https://issues.dlang.org/show_bug.cgi?id=24254
--- Comment #7 from Jure Pečar <jurij.pe...@embl.de> ---
Here's a diff of `cpuid -1` output from 32c Genoa (-) and 128c Bergamo (+):
@@ -3,16 +3,16 @@
version information (1/eax):
processor type = primary processor (0)
family = 0xf (15)
- model = 0x1 (1)
- stepping id = 0x1 (1)
+ model = 0x0 (0)
+ stepping id = 0x2 (2)
extended family = 0xa (10)
- extended model = 0x1 (1)
+ extended model = 0xa (10)
(family synth) = 0x19 (25)
- (model synth) = 0x11 (17)
- (simple synth) = AMD EPYC (4th Gen) (Genoa B1) [Zen 4], 5nm
+ (model synth) = 0xa0 (160)
+ (simple synth) = AMD Ryzen (Bergamo) [Zen 4c], 5nm
miscellaneous (1/ebx):
- process local APIC physical ID = 0x10 (16)
- maximum IDs for CPUs in pkg = 0x40 (64)
+ process local APIC physical ID = 0xd6 (214)
+ maximum IDs for CPUs in pkg = 0xff (255)
CLFLUSH line size = 0x8 (8)
brand index = 0x0 (0)
brand id = 0x00 (0): unknown
@@ -80,7 +80,7 @@
RDRAND instruction = true
hypervisor guest status = false
cache and TLB information (2):
- processor serial number = 00A1-0F11-0000-0000-0000-0000
+ processor serial number = 00AA-0F02-0000-0000-0000-0000
deterministic cache parameters (4):
--- cache 0 ---
cache type = no more caches (0)
@@ -287,7 +287,7 @@
bit width of fixed counters = 0x0 (0)
anythread deprecation = false
x2APIC features / processor topology (0xb):
- extended APIC ID = 16
+ extended APIC ID = 214
--- level 0 ---
level number = 0x0 (0)
level type = thread (1)
@@ -296,8 +296,8 @@
--- level 1 ---
level number = 0x1 (1)
level type = core (2)
- bit width of level & previous levels = 0x6 (6)
- number of logical processors at level = 0x40 (64)
+ bit width of level & previous levels = 0x8 (8)
+ number of logical processors at level = 0x100 (256)
--- level 2 ---
level number = 0x2 (2)
level type = invalid (0)
@@ -401,13 +401,13 @@
highest COS number supported = 0xf (15)
extended processor signature (0x80000001/eax):
family/generation = 0xf (15)
- model = 0x1 (1)
- stepping id = 0x1 (1)
+ model = 0x0 (0)
+ stepping id = 0x2 (2)
extended family = 0xa (10)
- extended model = 0x1 (1)
+ extended model = 0xa (10)
(family synth) = 0x19 (25)
- (model synth) = 0x11 (17)
- (simple synth) = AMD EPYC (4th Gen) (Genoa B1) [Zen 4], 5nm
+ (model synth) = 0xa0 (160)
+ (simple synth) = AMD Ryzen (Bergamo) [Zen 4c], 5nm
extended feature flags (0x80000001/edx):
x87 FPU on chip = true
virtual-8086 mode enhancement = true
@@ -469,7 +469,7 @@
LLC performance counter extensions = true
MWAITX/MONITORX supported = true
Address mask extension support = true
- brand = "AMD EPYC 9334 32-Core Processor "
+ brand = "AMD EPYC 9754 128-Core Processor "
L1 TLB/cache information: 2M/4M pages & L1 TLB (0x80000005/eax):
instruction # entries = 0x40 (64)
instruction associativity = 0xff (255)
@@ -509,7 +509,7 @@
line size (bytes) = 0x40 (64)
lines per tag = 0x1 (1)
associativity = 0x9 (9)
- size (in 512KB units) = 0x100 (256)
+ size (in 512KB units) = 0x200 (512)
RAS Capability (0x80000007/ebx):
MCA overflow recovery support = true
SUCCOR support = true
@@ -566,8 +566,8 @@
branch sampling feature support = false
(vuln to branch type confusion synth) = false
Size Identifiers (0x80000008/ecx):
- number of threads = 0x40 (64)
- ApicIdCoreIdSize = 0x6 (6)
+ number of threads = 0x100 (256)
+ ApicIdCoreIdSize = 0x8 (8)
performance time-stamp counter size = 40 bits (0)
Feature Extended Size (0x80000008/edx):
max page count for INVLPGB instruction = 0x7 (7)
@@ -714,13 +714,13 @@
line size in bytes = 0x40 (64)
physical line partitions = 0x1 (1)
number of ways = 0x10 (16)
- number of sets = 32768
+ number of sets = 16384
write-back invalidate = true
cache inclusive of lower levels = false
- (synth size) = 33554432 (32 MB)
- extended APIC ID = 16
+ (synth size) = 16777216 (16 MB)
+ extended APIC ID = 214
Core Identifiers (0x8000001e/ebx):
- core ID = 0x8 (8)
+ core ID = 0x6b (107)
threads per core = 0x2 (2)
Node Identifiers (0x8000001e/ecx):
node ID = 0x0 (0)
@@ -799,14 +799,14 @@
number of LBR stack entries = 0x10 (16)
number of avail Northbridge perf ctrs = 0x10 (16)
number of available UMC PMCs = 0x20 (32)
- active UMCs bitmask = 0x6db
+ active UMCs bitmask = 0xfff
Multi-Key Encrypted Memory Capabilities (0x80000023):
secure host multi-key memory support = true
number of encryption key IDs = 0x3f (63)
0x80000024 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
0x80000025 0x00: eax=0x00000000 ebx=0x00000000 ecx=0x00000000
edx=0x00000000
AMD Extended CPU Topology (0x80000026):
- extended APIC ID = 16
+ extended APIC ID = 214
--- level 0 ---
level number = 0x0 (0)
level type = core (1)
@@ -821,9 +821,9 @@
CMPXCHG8B = true
conditional move/compare = true
PREFETCH/PREFETCHW = true
- (multi-processing synth) = multi-core (c=32), hyper-threaded (t=2)
+ (multi-processing synth) = multi-core (c=128), hyper-threaded (t=2)
(multi-processing method) = AMD leaf 0xb
- (APIC widths synth): CORE_width=5 SMT_width=1
- (APIC synth): PKG_ID=0 CORE_ID=8 SMT_ID=0
- (uarch synth) = AMD Zen 4, 5nm
- (synth) = AMD EPYC (4th Gen) (Genoa B1) [Zen 4], 5nm
+ (APIC widths synth): CORE_width=7 SMT_width=1
+ (APIC synth): PKG_ID=0 CORE_ID=107 SMT_ID=0
+ (uarch synth) = AMD Zen 4c, 5nm
+ (synth) = AMD Ryzen (Bergamo) [Zen 4c], 5nm
Since that cpuid.d is mostly poking around these register values, I'm pretty
sure that the key to fixing this issue is hiding in here.
--
