topic Re: which register contains of the fields of the prefetch threshold, host threshold and write-back threshold of both rx and tx of XL710? in Ethernet Products

which register contains of the fields of the prefetch threshold, host threshold and write-back threshold of both rx and tx of XL710?

wyf — Mon, 15 Jul 2019 13:49:00 GMT

In the i350 ethernet datasheet, the RXDCTL and TXDCTL registers define the fields of the pthreshold, hthreshold and wthreshold. But i can't find the similar fields in the XL710's datasheet. Can you help me?

Re: which register contains of the fields of the prefetch threshold, host threshold and write-back threshold of both rx and tx of XL710?

Mike_Intel — Tue, 16 Jul 2019 13:20:20 GMT

Hello wyf,

Thank you for posting in Intel Ethernet Communities.

Before we proceed, let me gather the following details.

May I know why you need this information?
What are you trying to configure or set?
What is your OS?

If you have questions, please let us know.

Best regards,

Michael L.

Intel Customer Support Technicians

A Contingent Worker at Intel

Re: which register contains of the fields of the prefetch threshold, host threshold and write-back threshold of both rx and tx of XL710?

Mike_Intel — Fri, 19 Jul 2019 07:35:39 GMT

Hello wyf,

Just want to make a follow up on the following information for me to further assist you.

May I know why you need this information?
What are you trying to configure or set?
What is your OS?

If you have questions, please let us know.

Best regards,

Michael L.

Intel Customer Support Technicians

A Contingent Worker at Intel

Re: which register contains of the fields of the prefetch threshold, host threshold and write-back threshold of both rx and tx of XL710?

wyf — Fri, 19 Jul 2019 08:50:56 GMT

Hi Micheal L,

I want to tune the XL710 dpdk performance on my platform.

Comparison with I350 dpdk driver, i find the dpdk driver has achieved the rxpt/rxht/rxwt parameters to write the actual register RXDCT. But In XL710 i40e dpdk driver, I can't find it manuplicated the related registers anywhere. So i want to attemp to code this function .

I want to tune the XL710 prefech descriptors and write-back descriptors， so i need to know which registers contained the rxpt/rxht/rxwt fields in XL710's datasheet.

Additional, I do this in Ubuntu 16.04.

Best Regards!

Thanks very much.

Re: which register contains of the fields of the prefetch threshold, host threshold and write-back threshold of both rx and tx of XL710?

Mike_Intel — Fri, 19 Jul 2019 12:44:17 GMT

Hello wyf,

Are you designing a system and trying to embed XL710 into that system?

If you have questions, please let us know.

Best regards,

Michael L.

Intel Customer Support Technicians

A Contingent Worker at Intel

Re: which register contains of the fields of the prefetch threshold, host threshold and write-back threshold of both rx and tx of XL710?

wyf — Fri, 19 Jul 2019 12:57:43 GMT

Hi Michael L,

I just plug XL710 into my system, no embeding it.

When i use dpdk, i find the available registers about prefetch threshold and write-back threshold of I350 ethernet card. I suppose whether there is the similar registers for XL710. I think there is adjusted space for tuning performance. So I just want to try.

Best regards,

Thanks.

Re: which register contains of the fields of the prefetch threshold, host threshold and write-back threshold of both rx and tx of XL710?

Mike_Intel — Fri, 19 Jul 2019 13:15:51 GMT

Hello wyf,

Can you provide the steps that you did and what are the options that you can see there?

If you have questions, please let us know.

Best regards,

Michael L.

Intel Customer Support Technicians

A Contingent Worker at Intel

Re: which register contains of the fields of the prefetch threshold, host threshold and write-back threshold of both rx and tx of XL710?

Mike_Intel — Wed, 24 Jul 2019 07:50:54 GMT

Hello wyf,

I just want to ask for the steps again and the options that you choose.

If you have questions, please let us know.

Best regards,

Michael L.

Intel Customer Support Technicians

A Contingent Worker at Intel

Re: which register contains of the fields of the prefetch threshold, host threshold and write-back threshold of both rx and tx of XL710?

wyf — Wed, 24 Jul 2019 10:33:22 GMT

i use dpdk with the options like "./testpmd -c 0xff -- -i --rxpt=32 --rxht=32 --rxwt=32 --txpt=32 --txht=32 ", but i read the i40e's driver codes, i can't find where it does set the options.

Re: which register contains of the fields of the prefetch threshold, host threshold and write-back threshold of both rx and tx of XL710?

Mike_Intel — Wed, 24 Jul 2019 11:09:24 GMT

Hello wyf,

Can you provide pictures of the NIC on both sides of the card for us to check if this NIC is a retail Intel NIC?

If you have questions, please let us know.

Best regards,

Michael L.

Intel Customer Support Technicians

A Contingent Worker at Intel

Re: which register contains of the fields of the prefetch threshold, host threshold and write-back threshold of both rx and tx of XL710?

Mike_Intel — Mon, 29 Jul 2019 07:18:02 GMT

Hello wyf,

Just making a follow up on the markings of the NIC for me to further check this issue.

If you have questions, please let us know.

Best regards,

Michael L.

Intel Customer Support Technicians

A Contingent Worker at Intel

Re: which register contains of the fields of the prefetch threshold, host threshold and write-back threshold of both rx and tx of XL710?

Mike_Intel — Thu, 01 Aug 2019 07:23:22 GMT

Hello wyf,

Sending another follow up on the markings of the NIC.

If you have questions, please let us know.

Best regards,

Michael L.

Intel Customer Support Technicians

A Contingent Worker at Intel