[Bug 266302] [zfs][iscsi] Periodic drops by ctl with "failed to allocate soft PDU" since 13.1
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Date: Mon, 19 Dec 2022 21:21:35 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266302
John Baldwin <jhb@FreeBSD.org> changed:
What |Removed |Added
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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 under
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 RAM
free for your existing iSCSI connections. Limiting the ARC might have effects
on other workloads, so you'd have to decide how to balance that based on your
needs.
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