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Date:      Mon, 19 Dec 2022 21:21:35 +0000
From:      bugzilla-noreply@freebsd.org
To:        fs@FreeBSD.org
Subject:   [Bug 266302] [zfs][iscsi] Periodic drops by ctl with "failed to allocate soft PDU" since 13.1
Message-ID:  <bug-266302-3630-0tPX0hjML3@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-266302-3630@https.bugs.freebsd.org/bugzilla/>
References:  <bug-266302-3630@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D266302

John Baldwin <jhb@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jhb@FreeBSD.org,
                   |                            |mav@FreeBSD.org,
                   |                            |trasz@FreeBSD.org

--- Comment #1 from John Baldwin <jhb@FreeBSD.org> ---
This message means that an internal call to uma_zalloc to allocate a PDU
structure failed on the server side.  This just means that your server is u=
nder
memory pressure, but that it handled that condition gracefully.  You might
monitoring the memory usage for the "icl_soft_pdu" zone in vmstat -z output=
 to
see if it seems like it is growing super large.  Alternatively, it might be
that you need to set a limit on the growth of the ZFS ARC to leave enough R=
AM
free for your existing iSCSI connections.  Limiting the ARC might have effe=
cts
on other workloads, so you'd have to decide how to balance that based on yo=
ur
needs.

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