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Date:      Wed, 22 Oct 2025 22:46:50 +0200
From:      Peter Eriksson <pen@lysator.liu.se>
To:        Rick Macklem <rick.macklem@gmail.com>
Cc:        FreeBSD CURRENT <freebsd-current@freebsd.org>, Garrett Wollman <wollman@bimajority.org>, Alexander Motin <mav@freebsd.org>
Subject:   Re: RFC: How ZFS handles arc memory use
Message-ID:  <F848B1F3-DE79-49D3-8D1C-1CB1BB2055E3@lysator.liu.se>
In-Reply-To: <CAM5tNy5b3=04zC84Q_c60A9qssZTEY2n73okXoFPeT%2BYSK25JQ@mail.gmail.com>

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[-- Attachment #1 --]
I too am seeing this issue with some of our FreeBSD 14.n running “backup” servers. However they are not NFS servers - they are rsync targets backing up the user-facing NFS(&SMB) servers. 

Every now and then (once a month) I see the load numbers spiking and disk I/O going thru the roof - and then performance grinds to a virtual halt (responds extremely slowly to shells/console I/O) for many hours, before it resolves itself (partly). A reboot fixes the issue better though, and then it runs fine for a couple of months before it happens again.

Our user-facing (NFS & SMB-serving) servers are all still running FreeBSD 13.x though in order to avoid running into this issue - but eventually we will be forced to upgrade to 14 when 13 gets EOLd next year (so it would be nice if this issue could be fixed before that :-)... 

Our 14.3-running servers involved have each 512-768GB of RAM, many many (22k on one 111k on the other) ZFS filesystems and many files and directories (somewhere around 1G on one 2.5G on the other). 

I’ve seen some posts that this issue (or something similar) has been seen in the Linux world too and there is (I think) was related to inodes/vnodes directory caching causing pinned memory being allocated that couldn’t be released easily - and since my rsync backup servers will scan all files/directories when doing backups this sounds plausible…

Here’s a graf showing some measurements when this happens - the grafs aren’t perfectly aligned but things starts at 22:00 when the backups start - when the load number starts to spike, and at the same time something causes the vfs_numvnodes counter to drop drastically. The ZFS memory usage doesn’t seem to be happening much at that time though… We measure a lot of different values so let me know if there’s some other number someone would like so see :-)


[-- Attachment #2 --]
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[-- Attachment #3 --]


- Peter

> On 22 Oct 2025, at 16:34, Rick Macklem <rick.macklem@gmail.com> wrote:
> 
> Hi,
> 
> A couple of people have reported problems with NFS servers,
> where essentially all of the system's memory gets exhausted.
> They see the problem on 14.n FreeBSD servers (which use the
> newer ZFS code) but not on 13.n servers.
> 
> I am trying to learn how ZFS handles arc memory use to try
> and figure out what can be done about this problem.
> 
> I know nothing about ZFS internals or UMA(9) internals,
> so I could be way off, but here is what I think is happening.
> (Please correct me on this.)
> 
> The L1ARC uses uma_zalloc_arg()/uma_zfree_arg() to allocate
> the arc memory. The zones are created using uma_zcreate(),
> so they are regular zones. This means the pages are coming
> from a slab in a keg, which are wired pages.
> 
> The only time the size of the slab/keg will be reduced by ZFS
> is when it calls uma_zone_reclaim(.., UMA_RECLAIM_DRAIN),
> which is called by arc_reap_cb(), triggered by arc_reap_cb_check().
> 
> arc_reap_cb_check() uses arc_available_memory() and triggers
> arc_reap_cb() when arc_available_memory() returns a negative
> value.
> 
> arc_available_memory() returns a negative value when
> zfs_arc_free_target (vfs.zfs.arc.free_target) is greater than freemem.
> (By default, zfs_arc_free_target is set to vm_cnt.v_free_taget.)
> 
> Does all of the above sound about right?
> 
> This leads me to...
> - zfs_arc_free_target (vfs.zfs.arc.free_target) needs to be larger
> or
> - Most of the wired pages in the slab are per-cpu,
>  so the uma_zone_reclaim() needs to UMA_RECLAIM_DRAIN_CPU
>  on some systems. (Not the small test systems I have, where I
>  cannot reproduce the problem.)
> or
> - uma_zone_reclaim() needs to be called under other
>  circumstances.
> or
> - ???
> 
> How can you tell if a keg/slab is per-cpu?
> (For my simple test system, I only see "UMA Slabs 0:" and
> "UMA Slabs 1:". It looks like UMA Slabs 0: is being used for
> ZFS arc allocation for this simple test system.)
> 
> Hopefully folk who understand ZFS arc allocation or UMA
> can jump in and help out, rick

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