forked from Minki/linux
f2c24ebadd
" -- " is an em dash (—) in asciidoc, so all these examples that were supposed to be producing a literal two dashes were being misrendered. Signed-off-by: Alyssa Ross <hi@alyssa.is> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lore.kernel.org/lkml/20210809153226.332545-1-hi@alyssa.is Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
89 lines
2.9 KiB
Plaintext
89 lines
2.9 KiB
Plaintext
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]
|