DOTFILES | AMD-focused

Since I'm a full AMD user, none of the following configuration files are guaranteed to work outside of AMD.

Specs

• CPU: AMD Ryzen 5 5600XT (6c/12t)
• RAM: 32GB RAM DDR4 @ 3200 MHz (1600 MT/s)
• GPU: AMD Radeon RX 570 OC 8GB

Latency Analysis

Real-time kernel latency measurements for AMD Ryzen 5 5600XT using cyclictest.

CLOCK_MONOTONIC vs CLOCK_REALTIME

The following plots compare latency characteristics across both monotonic and realtime clock sources:

CLOCK_MONOTONIC - Measures elapsed time since system boot, unaffected by manual clock adjustments:

CLOCK_REALTIME - Measures wall-clock time, affected by manual clock adjustments and NTP:

Test Parameters

• Duration: 1 minute
• Priority: 90 (SCHED_FIFO)
• Interval: 200 µs
• Histogram Resolution: 400 µs buckets
• Mode: System-wide SMP with memory locking enabled
• Reference Clock: CLOCK_MONOTONIC

Interpretation

• Y-axis (logarithmic scale): Number of latency samples in each bucket
• X-axis: Latency measurement in microseconds (µs), capped at 400 µs
• Multiple lines: Represent latency distributions per CPU core

Clock Type Differences

• CLOCK_MONOTONIC: Not affected by system administrator time adjustments or NTP corrections; ideal for measuring intervals
• CLOCK_REALTIME: Affected by manual clock changes and automatic NTP adjustments; represents actual wall-clock time

For more information on real-time performance tuning, see the Real-Time Linux Wiki and the clock_gettime(2) man page.