I wonder what Zen 3 will give us? Apparently, this will be the last microarchitecture before AMD switches to DDR5 memory and new sockets. Zen 3 will be supported on motherboards with the 500 series chipsets.
Taken from Videocardz … A new listing of yet unreleased Zen3-based EPYC processor has been discovered. The data reveals the frequency configuration for the processor, but unfortunately, it does not reveal the core configuration. The sample codenamed 100-000000114-07_22/15_N would, therefore, feature a 1.5 GHz base clock and 2.2 GHz boost clock. The clock speed indicates it is likely just an early engineering sample. The previous generations of EPYC processors have also been seen with such clocks, but the final models were clocked much higher (around 3.4 GHz).
AMD Milan is also known as Genesis (internal codename), is the upcoming Zen3 EPYC series (likely to be called 7xx3), expected in late 2020. AMD has confirmed that the Milan-based EPYC series will ship “late 2020”.
AMD Zen3 EPYC processors will feature 7nm+ architecture, the changes will likely be reflected in performance per watt improvements, rather than in core design or core count.
Hit this issue on rhel8.3.0-av Milan hosts when hotplug vcpu into rhel8.3.0 guest:
[root@amd-milan-03 home]# /usr/libexec/qemu-kvm -cpu EPYC -device EPYC-x86_64-cpu,socket-id=1,core-id=0,thread-id=1,id=cpu1 -m 4096 -smp 1,threads=2,cores=1,sockets=3,maxcpus=6
qemu-kvm: -device EPYC-x86_64-cpu,socket-id=1,core-id=0,thread-id=1,id=cpu1: Invalid CPU [socket: 22009, die: 0, core: 0, thread: 1] with APIC ID 44019, valid index range 0:5
host version info:
kernel-4.18.0-202.el8.x86_64&qemu-kvm-5.0.0-0.module+el8.3.0+6620+5d5e1420.x86_64
host cpu info:
model name : AMD Eng Sample: 100-000000114-07_22/15_N
Source: Videocardz, ExecutableFix