Macushk,

Is the BIOS,and the chipset up to date?  I would verify that they are as well as the ESM and then recheck.

BIOS - http://www.dell.com/support/drivers/us/en/04/DriverDetails/Product/poweredge-r620?driverId=2052Y&osCode=WS8R2&fileId=3323714300&languageCode=en&categoryId=BI

ESM - http://www.dell.com/support/drivers/us/en/04/DriverDetails/Product/poweredge-r620?driverId=JYX4C&osCode=WS8R2&fileId=3288107913&languageCode=en&categoryId=ES

Chipset - http://www.dell.com/support/drivers/us/en/04/DriverDetails/Product/poweredge-r620?driverId=5WJX9&osCode=WS8R2&fileId=3325839075&languageCode=en&categoryId=CS

Let me know it goes.

In the doc, it said it only requires BIOS 1.4.8 and idrac 1.30.30.

We are using BIOS 2.0.19 and idrac 1.46.45 on Centos 6.2, so I think the BIOS and idrac is update.

Anyone could share some tips about it?

I have escalated this question to local DELL technical support, but they just reply this is not included in the DELL technical support.

What support is included in the DELL technical support ?

frustrated.

Any DELL engineer in this forum can help or guide me to the right right to get DELL support ???

Hello macushk

What are you having issues with?

The guide you linked is the setup guide for both the R620 and R720, so you have the instructions for enabling DPAT. You also state you have performed the steps without issue. What is wrong with the processor frequency? What issue are you having with DPAT?

DPAT is a feature that allows the iDRAC to control turbo mode to allow for lower latency. Businesses that prefer lower processor latency over raw processing will disable C states. DPAT is an alternative to disabling C states for businesses that need low latency processing.

How many cores do you have enabled?
What are you expecting to see in the processor frequencies?
What are you seeing in the processor frequencies?

Thanks

The question is how can I confirm the DPAT is effective ? For example, how can I confirm the frequency change after the DPAT setup?

I have followed the guideline to setup the DPAT, but the CPU core frequency in the BIOS and in the OS (cpu info in Linux( has nothing changed.

I have 2 R620. One is equipped with E5-2667 v2 and the other is equipped with E5-2690 Dual processors. Each processor is 8 cores

Thank you

Macushk,

The R620 and R720/720xd with the E5-2690 processors installed, support DPAT. I am not seeing the E5- 2667. Also when you are looking for the change from enabling. On the 2690 system, are you looking for a frequency change at idle, or are you loading the system to compare? I ask as the system in idle will not likely show much change.

Let us know.

One R620 server is installed with 2 x E5-2667 v2 processors.

Do you mean the core frequency will be changed (increased) when the system load increase after DPAT enabled?

Could you please share some benchmark test result? like. frequency before and after DPAT enabled, core frequency changed vs number of cpu cores.

We would like to use DPAT on our systems and thinking how we can confirm performance benefit from enabling the DPAT.

Thank you

Do you mean the core frequency will be changed (increased) when the system load increase after DPAT enabled?

No, DPAT will control turbo mode rather than allowing the operating system. DPAT sets the frequency at a certain rate based on how many cores are turned on.

1 core - 3.8
2 core - 3.6
4 core - 3.4

Could you please share some benchmark test result?

I was not able to locate any benchmarks.

What are you seeing in the frequencies in the operating system? Your frequencies should either be at idle or the preset value for the number of cores.

Thanks

We would like to use DPAT on our systems and thinking how we can confirm performance benefit from enabling the DPAT.

What type of processing will you be performing?

DPAT is mainly designed for applications like high frequency trading. In that application response time or latency plays a large role. Even more so than raw processing power. It is more beneficial to disable C states and run the processor at a lower base clock that has a faster response time than to have C states turned on and have more latency because of the state transition delays.

This is how DPAT came about:

Customers needed really fast low latency processing. They were disabling C states to achieve this and not benefiting from the full processing power of the CPU. We added the DPAT feature so that businesses could use some of the additional processing that was not being utilized.

DPAT is really good for low latency processing. DPAT is better for power efficiency than just running at the base clock, but it is not as efficient as allowing all power states to function. You should only use DPAT if you prefer low latency processing over energy efficiency.

Thanks