This bug was fixed in the package zfs-linux - 0.8.3-1ubuntu12.15
---
zfs-linux (0.8.3-1ubuntu12.15) focal; urgency=medium
* Fix zfs_arc_max getting ignored when value below allmem/32 (LP: #1964992)
- d/p/4930-Dont-ignore-zfs_arc_max-below-allmem-32.patch
-
Hello everyone,
I was able to confirm the fix for focal using the test case from the
description:
root@zfs-test:~$ free -h
totalusedfree shared buff/cache available
Mem: 31Gi 247Mi30Gi 1.0Mi 352Mi30Gi
Swap:
zfs-linux FTBS on riscv64, but that's been the case for the versions
from -updates for some time now. It's not related to this upload, but
rather to the ZFS version in focal not supporting riscv64:
In file included from ../../lib/libspl/include/sys/types.h:36,
from
** Tags added: verification-needed-focal
** Tags added: se-sponsor-halves
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https://bugs.launchpad.net/bugs/1964992
Title:
ZFS ignores ARC sizes below allmem/32
Hello Heitor, or anyone else affected,
Accepted zfs-linux into focal-proposed. The package will build now and
be available at https://launchpad.net/ubuntu/+source/zfs-
linux/0.8.3-1ubuntu12.15 in a few hours, and then in the -proposed
repository.
Please help us by testing this new package. See
Thank you for the v2, Ghadi! I made some minor modifications to your
changelog entry (added "d/p/" before the patch files), and included a
"backport-notes:" tag in your second patch mentioning the FreeBSD-
specific sections were dropped from upstream.
With the v2, I ran the regression tests again
** Patch added: "zfs-linux_0.8.3-1ubuntu12.15_v2.debdiff"
https://bugs.launchpad.net/ubuntu/focal/+source/zfs-linux/+bug/1964992/+attachment/5655892/+files/zfs-linux_0.8.3-1ubuntu12.15_v2.debdiff
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Thanks, Dimitri! I've tested Ghadi's patches and confirmed they work and
don't trigger any regressions in the ZFS test suite.
I've asked Ghadi to rework some portions of his backport in order to be closer
to the upstream patches though, so we should have a v2 soon. We'll make sure
that previous
Editing 0.8.3-1ubuntu12.14 changelog seems inappropriate. Whoever is
sponsoring this debdiff, should drop that hung, as long as it doesn't
have any other mistakes.
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Hello, I just wanted to clarify the changes in the two commits that were
backported.
For commit 36a6e2335c45, the main features that were backported were the
warnings generated when ARC fails to set the max and min value to the user
specified values. Although this commit has a fix for the
** Description changed:
[Impact]
ZFS ignores tunable "zfs_arc_max" due to it being below allmem/32 threshold.
This prevents users from properly restraining ARC sizes, and can cause
increased memory contention in some systems.
[Test Plan]
1. Deploy test system with ZFS storage and
** Patch added: "zfs-linux_0.8.3-1ubuntu12.15.debdiff"
https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1964992/+attachment/5641946/+files/zfs-linux_0.8.3-1ubuntu12.15.debdiff
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** Patch removed: "lp1964992-focal.debdiff"
https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1964992/+attachment/5571326/+files/lp1964992-focal.debdiff
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** Changed in: zfs-linux (Ubuntu Focal)
Assignee: Heitor Alves de Siqueira (halves) => Ghadi Rahme (ghadi-rahme)
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https://bugs.launchpad.net/bugs/1964992
Title:
No worries, thank you for the patience, Robie!
With further testing, we've found out that there's an additional upstream
patch required for Focal, which fixes the "inversion" when setting the ARC
limits.
I'll amend the description and re-spin this SRU to include the proper
fixes. I'll then
(and please re-upload when ready - the SRU team won't notice to respond
otherwise)
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https://bugs.launchpad.net/bugs/1964992
Title:
ZFS ignores ARC sizes below
As there's been no response, I'm cleaning this up from the queue. This
can still be fixed in Focal, but see the comments above on what needs to
be resolved first.
** Changed in: zfs-linux (Ubuntu Focal)
Status: Incomplete => Triaged
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The correct logic shouldn't be hard to write, unless I'm missing
something? So can we just do it right, and as soon as is necessary? If
it's obviously correct, I don't think we need to wait for upstream
acceptance, but equally it shouldn't take them long to review it either.
Because the parameters
Hey Heitor! Thank you for following up on Robie's questions. As this is
a bug in the current upstream versions of zfs-linux + currently LTS
upgrades to jammy are enabled, I'm starting to lean towards getting this
accepted into focal-proposed. Out of curiosity, what is the situation on
bionic btw.?
Hi Robie,
You're right, the patch does essentially invert the problem. This is
still the behavior upstream, and it currently works like you mentioned:
if the user tries to set a min above the default max (ramsize/2), it
fails.
I'm working on a patch to propose upstream that should fix this. We
** Patch added: "lp1964992-focal.debdiff"
https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1964992/+attachment/5571326/+files/lp1964992-focal.debdiff
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This doesn't seem to be reproducible in Bionic, marking it as fixed
accordingly.
** Changed in: zfs-linux (Ubuntu Bionic)
Status: Confirmed => Fix Released
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