Hi Shaopeng Tan,
Please use capitalization for CPU (in subject).
On 3/15/2022 10:59 PM, Shaopeng Tan wrote:
> According to "Intel Resource Director Technology (Intel RDT) on
> 2nd Generation Intel Xeon Scalable Processors Reference Manual",
> When the Intel Sub-NUMA Clustering(SNC) feature is enabled,
> Intel CMT and MBM counters may not be accurate.
>
> However, there does not seem to be an architectural way to detect
> if SNC is enabled.
>
> If the result of MBM&CMT test fails on Intel CPU,
> print a message to let users know a possible cause of failure.
>
> Signed-off-by: Shaopeng Tan <tan.shaopeng@xxxxxxxxxxxxxx>
> ---
> tools/testing/selftests/resctrl/resctrl_tests.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c
> index dc548d3e2454..97ad6cfee6ee 100644
> --- a/tools/testing/selftests/resctrl/resctrl_tests.c
> +++ b/tools/testing/selftests/resctrl/resctrl_tests.c
> @@ -86,6 +86,8 @@ static void run_mbm_test(bool has_ben, char **benchmark_cmd, int span,
> sprintf(benchmark_cmd[5], "%s", MBA_STR);
> res = mbm_bw_change(span, cpu_no, bw_report, benchmark_cmd);
> ksft_test_result(!res, "MBM: bw change\n");
> + if ((get_vendor() == ARCH_INTEL) && res)
> + ksft_print_msg("Intel MBM may be inaccurate when Sub-NUMA Clustering is enabled. Check BIOS configuration.\n");
> mbm_test_cleanup();
> }
>
> @@ -122,6 +124,8 @@ static void run_cmt_test(bool has_ben, char **benchmark_cmd, int cpu_no)
> sprintf(benchmark_cmd[5], "%s", CMT_STR);
> res = cmt_resctrl_val(cpu_no, 5, benchmark_cmd);
> ksft_test_result(!res, "CMT: test\n");
> + if ((get_vendor() == ARCH_INTEL) && res)
> + ksft_print_msg("Intel CMT may be inaccurate when Sub-NUMA Clustering is enabled. Check BIOS configuration.\n");
> cmt_test_cleanup();
> }
>
Thank you very much for adding this.
Acked-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>
Reinette
