virtiostat-bpfcc(8)

Usage

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

Overview

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.

Requirements

CONFIG_BPF and bcc.

Options

-h: Print usage message.

-T: Include a time column on output (HH:MM:SS).

-D: Show debug infomation of bpf text.

-d DRIVER: Filter for driver name.

-n DEVNAME: Filter for device name.

`INTERVAL`	Print output every interval seconds.
`COUNT`	Total count of trace in seconds.

Examples

`Trace virtio device statistics and print 1 second summaries, 10 times:`	# virtiostat 1 10
`Trace virtio block deivces only:`	# virtiostat -d virtio_blk

Overhead

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.

Source

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.

OS

Linux

Stability

Unstable - in development.

Releases

Unchanged in 2 releases since Debian 12 (Bookworm).

12–13