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Fri, 27 Mar 2026 23:22:13 +0000 Message-ID: Date: Fri, 27 Mar 2026 16:21:54 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 08/10] selftests/resctrl: Remove requirement on cache miss rate To: =?UTF-8?Q?Ilpo_J=C3=A4rvinen?= CC: , , , , , , , , , , , , , LKML , References: <1fc79420f76d585231252e59d4fcf19b3e704ee3.1773432891.git.reinette.chatre@intel.com> <4e3b5362-e751-03a4-f98c-a760ad274d02@linux.intel.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <4e3b5362-e751-03a4-f98c-a760ad274d02@linux.intel.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: MW4PR03CA0310.namprd03.prod.outlook.com (2603:10b6:303:dd::15) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB7573:EE_|CYXPR11MB8711:EE_ X-MS-Office365-Filtering-Correlation-Id: 8238f081-4020-4de9-8b4f-08de8c57ad43 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|1800799024|376014|366016|56012099003|22082099003|18002099003; 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With e.g. 5 vs 4 >> - * bits in the CBM mask, the minimum difference must be at least >> - * MIN_DIFF_PERCENT_PER_BIT * (4 - 1) = 3 percent. >> - * >> - * The relationship between number of used CBM bits and difference in LLC >> - * misses is not expected to be linear. With a small number of bits, the >> - * margin is smaller than with larger number of bits. For selftest purposes, >> - * however, linear approach is enough because ultimately only pass/fail >> - * decision has to be made and distinction between strong and stronger >> - * signal is irrelevant. >> - */ >> -#define MIN_DIFF_PERCENT_PER_BIT 1UL >> - >> static int show_results_info(__u64 sum_llc_val, int no_of_bits, >> unsigned long cache_span, >> - unsigned long min_diff_percent, >> unsigned long num_of_runs, bool platform, >> __s64 *prev_avg_llc_val) >> { >> __u64 avg_llc_val = 0; >> - float avg_diff; >> int ret = 0; >> >> avg_llc_val = sum_llc_val / num_of_runs; >> if (*prev_avg_llc_val) { >> - float delta = (__s64)(avg_llc_val - *prev_avg_llc_val); >> - >> - avg_diff = delta / *prev_avg_llc_val; >> - ret = platform && (avg_diff * 100) < (float)min_diff_percent; >> - >> - ksft_print_msg("%s Check cache miss rate changed more than %.1f%%\n", >> - ret ? "Fail:" : "Pass:", (float)min_diff_percent); >> + ret = platform && (avg_llc_val < *prev_avg_llc_val); >> >> - ksft_print_msg("Percent diff=%.1f\n", avg_diff * 100); >> + ksft_print_msg("%s Check cache miss rate increased\n", >> + ret ? "Fail:" : "Pass:"); > > While I'm fine with removing the amount of change check, this no longer > shows any numbers which would be a bit annoying if/when there's a failure. > This snippet only removes display of the number that is no longer computed ("avg_diff"). The values that are compared now, avg_llc_val and it previous value, are printed in the call to show_cache_info() that follows this snippet but is not visible in the diff. Below is an example of what a user running the CAT test will see after these changes. Since show_cache_info() always prints avg_llc_val the user can obtain insight into failure by considering it and its previous measurement. # Starting L3_CAT test ... # Mounting resctrl to "/sys/fs/resctrl" # Cache size :117964800 # Writing benchmark parameters to resctrl FS # Write schema "L2:1=0x1" to resctrl FS # Write schema "L3:0=1fc0" to resctrl FS # Write schema "L3:0=3f" to resctrl FS # Write schema "L3:0=1ff0" to resctrl FS # Write schema "L3:0=f" to resctrl FS # Write schema "L3:0=1ffc" to resctrl FS # Write schema "L3:0=3" to resctrl FS # Checking for pass/fail # Number of bits: 6 # Average LLC val: 445092 # Cache span (lines): 737280 # Pass: Check cache miss rate increased # Number of bits: 4 # Average LLC val: 724472 # Cache span (lines): 491520 # Pass: Check cache miss rate increased # Number of bits: 2 # Average LLC val: 1085470 # Cache span (lines): 245760 ok 4 L3_CAT: test Reinette