Man page - virtiostat-bpfcc(8)

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virtiostat(8) System Manager's Manual virtiostat(8)

virtiostat - Trace VIRTIO devices input/output statistics. Uses Linux eBPF/bcc.

virtiostat [-h] [-T] [-D] [-d DRIVER] [-n DEVNAME] [INTERVAL] [COUNT]

This tool traces VIRTIO devices input/output statistics. It works in lower layer of VIRTIO base driver, so it could trace all the devices of VIRTIO family. For example, we can't get IO statistics of 9p-fs in a guest virtual machine by iostat command, but we can analyze IO statistics by virtiostat. The outputing result shows In/Out SGs(scatter list operation) to represent positive correlation IOPS, and In/Out BW to represent throughput.

Since this uses BPF, only the root user can use this tool.

CONFIG_BPF and bcc.

Print usage message.
Include a time column on output (HH:MM:SS).
Show debug infomation of bpf text.
Filter for driver name.
Filter for device name.
Print output every interval seconds.
Total count of trace in seconds.

# virtiostat 1 10
# virtiostat -d virtio_blk

This traces the kernel virtqueue_add_sgs, virtqueue_add_outbuf, virtqueue_add_inbuf, virtqueue_add_inbuf_ctx functions. The rate of this depends on all the VIRTIO devices IOPS.

This is from bcc.

https://github.com/iovisor/bcc

Also look in the bcc distribution for a companion _examples.txt file containing example usage, output, and commentary for this tool.

Linux

Unstable - in development.

zhenwei pi

iostat(1), iftop(8), funccount(8)

2021-02-15 USER COMMANDS