.
>
>  
>
> Btw, you config file is not really equivalent to the l2fwd, as you are
> using two CPU cores connected through software rings rather than a
> single core, as l2fwd.
>
>  
>
> Here is an equivalent DPDK 2.1 config file using two cores connected
> through software rings (port 0 -> port 1, port 1-> port 0, port 2 ->
> port 3, port 3 -> port2):
>
>  
>
> [PIPELINE0]
>
> type = MASTER
>
> core = 0
>
>  
>
> [PIPELINE1]
>
> type = PASS-THROUGH
>
> core = 1
>
> pktq_in = RXQ0.0 RXQ1.0 RXQ2.0 RXQ3.0
>
> pktq_out = SWQ0 SWQ1 SWQ2 SWQ3
>
>  
>
> [PIPELINE2]
>
> type = PASS-THROUGH
>
> core = 2; you can also place PIPELINE2 on same core as PIPELINE1: core = 1
>
> pktq_in = SWQ1 SWQ0 SWQ3 SWQ2
>
> pktq_out = TXQ0.0 TXQ1.0 TXQ2.0 TXQ3.0
>
>  
>
> Here is an config file doing similar processing with a single core,
> closer configuration to l2fwd (port 0 -> port 1, port 1-> port 0, port
> 2 -> port 3, port 3 -> port2):
>
>  
>
> [PIPELINE0]
>
> type = MASTER
>
> core = 0
>
>  
>
> [PIPELINE1]
>
> type = PASS-THROUGH
>
> core = 1
>
> pktq_in = RXQ0.0 RXQ1.0 RXQ2.0 RXQ3.0
>
> pktq_out = TXQ1.0 TXQ0.0 TXQ3.0 TXQ2.0
>
>  
>
> Regards,
>
> Cristian
>
>  
>
> *From:*husainee [mailto:husainee.plumber at nevisnetworks.com]
> *Sent:* Wednesday, September 9, 2015 12:47 PM
> *To:* Dumitrescu, Cristian; dev at dpdk.org
> *Cc:* Cao, Waterman
> *Subject:* Re: [dpdk-dev] Random packet drops with ip_pipeline on R730.
>
>  
>
> Hi Cristian
> PFA the config file.
>
> I am sending packets from port0 and receiving on port1.
>
> By random packet drops I mean, on every run the number of packets
> dropped is not same. Here are some results as below.
>
> Frame sent rate 1488095.2 fps, 64Byte packets (100% of 1000Mbps)
> Run1- 0.0098% (20-22 Million Packets)
> Run2- 0.021% (20-22 Million Packets)
> Run3- 0.0091% (20-22 Million Packets)
>
> Frame rate 744047.62 fps, 64 Byte packets, (50% of 1000Mbps)
> Run1- 0.0047% (20-22 Million Packets)
> Run2- 0.0040% (20-22 Million Packets)
> Run3- 0.0040% (20-22 Million Packets)
>
>
> Frame rate 148809.52 fps, 64 Byte packets,(10% of 1000Mbps)
> Run1- 0 (20-22 Million Packets)
> Run2- 0 (20-22 Million Packets)
> Run3- 0 (20-22 Million Packets)
>
>
>
> Following are the hw nic setting differences btw ip_pipeline and l2fwd
> app.
>
> parameter
>
> 	
>
> ip_pipeline
>
> 	
>
> l2fwd
>
> jumbo frame
>
> 	
>
> 1
>
> 	
>
> 0
>
> hw_ip_checksum
>
> 	
>
> 1
>
> 	
>
> 0
>
> rx_conf. wthresh
>
> 	
>
> 4
>
> 	
>
> 0
>
> rx_conf.rx_free_thresh
>
> 	
>
> 64
>
> 	
>
> 32
>
> tx_conf.pthresh
>
> 	
>
> 36
>
> 	
>
> 32
>
> burst size
>
> 	
>
> 64
>
> 	
>
> 32
>
>
> We tried to make the ip_pipeline settings same as l2fwd but no change
> in results.
>
> I have not tried with 10GbE . I do not have 10GbE test equipment.
>
>
>
> regards
> husainee
>
>
>
> On 09/08/2015 06:32 PM, Dumitrescu, Cristian wrote:
>
>     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 <mailto: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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