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Reinette Chatre
08d592641e
The L3 CAT test loads a buffer into cache that is proportional to the L3 size allocated for the workload and measures cache misses when accessing the buffer as a test of L3 occupancy. When loading the buffer it can be assumed that a portion of the buffer will be loaded into the L2 cache and depending on cache design may not be present in L3. It is thus possible for data to not be in L3 but also not trigger an L3 cache miss when accessed. Reduce impact of L2 on the L3 CAT test by, if L2 allocation is supported, minimizing the portion of L2 that the workload can allocate into. This encourages most of buffer to be loaded into L3 and support better comparison between buffer size, cache portion, and cache misses when accessing the buffer. Link: https://lore.kernel.org/r/1f5aad318889cd6d4f9a8d8b0fbe83e3848d41a9.1775266384.git.reinette.chatre@intel.com Signed-off-by: Reinette Chatre <[email protected]> Tested-by: Chen Yu <[email protected]> Reviewed-by: Ilpo Järvinen <[email protected]> Signed-off-by: Shuah Khan <[email protected]>
resctrl_tests - resctrl file system test suit Authors: Fenghua Yu <[email protected]> Sai Praneeth Prakhya <[email protected]>, resctrl_tests tests various resctrl functionalities and interfaces including both software and hardware. Currently it supports Memory Bandwidth Monitoring test and Memory Bandwidth Allocation test on Intel RDT hardware. More tests will be added in the future. And the test suit can be extended to cover AMD QoS and ARM MPAM hardware as well. resctrl_tests can be run with or without kselftest framework. WITH KSELFTEST FRAMEWORK ======================= BUILD ----- Build executable file "resctrl_tests" from top level directory of the kernel source: $ make -C tools/testing/selftests TARGETS=resctrl RUN --- Run resctrl_tests as sudo or root since the test needs to mount resctrl file system and change contents in the file system. Using kselftest framework will run all supported tests within resctrl_tests: $ sudo make -C tools/testing/selftests TARGETS=resctrl run_tests More details about kselftest framework can be found in Documentation/dev-tools/kselftest.rst. WITHOUT KSELFTEST FRAMEWORK =========================== BUILD ----- Build executable file "resctrl_tests" from this directory(tools/testing/selftests/resctrl/): $ make RUN --- Run resctrl_tests as sudo or root since the test needs to mount resctrl file system and change contents in the file system. Executing the test without any parameter will run all supported tests: $ sudo ./resctrl_tests OVERVIEW OF EXECUTION ===================== A test case has four stages: - setup: mount resctrl file system, create group, setup schemata, move test process pids to tasks, start benchmark. - execute: let benchmark run - verify: get resctrl data and verify the data with another source, e.g. perf event. - teardown: umount resctrl and clear temporary files. ARGUMENTS ========= Parameter '-h' shows usage information. usage: resctrl_tests [-h] [-b "benchmark_cmd [options]"] [-t test list] [-n no_of_bits] -b benchmark_cmd [options]: run specified benchmark for MBM, MBA and CMT default benchmark is builtin fill_buf -t test list: run tests specified in the test list, e.g. -t mbm,mba,cmt,cat -n no_of_bits: run cache tests using specified no of bits in cache bit mask -p cpu_no: specify CPU number to run the test. 1 is default -h: help