topic Re: A few questions about ipmctl in Intel® Optane™ Persistent Memory

A few questions about ipmctl

tbch — Thu, 05 Dec 2019 23:39:06 GMT

Hi there,

In the command "ipmctl show -performance", there are many counters recording the amount of reads and writes on the DCPMMs.

The counters keep increasing even though I do not issue any read or write to the DCPMMs between two commands as the figure below shows.

Moreover, if the duration of two commands are longer, the counter will increase more.

Is this a normal situation?

By the way, the DCPMMs are configured as AppDirectNotInterleaved.

Thanks!

Re: A few questions about ipmctl

JoseH_Intel — Fri, 06 Dec 2019 13:05:12 GMT

Hello 3000023211241.5682127566329841E12,

Thank you for joining the community

Do you have any application or job running in the background while executing this pmctl show -performance command?

We will investigate further about this issue. Will get back to you as soon as we have updates.

Regards

Jose A.

Intel Customer Support Technician

A Contingent Worker at Intel

Re: A few questions about ipmctl

tbch — Fri, 06 Dec 2019 15:47:40 GMT

Hi Jose,

There's no other application running except for the ipmctl command.

Re: A few questions about ipmctl

JoseH_Intel — Mon, 09 Dec 2019 08:37:31 GMT

Hello 3000023211241.5682127566329841E12,

We need to gather the following logs in order to elevate this issue to our engineering team:

1. collect initial "ipmctl show -performance"

2. 30 sec idle state (not using DCPMM)

3. collect final "ipmctl show -performance"

We will look forward for your updates.

Jose A.

Intel Customer Support Technician

A Contingent Worker at Intel

Re: A few questions about ipmctl

tbch — Mon, 09 Dec 2019 14:13:43 GMT

Hello Jose,

The figure below is the log.

Re: A few questions about ipmctl

JoseH_Intel — Tue, 10 Dec 2019 12:56:34 GMT

Hello 3000023211241.5682127566329841E12,

Thanks for the log provided. I will proceed to engage our engineering team and will let you know as soon as we have updates from them

Regards

Jose A.

Intel Customer Support Technician

A Contingent Worker at Intel

Re: A few questions about ipmctl

JoseH_Intel — Wed, 18 Dec 2019 10:09:16 GMT

Hello 3000023211241.5682127566329841E12,

This behavior is expected.

The media reads and media writes are between the DCPMM controller and Optane media.

There are firmware processes there that are constantly running for checking media integrity, updating internal housekeeping info, etc. These processes run even when there is no activity between the host and the DCPMM.

The Read Requests and Write Requests are between the host and the DCPMM.

Assuming there were no other CLI commands run, and there was not an agent running to check for DCPMM event logs, those counts are probably from asking for performance info, and the actual data that was returned.

Hope it helps.

Jose A.

Intel Customer Support Technician

A Contingent Worker at Intel

Re: A few questions about ipmctl

tbch — Wed, 18 Dec 2019 10:53:27 GMT

Hello Jose,

Thanks for the help!