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Date:      Mon, 21 Sep 2020 16:02:14 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 246886] [sendfile] Nginx + NFS or FUSE causes VM stall
Message-ID:  <bug-246886-227-XauHWnRywQ@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-246886-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-246886-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D246886

--- Comment #45 from Gleb Smirnoff <glebius@FreeBSD.org> ---
I had faced this problem with 12.1-RELEASE and NFS. I contacted rmacklem@ b=
ut
he wasn't able to provide help.

I am absolutely sure this isn't a general sendfile problem, but specific to
NFS. It is possible that FUSE also has it.

FFS definitely doesn't have this problem given amount of use it has.

This looks like a missing wakeup on a page after it is filled.

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