[Bug 181565] [swap] Problem with vnode-backed swap space.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=181565

Mark Millard <markmi at dsl-only.net> changed:

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                 CC|                            |markmi at dsl-only.net

--- Comment #4 from Mark Millard <markmi at dsl-only.net> ---
FYI: See

Bug 206048 - 11.0-CURRENT -r293227 (and others) arm (rpi2/BeagleBone Black)
amd64 etc: swapfile usage hangs; swap partition works

for a problem that may apply to 10.x as well when using things like:

file=/var/spool/swap/swapfile
file=/swap0

--unless those files are on their own file systems/partitions not used for
other (used) files. (A swap file by itself on its own partition/file system has
not shown the problem. Mixing with other IO from the same file system/partition
does. But only so much information can be put in a subject line.)

It may be worth testing if the involved 10.x context(s) hang before settling on
this sort of placement of the file. One of the comments suggested a command
like:

stress -d 2 -m 3 --vm-keep

was sufficient to show the problem on at least 11.0-CURRENT amd64 contexts. I
guess that command is from the port sysutils/stress .

It would actually be good to have 10.x comments in Bug 206048 reporting how
such testing went if someone tries it.

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