Changes v6: - Rebase onto latest kselftests-next. - Looking at the two patches with a fresh eye decided to make a split along the lines of: - Patch 1/2 contains all of the code that relates to SNC mode detection and checking that detection's reliability. - Patch 2/2 contains checking kernel support for SNC and modifying the messages at the end of affected tests.
Changes v5: - Tests are skipped if snc_unreliable was set. - Moved resctrlfs.c changes from patch 2/2 to 1/2. - Removed CAT changes since it's not impacted by SNC in the selftest. - Updated various comments. - Fixed a bunch of minor issues pointed out in the review.
Changes v4: - Printing SNC warnings at the start of every test. - Printing SNC warnings at the end of every relevant test. - Remove global snc_mode variable, consolidate snc detection functions into one. - Correct minor mistakes.
Changes v3: - Reworked patch 2. - Changed minor things in patch 1 like function name and made corrections to the patch message.
Changes v2: - Removed patches 2 and 3 since now this part will be supported by the kernel.
Sub-Numa Clustering (SNC) allows splitting CPU cores, caches and memory into multiple NUMA nodes. When enabled, NUMA-aware applications can achieve better performance on bigger server platforms.
SNC support in the kernel was merged into x86/cache [1]. With SNC enabled and kernel support in place all the tests will function normally (aside from effective cache size). There might be a problem when SNC is enabled but the system is still using an older kernel version without SNC support. Currently the only message displayed in that situation is a guess that SNC might be enabled and is causing issues. That message also is displayed whenever the test fails on an Intel platform.
Add a mechanism to discover kernel support for SNC which will add more meaning and certainty to the error message.
Add runtime SNC mode detection and verify how reliable that information is.
Series was tested on Ice Lake server platforms with SNC disabled, SNC-2 and SNC-4. The tests were also ran with and without kernel support for SNC.
Series applies cleanly on kselftest/next.
[1] https://lore.kernel.org/all/20240628215619.76401-1-tony.luck@intel.com/
Previous versions of this series: [v1] https://lore.kernel.org/all/cover.1709721159.git.maciej.wieczor-retman@intel... [v2] https://lore.kernel.org/all/cover.1715769576.git.maciej.wieczor-retman@intel... [v3] https://lore.kernel.org/all/cover.1719842207.git.maciej.wieczor-retman@intel... [v4] https://lore.kernel.org/all/cover.1720774981.git.maciej.wieczor-retman@intel... [v5] https://lore.kernel.org/all/cover.1730206468.git.maciej.wieczor-retman@intel...
Maciej Wieczor-Retman (2): selftests/resctrl: Adjust effective L3 cache size with SNC enabled selftests/resctrl: Discover SNC kernel support and adjust messages
tools/testing/selftests/resctrl/cmt_test.c | 4 +- tools/testing/selftests/resctrl/mba_test.c | 2 + tools/testing/selftests/resctrl/mbm_test.c | 4 +- tools/testing/selftests/resctrl/resctrl.h | 5 + .../testing/selftests/resctrl/resctrl_tests.c | 9 +- tools/testing/selftests/resctrl/resctrlfs.c | 129 ++++++++++++++++++ 6 files changed, 148 insertions(+), 5 deletions(-)