Command-Line Options
Running the MRL sample workload with the
-h
option yields the following usage message:Usage: taskset --cpu-list 3 mrl_userspace_app --address ADDRESS --iterations ITERATIONS --processor {TGL-U,TGL-H,EHL} [--outliers OUTLIERS] [--threshold THRESHOLD]Option | Description |
|---|---|
taskset --cpu-list 3 | Processor core on which the sample will run. |
--address ADDRESS | Physical memory address of the PCIe device with 0x prefix. Example: 0x607d4dc000. |
--iterations ITERATIONS | Execute N iterations of the main loop to gather more precise timing statistics. |
--processor PROCESSOR | Processor where the MRL application will be executed. |
--outliers OUTLIERS | Optional. This parameter is used to filter iterations that executed greater than N instructions. By default, N is set to the expected amount of instructions for measuring latency of a single MMIO read transaction. By removing iterations with instructions greater than N, MRL is effectively masking interrupts and software overhead. (default: 90) |
--threshold THRESHOLD | Optional. The MRL sample can hang due to a low outliers number. If --outliers N is too small, the sample will never count any iterations and will never stop running because it is waiting to collect N data points as specified in --iterations . To avoid the hang, use the threshold parameter to limit the number of iterations N that the sample should run. This parameter will stop the sample after it has run N iterations. (default: equal to 120% of --iterations N ) |
To get the physical memory address of the PCIe device, run the following commands on each board:
lspci | grep -E 'Ethernet controller: Intel Corporation'The following output example shows the PCIe device name is aa:00.0.
aa:00.0 Ethernet controller: Intel Corporation Device 15f2 (rev 20)If you see
15f2
in the output, the device is an Intel® Ethernet Controller I225.
If you see a0ac
, 43ac
or 4b32
in the output, the device is an integrated TSN Ethernet controller.Run
lspci
with found PCIe device address and search for device memory.lspci -s aa:00.0 -v | grep MemoryThe following output example shows the addresses 88200000 and 88300000.
Memory at 88200000 (32-bit, non-prefetchable) [size=1M]
Memory at 88300000 (32-bit, non-prefetchable) [size=16K]Enter the address in the
--address
field with 0x
prefix.