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* tools turbostat: reduce measurement overhead due to IPIsLen Brown2012-03-291-0/+46
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | turbostat uses /dev/cpu/*/msr interface to read MSRs. For modern systems, it reads 10 MSR/CPU. This can be observed as 10 "Function Call Interrupts" per CPU per sample added to /proc/interrupts. This overhead is measurable on large idle systems, and as Yoquan Song pointed out, it can even trick cpuidle into thinking the system is busy. Here turbostat re-schedules itself in-turn to each CPU so that its MSR reads will always be local. This replaces the 10 "Function Call Interrupts" with a single "Rescheduling interrupt" per sample per CPU. On an idle 32-CPU system, this shifts some residency from the shallow c1 state to the deeper c7 state: # ./turbostat.old -s %c0 GHz TSC %c1 %c3 %c6 %c7 %pc2 %pc3 %pc6 %pc7 0.27 1.29 2.29 0.95 0.02 0.00 98.77 20.23 0.00 77.41 0.00 0.25 1.24 2.29 0.98 0.02 0.00 98.75 20.34 0.03 77.74 0.00 0.27 1.22 2.29 0.54 0.00 0.00 99.18 20.64 0.00 77.70 0.00 0.26 1.22 2.29 1.22 0.00 0.00 98.52 20.22 0.00 77.74 0.00 0.26 1.38 2.29 0.78 0.02 0.00 98.95 20.51 0.05 77.56 0.00 ^C i# ./turbostat.new -s %c0 GHz TSC %c1 %c3 %c6 %c7 %pc2 %pc3 %pc6 %pc7 0.27 1.20 2.29 0.24 0.01 0.00 99.49 20.58 0.00 78.20 0.00 0.27 1.22 2.29 0.25 0.00 0.00 99.48 20.79 0.00 77.85 0.00 0.27 1.20 2.29 0.25 0.02 0.00 99.46 20.71 0.03 77.89 0.00 0.28 1.26 2.29 0.25 0.01 0.00 99.46 20.89 0.02 77.67 0.00 0.27 1.20 2.29 0.24 0.01 0.00 99.48 20.65 0.00 78.04 0.00 cc: Youquan Song <youquan.song@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
* tools turbostat: add summary optionLen Brown2012-03-291-28/+62
| | | | | | | | | turbostat -s cuts down on the amount of output, per user request. also treak some output whitespace and the man page. Signed-off-by: Len Brown <len.brown@intel.com>
* Merge branches 'einj', 'intel_idle', 'misc', 'srat' and 'turbostat-ivb' into ↵Len Brown2012-01-181-0/+2
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| * tools turbostat: recognize and run properly on IVBLen Brown2011-11-181-0/+2
| | | | | | | | Signed-off-by: Len Brown <len.brown@intel.com>
* | Merge branches 'acpi', 'idle', 'mrst-pmu' and 'pm-tools' into nextLen Brown2011-11-061-13/+15
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| * tools/power turbostat: less verbose debuggingLen Brown2011-07-031-13/+15
| | | | | | | | | | | | dump only the counters which are active Signed-off-by: Len Brown <len.brown@intel.com>
* | tools/power turbostat: fit output into 80 columns on snb-epLen Brown2011-08-021-23/+23
|/ | | | | | | | | | Reduce columns for package number to 1. If you can afford more than 9 packages, you can also afford a terminal with more than 80 columns:-) Also shave a column also off the package C-states Signed-off-by: Len Brown <len.brown@intel.com>
* treewide: remove extra semicolonsJustin P. Mattock2011-04-101-1/+1
| | | | | Signed-off-by: Justin P. Mattock <justinmattock@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* tools: turbostat: style updatesLen Brown2011-02-101-100/+96
| | | | | | | | | | | Follow kernel coding style traditions more closely. Delete typedef, re-name "per cpu counters" to simply be counters etc. This patch changes no functionality. Suggested-by: Thiago Farina <tfransosi@gmail.com> Signed-off-by: Len Brown <len.brown@intel.com>
* tools: turbostat: fix bitwise and operandThomas Renninger2011-02-101-2/+2
| | | | | | | | bug could cause false positive on indicating presence of invarient TSC or APERF support. Signed-off-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Len Brown <len.brown@intel.com>
* tools: create power/x86/turbostatLen Brown2011-01-111-0/+1048
turbostat is a Linux tool to observe proper operation of Intel(R) Turbo Boost Technology. turbostat displays the actual processor frequency on x86 processors that include APERF and MPERF MSRs. Note that turbostat is of limited utility on Linux kernels 2.6.29 and older, as acpi_cpufreq cleared APERF/MPERF up through that release. On Intel Core i3/i5/i7 (Nehalem) and newer processors, turbostat also displays residency in idle power saving states, which are necessary for diagnosing any cpuidle issues that may have an effect on turbo-mode. See the turbostat.8 man page for example usage. Signed-off-by: Len Brown <len.brown@intel.com>
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