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f9ed693e8b
This functionality is based on recently introduced sysfs attributes for
Intel® Xeon® Scalable processor family (code name Skylake-SP):
Commit bb42b3d397 ("perf/x86/intel/uncore: Expose an Uncore unit to IIO PMON mapping")
Mode is intended to provide four I/O performance metrics in MB per each
PCIe root port:
- Inbound Read: I/O devices below root port read from the host memory
- Inbound Write: I/O devices below root port write to the host memory
- Outbound Read: CPU reads from I/O devices below root port
- Outbound Write: CPU writes to I/O devices below root port
Each metric requiries only one uncore event which increments at every 4B
transfer in corresponding direction. The formulas to compute metrics
are generic:
#EventCount * 4B / (1024 * 1024)
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Alexander Antonov <alexander.antonov@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey V Bayduraev <alexey.v.bayduraev@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210419094147.15909-4-alexander.antonov@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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2.9 KiB
Text
88 lines
No EOL
2.9 KiB
Text
perf-iostat(1)
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===============
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NAME
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----
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perf-iostat - Show I/O performance metrics
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SYNOPSIS
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--------
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[verse]
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'perf iostat' list
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'perf iostat' <ports> -- <command> [<options>]
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DESCRIPTION
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-----------
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Mode is intended to provide four I/O performance metrics per each PCIe root port:
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- Inbound Read - I/O devices below root port read from the host memory, in MB
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- Inbound Write - I/O devices below root port write to the host memory, in MB
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- Outbound Read - CPU reads from I/O devices below root port, in MB
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- Outbound Write - CPU writes to I/O devices below root port, in MB
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OPTIONS
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-------
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<command>...::
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Any command you can specify in a shell.
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list::
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List all PCIe root ports.
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<ports>::
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Select the root ports for monitoring. Comma-separated list is supported.
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EXAMPLES
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--------
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1. List all PCIe root ports (example for 2-S platform):
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$ perf iostat list
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S0-uncore_iio_0<0000:00>
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S1-uncore_iio_0<0000:80>
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S0-uncore_iio_1<0000:17>
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S1-uncore_iio_1<0000:85>
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S0-uncore_iio_2<0000:3a>
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S1-uncore_iio_2<0000:ae>
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S0-uncore_iio_3<0000:5d>
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S1-uncore_iio_3<0000:d7>
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2. Collect metrics for all PCIe root ports:
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$ perf iostat -- dd if=/dev/zero of=/dev/nvme0n1 bs=1M oflag=direct
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357708+0 records in
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357707+0 records out
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375083606016 bytes (375 GB, 349 GiB) copied, 215.974 s, 1.7 GB/s
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Performance counter stats for 'system wide':
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port Inbound Read(MB) Inbound Write(MB) Outbound Read(MB) Outbound Write(MB)
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0000:00 1 0 2 3
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0000:80 0 0 0 0
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0000:17 352552 43 0 21
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0000:85 0 0 0 0
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0000:3a 3 0 0 0
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0000:ae 0 0 0 0
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0000:5d 0 0 0 0
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0000:d7 0 0 0 0
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3. Collect metrics for comma-separated list of PCIe root ports:
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$ perf iostat 0000:17,0:3a -- dd if=/dev/zero of=/dev/nvme0n1 bs=1M oflag=direct
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357708+0 records in
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357707+0 records out
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375083606016 bytes (375 GB, 349 GiB) copied, 197.08 s, 1.9 GB/s
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Performance counter stats for 'system wide':
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port Inbound Read(MB) Inbound Write(MB) Outbound Read(MB) Outbound Write(MB)
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0000:17 358559 44 0 22
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0000:3a 3 2 0 0
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197.081983474 seconds time elapsed
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SEE ALSO
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--------
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linkperf:perf-stat[1] |