Re: "failed to reclaim memory" with much free physmem

<<On Wed, 22 Oct 2025 11:45:54 -0400, Mark Johnston <markj@freebsd.org> said:

> On Tue, Sep 16, 2025 at 09:33:26PM -0400, Garrett Wollman wrote:

>> As with previous failures, this one was with plenty of physical memory
>> seemingly available (20 GiB out of 96 GiB).  Separate swap partition,
>> of course, and after 34 minutes memory allocation is pretty much back
>> to where it was before the crash.

> Sorry to chime in late.  Is this a NUMA system by any chance?  That is,
> what does sysctl vm.ndomains report?

It's hard to roll back my short-term memory to where it was a month
ago, but I checked several of our NFS servers of various vintages
(some old and small, some new) and all of them show vm.ndomains == 2.

Correction: one of them, a newer AMD server which hasn't crashed in
this way, has vm.ndomains == 1.  I suppose it may be a single-socket
system, given that it's weird in a bunch of other ways.

-GAWollman