how to get event of UNC_DRAM_PAGE_CLOSE.CHO

[lin_w_2]

Hello,

I'm trying to get event UNC_DRAM_PAGE_CLOSE.CHO, but I always get 0. I use perf, and my OS is ubunto. My server is Intel xeon E5620.

I can get  UNC_DRAM_OPEN.CHO, But I can't get  UNC_DRAM_PAGE_CLOSE.CHO.

Do any body come across this question?

thanks a lot

lin wang

[Roman_D_Intel]

Hi Lin Wang, on the screen shot I see that only the count for raw event 0x461 is zero. Event 0x461 is UNC_DRAM_PAGE_CLOSE.CH2 and not UNC_DRAM_PAGE_CLOSE.CH0. Instead you have to use event 0x161 to monitor UNC_DRAM_PAGE_CLOSE.CH0. Best regards, Roman

[lin_w_2]

Hello Roman Dementiev, Thanks for your reply, I upload a new screen shot. I can't get 0x161,0x261,0x461,0x162,0x262,0x462. I can get dram open event, but i can't get dram page close event and dram page miss event. I don't know why？ best regards, lin wang

[McCalpinJohn]

I had no trouble reading these events on my Intel Xeon X5680 using utilities from msrtools-1.2 to read and write the uncore performance monitor MSRs. I did not think that "perf" had any provisions for accessing the MSR-based uncore counters?

[Roman_D_Intel]

Hi Lin Wang, what is the version of Linux kernel are you using? Could you post the complete command line for perf that you are using with the raw events ? Best regards, Roman

[lin_w_2]

Hello Roman Dementiev, I attach two screen shot for my linux kernel and command line. best regards. lin wang

[lin_w_2]

hello,jdmccalpin, Use 'perf list --help',show like screen shot, perf can access raw event.

[Roman_D_Intel]

Hi Lin Wang, the -e rXXX format is to collect statistics for *on-core* raw PMU events.But you would like to monitor events from *uncore* PMU. I need to check on the status of perf uncore support in Linux. There was a recent development in that direction. In the meantime, could you send the Linux kernel version you are using ("uname -a" command). Roman

[Roman_D_Intel]

The initial support for Xeon E5620 (and other processors with microarchitecture codenamed Nehalem-EP, Westmere-EP and SandyBridge-EP) uncore events is included into the Linux kernel mainline starting from version 3.5

[lin_w_2]

hello Roman this screen shot is my linux kernel best regards, lin wang

[Roman_D_Intel · Accepted solution]

Hi Lin Wang, the uncore PMU is not supported in perf in your Linux kernel. You need to try Linux kernel 3.5. Thanks, Roman

[lin_w_2]

hello, Roman, where are you find information about the support linux version, can you give me the link or document. I want learn more. Thank you. best regards, lin wang

[Roman_D_Intel]

Hi Lin Wang, the uncore perf support has been improved in Linux kernel 3.6: see here . Roman

[lin_w_]

I have installed linux-tools-3.5 for profiling,but I can't get uncore PMU now, I will try linux-tools-3.6 the next few days.