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The Time Stamp Counter was once a high-resolution, low-overhead way for a program to get CPU timing information. With the advent of multi-core/hyper-threaded CPUs, systems with multiple CPUs, and hibernating operating systems, the TSC cannot be relied upon to provide accurate results — unless great care is taken to correct the possible flaws: rate of tick and whether all cores (processors ...
The documentation of Red Hat MRG version 2 states that TSC is the preferred clock source due to its much lower overhead, but it uses HPET as a fallback. A benchmark in that environment for 10 million event counts found that TSC took about 0.6 seconds, HPET took slightly over 12 seconds, and ACPI Power Management Timer took around 24 seconds.
If the returned values in EBX and ECX of leaf 15h are both nonzero, then the TSC (Time Stamp Counter) frequency in Hz is given by TSCFreq = ECX*(EBX/EAX). On some processors (e.g. Intel Skylake ), CPUID_15h_ECX is zero but CPUID_16h_EAX is present and not zero.
However, the time stamp counter is not a procedure in itself; it is a component of a procedure. Throwing a bunch of code in that does nothing more than read out the time stamp counter does not help with understanding the point, purpose, or use of the time stamp counter, any more than code that simply loads the instruction pointer into the ...
Read 64-bit Time Stamp Counter (TSC) into EDX:EAX. [l] In early processors, the TSC was a cycle counter, incrementing by 1 for each clock cycle (which could cause its rate to vary on processors that could change clock speed at runtime) – in later processors, it increments at a fixed rate that doesn't necessarily match the CPU clock speed. [m]
Timestamping (computing) In computing, timestamping refers to the use of an electronic timestamp to provide a temporal order among a set of events. Timestamping techniques are used in a variety of computing fields, from network management and computer security to concurrency control. [1] [2] For instance, a heartbeat network uses timestamping ...
Trusted timestamping is the process of securely keeping track of the creation and modification time of a document. Security here means that no one—not even the owner of the document—should be able to change it once it has been recorded provided that the timestamper's integrity is never compromised. The administrative aspect involves setting ...
A higher-valued timestamp occurs later in time than a lower-valued timestamp. Generating a timestamp. A number of different approaches can generate timestamps Using the value of the system's clock at the start of a transaction as the timestamp. Using a thread-safe shared counter that is incremented at the start of a transaction as the timestamp.