Hello guys, I have a question regarding LLC occupancy recorded by Intel Cache Monitoring Technology, on Linux. I use perf_event_open(2) and read(2) to gather CMT values and I multiply by a "scaling value" read from '/sys/devices/intel_cqm/events/llc_occupancy.scale' in order to obtain a result in bytes (that's for instance what libvirt does). But that file gives me a "scaling value" of 32768. When looking at the corresponding code in the Linux kernel ('arch/x86/events/intel/cqm.c', around line 1716), I understand that the returned value should be the processor's cache line size: cqm_l3_scale = boot_cpu_data.x86_cache_occ_scale; [...] get_online_cpus(); for_each_online_cpu(cpu) { struct cpuinfo_x86 *c = &cpu_data(cpu); if (c->x86_cache_max_rmid < cqm_max_rmid) cqm_max_rmid = c->x86_cache_max_rmid; if (c->x86_cache_occ_scale != cqm_l3_scale) { pr_err("Multiple LLC scale values, disabling\n"); ret = -EINVAL; goto out; } } [...] snprintf(scale, sizeof(scale), "%u", cqm_l3_scale); str = kstrdup(scale, GFP_KERNEL); if (!str) { ret = -ENOMEM; goto out; } event_attr_intel_cqm_llc_scale.event_str = str; I understand that 'event_attr_intel_cqm_llc_scale.event_str' is the value I should read from the file, i.e. the CPU's cache line size, which is 64 in most cases and in mine. Am I missing something? Thanks for any help! Regards, Thibaut S.