Performance Counter Series #1 #WindowsInternals #Perfmon
Counter Structure: Image
Performance Counter Series #2 #WindowsInternals #Perfmon
Counter Types:
Instantaneous - Displays the most recent measurement, Single observation, or Sample of the value right now - example: Memory\Available Bytes (1/4)
Interval - Retrieves the current value of this counter at every measurement interval - example: Physical Disk\Disk Transfers/sec (2/4)
Average - Displays an average of the counter value at every measurement interval - example: Processor\Average Idle Time (3/4)
Elapsed Time - Counters that are gathered on an interval basis but cannot be summarized - example: System\System Up Time (4/4)

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More from @vagnerpilar

13 Oct
#ETW is an efficient kernel-level tracing facility that lets you log kernel or app-defined events to a log file (#ETL). You can consume the events in real time or from a log file and use them to debug an app or to determine where perf issues are occurring in the app. (1/17)
ETW lets you enable or disable event tracing dynamically, allowing you to perform detailed tracing in a production environment without requiring computer or application restarts. (2/17)
The Event Tracing API is broken into three distinct components:
1 - Controllers, which start and stop an event tracing session and enable providers
2 - Providers, which provide the events
3 - Consumers, which consume the events (3/17)
Read 17 tweets
11 Oct
Drivers are call back mechanisms to send or retrieve I/O between the operating system and devices such as NIC’s, Storage Controllers, and USB keyboards and mice.
They are typically loaded during the system boot sequence (after NTLDR but before Ctrl+Alt+Del presentation). (2/7)
Device load order groups ensure driver load in the correct order, such as A/V filter drivers loading after the NTFS.SYS has initialized as an example. (3/7)
Read 7 tweets
11 Oct
Articles #WindowsInternals (1/6)
Introduction to DPCs
msdn.microsoft.com/en-us/library/… (2/6)
Deferred Procedure Call Details: osronline.com/article.cfm?ar…
RSS with Message Signaled Interrupts
msdn.microsoft.com/en-us/library/…
Timer Objects and DPCs
msdn.microsoft.com/en-us/library/…
Give Microsoft’s Scalable Networking Pack Another Look
windowsitpro.com/networking/giv… (3/6)
Read 6 tweets
11 Oct
Until threads that are suspended or blocked become ready to run, the scheduler does not allocate any processor time to them, regardless of their priority (2/8)
Because Windows implements a preemptive scheduler, if another thread with higher priority becomes ready to run, the currently running thread might be preempted before finishing its time slice. (3/8)
Read 8 tweets
11 Oct
CPU Scheduler #WindowsInternals (1/9)
The system scheduler controls multitasking by determining which of the competing threads receives the next processor time slice. (2/9)
There is no single “scheduler” module or routine, the code is spread throughout the kernel in which scheduling-related events occur. The routines that perform these duties are called the kernel’s dispatcher (3/9)
Read 9 tweets
11 Oct
CPU Idle States #Cstates #WindowsInternals (1/6)
C-states, also known as CPU Idle states, are states when the CPU has reduced or turned off selected functions. Different processors support different numbers of C-states in which various parts of the CPU are turned off. (2/6)
Generally, higher C-states shut off more parts of the CPU, leading to significantly reduced power consumption.
Processor Power Policy is owned and managed by the Windows Kernel Power Manager. (3/6)
Read 7 tweets

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