Context: Ryzen Threadripper 1950X under Windows 10 Pro with Hyper-V (used to run FreeBSD).
In experimenting with switching a Threadripper 1950X to have ECC RAM I discovered: A) The maximum ECC memory it would put to use was 96 GiBytes (3 DIMMs on each side, a 4th on each side was recognized but was ignored/disabled if present). B) AMD Ryzen Master classified the 96 GiByte configurations (with or without the ignored DIMMs) as "Local" without an ability switch to "Distributed". C) The downloaded Windows CoreInfo.exe utility agreed on there being 2 NUMA nodes. D) As did the result of the User Hardware Topology button in the Hyper-V Processor > NUMA settings: On a single virtual non-uniform memory architecture node: Maximum number of processors : 16 Maximum amount of memory (MB) : 48070 Maximum NUMA nodes allowed on a socket: 2 Only 1 socket. E) The CoreInfo.exe quick "Approximate Cross-NUMA Node Access Cost (relative to fastest)" tends to show the 4 numbers varying from 1.0 to 1.7 when retried repeatedly. An oddity is that sometimes the 1.0's are between 00 and 01, in fact this seems usual, and normally at most one 1.0 exists. The 00 row seems to always have the smaller numbers. An example: 00 01 00: 1.2 1.0 01: 1.3 1.5 I had no original intent of playing with NUMA but I figured that the Threadripper could be configured for such, and even has configurations that apparently require such as far as AMD Ryzen Master is concerned, could be of interest and possible use for folks testing FreeBSD NUMA support. Since I'd done nothing to build a kernel with NUMA enabled, FreeBSD 12.0 under Hyper-V did not see the NUMA structure from (D). One thing that did show during booting was getting 4 lines of: "SRAT: Ignoring memory at addr" instead of 2. === Mark Millard marklmi26-fbsd at yahoo.com ( dsl-only.net went away in early 2018-Mar) _______________________________________________ email@example.com mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-amd64 To unsubscribe, send any mail to "freebsd-amd64-unsubscr...@freebsd.org"