[Bug 222356] www/firefox: file-backed shared memory performance

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222356

--- Comment #6 from Tijl Coosemans <tijl at FreeBSD.org> ---
(In reply to Konstantin Belousov from comment #5)
Even with journaling disabled the final close still takes about 5 seconds of
continuous disk activity, exactly as long as calling write(2) with 128MiB.  And
if I set sz to 256MiB it takes 10 seconds.  Clearing an inode and updating a
few bitmaps shouldn't take that long.

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