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Date:      Thu, 04 Jan 2018 08:24:25 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-ppc@FreeBSD.org
Subject:   [Bug 224841] Power64 regression: Machine does not boot anymore
Message-ID:  <bug-224841-21-LhPVgHNRAB@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-224841-21@https.bugs.freebsd.org/bugzilla/>
References:  <bug-224841-21@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D224841

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

           What    |Removed                     |Added
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                 CC|                            |markmi@dsl-only.net

--- Comment #10 from Mark Millard <markmi@dsl-only.net> ---
(In reply to Gustavo Romero from comment #9)

Having FreeBSD hang around:

Trying to mount root from ufs:/dev/da0s2a [rw]...

might be tied to the following. . .

Hanging here is something addressed by the
"UMA limit" part of head -r327485 . Bugzilla
224330 has material about it. As I understand
-r326347 is what broke that specific aspect
of things. (It had other issues as well,
and apparently causes some other problem to
show up that was previous hidden.)

As for -r327485:

Author: jeff
Date: Tue Jan  2 04:35:56 2018
New Revision: 327485
URL:=20
https://svnweb.freebsd.org/changeset/base/327485


Log:
 Fix arc after r326347 broke various memory limit queries.  Use UMA features
 rather than kmem arena size to determine available memory.

 Initialize the UMA limit to LONG_MAX to avoid spurious wakeups on boot bef=
ore
 the real limit is set.

 PR:            224330 (partial), 224080
 Reviewed by:   markj, avg
 Sponsored by:  Netflix / Dell EMC Isilon
 Differential Revision:=20
https://reviews.freebsd.org/D13494
. . .


The "arc" reference is a ZFS file system handling issue.

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