Intel RDT for 13th Gen Intel(R) Core(TM) i9-13900KS

[shubham4060]

Hi,

i was trying to configure l3cat on my 13th Gen intel i9 server. I couldnt find any resctrl file system available to mount. Further the linux config file has CONFIG_X86_CPU_RESCTRL=y in it but lscpu doesn't show any l3cat bit in the flags. below is the lscpu output

Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Address sizes: 46 bits physical, 48 bits virtual
Byte Order: Little Endian
CPU(s): 8
On-line CPU(s) list: 0-7
Vendor ID: GenuineIntel
BIOS Vendor ID: Intel(R) Corporation
Model name: 13th Gen Intel(R) Core(TM) i9-13900KS
BIOS Model name: 13th Gen Intel(R) Core(TM) i9-13900KS To Be Filled By O.E.M. CPU @ 3.2GHz
BIOS CPU family: 207
CPU family: 6
Model: 183
Thread(s) per core: 1
Core(s) per socket: 8
Socket(s): 1
Stepping: 1
Frequency boost: enabled
CPU(s) scaling MHz: 151%
CPU max MHz: 3201.0000
CPU min MHz: 800.0000
BogoMIPS: 6374.40
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clfl
ush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm con
stant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpui
d aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx smx est
tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc
_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fa
ult epb invpcid_single ssbd ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi fl
expriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invp
cid rdseed adx smap clflushopt clwb intel_pt sha_ni xsaveopt xsavec xgetbv1
xsaves avx_vnni dtherm ida arat pln pts umip pku ospke waitpkg gfni vaes vpc
lmulqdq tme rdpid movdiri movdir64b fsrm md_clear serialize pconfig arch_lbr
flush_l1d arch_capabilities
Virtualization features:
Virtualization: VT-x
Caches (sum of all):
L1d: 384 KiB (8 instances)
L1i: 256 KiB (8 instances)
L2: 16 MiB (8 instances)
L3: 36 MiB (1 instance)
NUMA:
NUMA node(s): 1
NUMA node0 CPU(s): 0-7
Vulnerabilities:
Itlb multihit: Not affected
L1tf: Not affected
Mds: Not affected
Meltdown: Not affected
Mmio stale data: Not affected
Retbleed: Not affected
Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl and seccomp
Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Spectre v2: Mitigation; Enhanced IBRS, IBPB conditional, RSB filling, PBRSB-eIBRS SW seq
uence
Srbds: Not affected
Tsx async abort: Not affected

but when i run pqos --show --verbose, it shows L3CA capability detected in the output, below is the output

NOTE: Mixed use of MSR and kernel interfaces to manage
CAT or CMT & MBM may lead to unexpected behavior.
INFO: Requested interface: AUTO
INFO: resctrl not detected. Kernel version 4.10 or higher required
INFO: Selected interface: MSR
INFO: CACHE: type 1, level 1, max id sharing this cache 2 (1 bits)
INFO: CACHE: type 2, level 1, max id sharing this cache 2 (1 bits)
INFO: CACHE: type 3, level 2, max id sharing this cache 8 (3 bits)
INFO: CACHE: type 3, level 3, max id sharing this cache 128 (7 bits)
WARN: CPUID.0x7.0: Monitoring capability not supported!
INFO: Monitoring capability not detected
INFO: CPUID.0x7.0: L3 CAT not detected. Checking brand string...
WARN: Cache allocation not supported on model name '13th Gen Intel(R) Core(TM) i9-13900KS'!
ERROR: RDMSR failed for reg[0xca0] on lcore 0
INFO: L3CA capability detected
INFO: L3 CAT details: CDP support=0, CDP on=0, #COS=16, #ways=12, ways contention bit-mask 0x0
INFO: L3 CAT details: cache size 37748736 bytes, way size 3145728 bytes
INFO: CPUID.0x7.0: L2 CAT not supported
INFO: L2CA capability not detected
INFO: CPUID.0x7.0: MBA not supported
INFO: MBA capability not detected
L3CA COS definitions for Socket 0:
L3CA COS0 => MASK 0xfff
L3CA COS1 => MASK 0x212
L3CA COS2 => MASK 0xeaa
L3CA COS3 => MASK 0xeee
L3CA COS4 => MASK 0xfff
L3CA COS5 => MASK 0xfff
L3CA COS6 => MASK 0xfff
L3CA COS7 => MASK 0xfff
L3CA COS8 => MASK 0xfff
L3CA COS9 => MASK 0xfff
L3CA COS10 => MASK 0xfff
L3CA COS11 => MASK 0xfff
L3CA COS12 => MASK 0xfff
L3CA COS13 => MASK 0xfff
L3CA COS14 => MASK 0xfff
L3CA COS15 => MASK 0xfff
Core information for socket 0:
Core 0, L2ID 0, L3ID 0 => COS0
Core 1, L2ID 1, L3ID 0 => COS0
Core 2, L2ID 2, L3ID 0 => COS0
Core 3, L2ID 3, L3ID 0 => COS0
Core 4, L2ID 4, L3ID 0 => COS0
Core 5, L2ID 5, L3ID 0 => COS0
Core 6, L2ID 6, L3ID 0 => COS0
Core 7, L2ID 7, L3ID 0 => COS0

So can anyone please help as to whether l3cat is available on my machine or not as both the things specified above seems contradicting and thus confusing me to.

P.S : also added rdt=cmt,l3cat to boot options.

Thanks,

[rkanagar]

pqos --iface=msr -d
pqos --iface=msr -D
Above commands provide RDT capabilities of the system