Prerequisites

PCIe metrics:
Per-device PCIe traffic metrics are available starting with server platforms based on Intel® microarchitecture code named Skylake. To collect per-device metrics, use one of the following options:
Load the sampling driver
Use Linux perf-based collection, available for Linux kernel versions 5.10 and newer
Run the analysis with root privileges
To collect Intel® DDIO utilization efficiency metrics, make sure that the sampling driver is loaded
DPDK metrics:
make sure DPDK is built with
VTune
Profiler
support enabled.
SPDK metrics:
make sure SPDK is built using the
--with-vtune
advanced build option.
Linux Kernel I/O:
to collect these metrics,
VTune
Profiler
enables FTrace* collection that requires access to
debugfs
. On some systems, this requires that you reconfigure your permissions for the
prepare_debugfs.sh
script located in the
bin
directory, or use root privileges.

Prepare your system for analysis following the steps described in the Set Up FreeBSD System topic.
SPDK metrics:
make sure SPDK is built using the
--with-vtune
advanced build option.

Configure and Run Analysis

Launch
VTune
Profiler
and, optionally, create a new project.
Click the
Configure Analysis
button.
In the
WHERE
pane, select the target system to profile.
In the
HOW
pane, select
Platform Analysis > Input and Output
.
In the
WHAT
pane, specify your analysis target (application, process, or system).
Depending on your target app and analysis purpose, choose any of the following configuration options:
Analyze PCIe traffic check box	Collect the data required to: Calculate inbound and outbound PCIe traffic Calculate L3 misses of inbound PCIe requests Calculate average inbound PCIe read and write latency Detect core/IO conflicts This option is shown on server platforms based on Intel® microarchitecture code named Sandy Bridge EP and newer. Where applicable, this option is enabled by default.
Locate MMIO accesses check box	Collect the data required to locate code that induces outbound PCIe traffic by accessing device memory through the MMIO address space. This option is not available in Profile System mode. This option is not available on FreeBSD systems. This option is enabled by default.
Analyze memory and cross-socket bandwidth check box	Collect the data required to calculate DRAM and Intel® Ultra Path Interconnect (Intel® UPI) or Intel® QuickPath Interconnect (Intel® QPI) bandwidth. While DRAM bandwidth data is always collected, Intel® UPI and Intel® QPI cross-socket bandwidth data is only collected when applicable to the system. This option is enabled by default.
Evaluate max DRAM bandwidth check box	Evaluate the maximum achievable local DRAM bandwidth before the collection starts. This data is used to scale bandwidth metrics on the timeline and to calculate thresholds. To reduce overhead, it is recommended to disable this option when profiling in Attach to Process mode. This option is enabled by default.
Select API to profile check box group	Select IO APIs to profile: To profile DPDK applications, select the DPDK checkbox. To profile SPDK applications, select the SPDK checkbox. To profile Linux kernel I/O, select the Kernel IO checkbox. DPDK and Linux kernel I/O profiling are not available on FreeBSD systems. All options are disabled by default.
SPDK and Linux kernel I/O metrics cannot be collected simultaneously.
Click
Start
to run the analysis.

vtune -collect io [-knob <value>] -- <target> [target_options]

View Data