dmstats - Linux
Overview
dmstats is a tool for displaying statistics about the Direct Memory Access (DMA) subsystem on Linux systems. It provides detailed information about DMA channels, controllers, and buses, allowing administrators to monitor and diagnose DMA-related issues.
Syntax
dmstats [options]
Options/Flags
- -a, –all: Display statistics for all DMA channels and controllers.
- -c, –controller: Display statistics for a specific DMA controller.
- -d, –device: Display statistics for a specific DMA device.
- -h, –help: Display help information.
- -v, –verbose: Increase verbosity level.
- -w, –watch: Continuously monitor DMA statistics.
Examples
Display statistics for all DMA devices:
dmstats -a
Display statistics for a specific DMA controller:
dmstats -c 0
Monitor DMA statistics continuously:
dmstats -w
Common Issues
Error: No DMA devices found: This usually indicates that the DMA subsystem is not initialized or is not supported on the system. Check if the DMA driver is loaded and if the DMA controller is enabled in the BIOS.
Integration
Combine with other commands:
- Use
dmstats
withdmesg
to track DMA-related kernel messages. - Use
dmstats
withperf
to analyze DMA performance and identify bottlenecks.
Related Commands
dmesg
perf
iostat