Why is that the performance of bigger frame can't achieve line rate while using DPDK

[idata]

Hi all,

We have a platform like this:

CPU: Intel Xeon E3-1275v3 @3.5Ghz

DRAM: Samsung DDR3 4G * 2

OS: RHEL 6.4 x64

NIC: XL710

Lan driver: i40e-1.4.25

We used this platform to run smarbit RFC2544 testing with 'testpmd' of DPDK, and got this result:

And here is a result that didn't run with DPDK.

My question is,

Why does the performance/throughput can not to achieve line rate (100%) while using DPDK

I talk about bigger frame, such as 1280B、1518B.

btw, we using DPDK 2.2.0 and the testing command is:

./testpmd -c 0x3c -n 4 -- -i --nb-cores=4 --portmask=0xf

PS.

We did not put a acceptable frame loss in our smartbit setting, just 0%.

and we checked details of the smartbit test report, there is few frame loss (~0.001%) while running with 100% loading, like below:

Thanks and regards,

Leo

[CarlosAM_INTEL]

Hello Leo_Yeh,

Thank you for contacting the Intel Embedded Community.

The first and third image of your previous communication show us the following advice:

Could you please re-post them?

By the way, could you please let us know the Smarbit RFC2544 version related to this condition? Please try to reproduce this situation with the version 1.0 or greater and let us know the results.

Thanks in advance for your cooperation.

Best Regards,

Carlos_A.

[idata]

Hi Carlos_A,

I did a re-edit, please check it out.

And, I don't understand what you mean "Smarbit RFC2544 version", where can I find it?

you mean firmware version of Smartbit?

Thanks and regards,

Leo

[CarlosAM_INTEL]

Hello Leo_Yeh,

Thanks for your reply.

Correct, we refer to the Smarbit.

Please give us the requested information.

Thanks again for your collaboration.

Best Regards,

Carlos_A.

[idata]

Hi Carlos_A,

The version of Smartbit is 4.56

Thanks and regards.

Leo,

[CarlosAM_INTEL]

Hello Leo_Yeh,

Thanks for you reply.

Please review as a reference the forum http://dpdk.org/ml/archives/dev/2015-March/016043.html [dpdk-dev] issues with packets bigger than 1500 bytes.

By the way, it is important to let you know that in order to help you with your DPDK questions, they should be addressed to the channels listed at the http://dpdk.org/ml DPDK Mailing Lists.

We hope that this information is useful to you.

Best Regards,

Carlos_A.

[idata]

Hi Carlos_A,

Thanks a lot.

I will register there.

Thanks and regards.

Leo,