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

# [NAME](#NAME)

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

# [SYNOPSIS](#SYNOPSIS)

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

# [DESCRIPTION](#DESCRIPTION)

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](#REQUIREMENTS)

CONFIG\_BPF and bcc.

# [OPTIONS](#OPTIONS)

[-h](#h)

Print usage message.

[-T](#T)

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

[-D](#D)

Show debug infomation of bpf text.

[-d DRIVER](#d)

Filter for driver name.

[-n DEVNAME](#n)

Filter for device name.

[INTERVAL](#INTERVAL)

Print output every interval seconds.

[COUNT](#COUNT)

Total count of trace in seconds.

# [EXAMPLES](#EXAMPLES)

[Trace virtio device statistics and print 1 second summaries, 10 times:](#Trace)

\# **virtiostat 1 10**

[Trace virtio block deivces only:](#Trace~2)

\# **virtiostat -d virtio\_blk**

# [OVERHEAD](#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](#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](#OS)

Linux

# [STABILITY](#STABILITY)

Unstable - in development.

# [AUTHOR](#AUTHOR)

zhenwei pi

# [SEE ALSO](#SEE_ALSO)

[iostat(1)](/man/enterprise-packages/bcc/iostat.1), [iftop(8)](/man/enterprise-packages/bcc/iftop.8), [funccount(8)](/man/enterprise-packages/bcc/funccount.8)

2021-02-15 USER COMMANDS

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Document: virtiostat(8) from bcc 0.37.0-r2 (Chainguard OS)
Source: https://github.com/iovisor/bcc