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- perf-iostat(1)
- ===============
- NAME
- ----
- perf-iostat - Show I/O performance metrics
- SYNOPSIS
- --------
- [verse]
- 'perf iostat' list
- 'perf iostat' <ports> \-- <command> [<options>]
- DESCRIPTION
- -----------
- Mode is intended to provide four I/O performance metrics per each PCIe root port:
- - Inbound Read - I/O devices below root port read from the host memory, in MB
- - Inbound Write - I/O devices below root port write to the host memory, in MB
- - Outbound Read - CPU reads from I/O devices below root port, in MB
- - Outbound Write - CPU writes to I/O devices below root port, in MB
- OPTIONS
- -------
- <command>...::
- Any command you can specify in a shell.
- list::
- List all PCIe root ports.
- <ports>::
- Select the root ports for monitoring. Comma-separated list is supported.
- EXAMPLES
- --------
- 1. List all PCIe root ports (example for 2-S platform):
- $ perf iostat list
- S0-uncore_iio_0<0000:00>
- S1-uncore_iio_0<0000:80>
- S0-uncore_iio_1<0000:17>
- S1-uncore_iio_1<0000:85>
- S0-uncore_iio_2<0000:3a>
- S1-uncore_iio_2<0000:ae>
- S0-uncore_iio_3<0000:5d>
- S1-uncore_iio_3<0000:d7>
- 2. Collect metrics for all PCIe root ports:
- $ perf iostat -- dd if=/dev/zero of=/dev/nvme0n1 bs=1M oflag=direct
- 357708+0 records in
- 357707+0 records out
- 375083606016 bytes (375 GB, 349 GiB) copied, 215.974 s, 1.7 GB/s
- Performance counter stats for 'system wide':
- port Inbound Read(MB) Inbound Write(MB) Outbound Read(MB) Outbound Write(MB)
- 0000:00 1 0 2 3
- 0000:80 0 0 0 0
- 0000:17 352552 43 0 21
- 0000:85 0 0 0 0
- 0000:3a 3 0 0 0
- 0000:ae 0 0 0 0
- 0000:5d 0 0 0 0
- 0000:d7 0 0 0 0
- 3. Collect metrics for comma-separated list of PCIe root ports:
- $ perf iostat 0000:17,0:3a -- dd if=/dev/zero of=/dev/nvme0n1 bs=1M oflag=direct
- 357708+0 records in
- 357707+0 records out
- 375083606016 bytes (375 GB, 349 GiB) copied, 197.08 s, 1.9 GB/s
- Performance counter stats for 'system wide':
- port Inbound Read(MB) Inbound Write(MB) Outbound Read(MB) Outbound Write(MB)
- 0000:17 358559 44 0 22
- 0000:3a 3 2 0 0
- 197.081983474 seconds time elapsed
- SEE ALSO
- --------
- linkperf:perf-stat[1]
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