[Bug 223786] Remounting a UFS filesystem read-only takes very long time

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223786

Mikhail Teterin <mi at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |mi at FreeBSD.org

--- Comment #6 from Mikhail Teterin <mi at FreeBSD.org> ---
Seeing this manifested pretty bad today - on a freshly-rebuilt world
(r338291M). The other thing that changed is the RAM upgrade -- from 10GB to
40GB.

Could it be, the kernel is trying to flush ALL filesystems, rather than just
the one being remounted? Because, unlike the / on UFS, other filesystems could
be quite busy...

While waiting, I press Ctrl-T once in a while, and get:

root at narawntapu:/etc/mail (1022) mount -oro -u /
load: 0.93  cmd: mount 26321 [biowr] 230.01r 0.00u 9.01s 2% 2224k
load: 0.47  cmd: mount 26321 [biowr] 283.84r 0.00u 10.99s 1% 2224k
load: 0.57  cmd: mount 26321 [biowr] 318.95r 0.00u 12.25s 2% 2224k

The actual change to the /-filesystem is trivial.

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