Ryzen/Threadripper PSA: Core Numberings and Assignments
Hi everyone,
For those of you using a Threadripper build, or any recent AMD CPU, you may have concerns with the Infinity Fabric induced latency between CCXs, and further latency between dies. I dug through multiple posts to try and find exactly what cores were associated with what CCX/die, and after finding insufficient info, decided to ask AMD and my motherboard supplier, Gigabyte.
For those of you who had not seen the informative post on AMD's latency tests, it has bee
A person on reddit told me the answer to my problem. If you do the below QEMU provides EPYC instead and all the cache is right. It dropped latency accrossed the board. L3 is down to 13ns and l1-1ns l2-2-3ns. Machine seems MUCH more responsive. Should also mention they said they had updated their kernel and a patch on QEMU made theirs see it properly without this code so hopefully we will see it on unraid as well.
<cpu mode='custom' match='exact' check='partial'>
<model