0001 perf-iostat(1)
0002 ===============
0003
0004 NAME
0005 ----
0006 perf-iostat - Show I/O performance metrics
0007
0008 SYNOPSIS
0009 --------
0010 [verse]
0011 'perf iostat' list
0012 'perf iostat' <ports> \-- <command> [<options>]
0013
0014 DESCRIPTION
0015 -----------
0016 Mode is intended to provide four I/O performance metrics per each PCIe root port:
0017
0018 - Inbound Read - I/O devices below root port read from the host memory, in MB
0019
0020 - Inbound Write - I/O devices below root port write to the host memory, in MB
0021
0022 - Outbound Read - CPU reads from I/O devices below root port, in MB
0023
0024 - Outbound Write - CPU writes to I/O devices below root port, in MB
0025
0026 OPTIONS
0027 -------
0028 <command>...::
0029 Any command you can specify in a shell.
0030
0031 list::
0032 List all PCIe root ports.
0033
0034 <ports>::
0035 Select the root ports for monitoring. Comma-separated list is supported.
0036
0037 EXAMPLES
0038 --------
0039
0040 1. List all PCIe root ports (example for 2-S platform):
0041
0042 $ perf iostat list
0043 S0-uncore_iio_0<0000:00>
0044 S1-uncore_iio_0<0000:80>
0045 S0-uncore_iio_1<0000:17>
0046 S1-uncore_iio_1<0000:85>
0047 S0-uncore_iio_2<0000:3a>
0048 S1-uncore_iio_2<0000:ae>
0049 S0-uncore_iio_3<0000:5d>
0050 S1-uncore_iio_3<0000:d7>
0051
0052 2. Collect metrics for all PCIe root ports:
0053
0054 $ perf iostat -- dd if=/dev/zero of=/dev/nvme0n1 bs=1M oflag=direct
0055 357708+0 records in
0056 357707+0 records out
0057 375083606016 bytes (375 GB, 349 GiB) copied, 215.974 s, 1.7 GB/s
0058
0059 Performance counter stats for 'system wide':
0060
0061 port Inbound Read(MB) Inbound Write(MB) Outbound Read(MB) Outbound Write(MB)
0062 0000:00 1 0 2 3
0063 0000:80 0 0 0 0
0064 0000:17 352552 43 0 21
0065 0000:85 0 0 0 0
0066 0000:3a 3 0 0 0
0067 0000:ae 0 0 0 0
0068 0000:5d 0 0 0 0
0069 0000:d7 0 0 0 0
0070
0071 3. Collect metrics for comma-separated list of PCIe root ports:
0072
0073 $ perf iostat 0000:17,0:3a -- dd if=/dev/zero of=/dev/nvme0n1 bs=1M oflag=direct
0074 357708+0 records in
0075 357707+0 records out
0076 375083606016 bytes (375 GB, 349 GiB) copied, 197.08 s, 1.9 GB/s
0077
0078 Performance counter stats for 'system wide':
0079
0080 port Inbound Read(MB) Inbound Write(MB) Outbound Read(MB) Outbound Write(MB)
0081 0000:17 358559 44 0 22
0082 0000:3a 3 2 0 0
0083
0084 197.081983474 seconds time elapsed
0085
0086 SEE ALSO
0087 --------
0088 linkperf:perf-stat[1]
