On 10/1/18 10:14 AM, Andrew Gallatin wrote:
Author: gallatin
Date: Mon Oct 1 14:14:21 2018
New Revision: 339043
URL:
https://urldefense.proofpoint.com/v2/url?u=https-3A__svnweb.freebsd.org_changeset_base_339043&d=DwIDaQ&c=imBPVzF25OnBgGmVOlcsiEgHoG1i6YHLR0Sj_gZ4adc&r=Ed-falealxPeqc22ehgAUCLh8zlZbibZLSMWJeZro4A&m=vFxrWMxnRsVgXYUUeDU3mY3EdLAlur-SanLWzMxFWow&s=a6s6FleHIdYhZF1D_SqEOf9apgxdQ2RBvF0HcKicCus&e=
Log:
Allow empty NUMA memory domains to support Threadripper2
The AMD Threadripper 2990WX is basically a slightly crippled Epyc.
Rather than having 4 memory controllers, one per NUMA domain, it has
only 2 memory controllers enabled. This means that only 2 of the
4 NUMA domains can be populated with physical memory, and the
others are empty.
Add support to FreeBSD for empty NUMA domains by:
- creating empty memory domains when parsing the SRAT table,
rather than failing to parse the table
- not running the pageout deamon threads in empty domains
- adding defensive code to UMA to avoid allocating from empty domains
- adding defensive code to cpuset to avoid binding to an empty domain
Thanks to Jeff for suggesting this strategy.
Reviewed by: alc, markj
Approved by: re (gjb@)
Differential Revision: https://reviews.freebsd.org/D1683
Whoops, cut-and-paste error. The Differential Revision should have
been: https://reviews.freebsd.org/D16836
Drew
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