diff options
| author | Reinette Chatre <reinette.chatre@intel.com> | 2024-10-24 14:18:49 -0700 |
|---|---|---|
| committer | Shuah Khan <skhan@linuxfoundation.org> | 2024-11-04 17:02:03 -0700 |
| commit | f77b9672536e581c945b2623b521a284fdbf75ff (patch) | |
| tree | 7c9055082837b5ede6a1ba98b2ecaabfe66610e7 /tools/testing/selftests/resctrl/resctrl_tests.c | |
| parent | 3cb3f0b8755919648281064d44c06319743db343 (diff) | |
selftests/resctrl: Use cache size to determine "fill_buf" buffer size
By default the MBM and MBA tests use the "fill_buf" benchmark to
read from a buffer with the goal to measure the memory bandwidth
generated by this buffer access.
Care should be taken when sizing the buffer used by the "fill_buf"
benchmark. If the buffer is small enough to fit in the cache then
it cannot be expected that the benchmark will generate much memory
bandwidth. For example, on a system with 320MB L3 cache the existing
hardcoded default of 250MB is insufficient.
Use the measured cache size to determine a buffer size that can be
expected to trigger memory access while keeping the existing default
as minimum, now renamed to MINIMUM_SPAN, that has been appropriate for
testing so far.
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Diffstat (limited to 'tools/testing/selftests/resctrl/resctrl_tests.c')
| -rw-r--r-- | tools/testing/selftests/resctrl/resctrl_tests.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c index 24daf76b4039..3335af815b21 100644 --- a/tools/testing/selftests/resctrl/resctrl_tests.c +++ b/tools/testing/selftests/resctrl/resctrl_tests.c @@ -189,7 +189,7 @@ static struct fill_buf_param *alloc_fill_buf_param(struct user_params *uparams) ksft_exit_skip("Unable to parse benchmark buffer size.\n"); } } else { - fill_param->buf_size = DEFAULT_SPAN; + fill_param->buf_size = MINIMUM_SPAN; } if (uparams->benchmark_cmd[2] && *uparams->benchmark_cmd[2] != '\0') { |