https://bugs.launchpad.net/cloud-images/+bug/2038894 is a related bug to
track specifically the introduction of listening port 5353
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There is a related bug @
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2036968 which might
have affected boot speed.
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Title:
@paelzer agreed. Good plan.
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Title:
Mantic (23.10) minimal images increase in memory consumption, port
usage and processes
@phil
As I said above for me it mostly was "I'm sure some change was expected, but so
much?".
It has various benefits as gladly outlined by Dimitri, fixing many
issues, but coming at a price tag.
Seeing how big the price tag is for small size, high density cases I
consider it potentially too
@paelzer given the above findings and discussion, I would like to mark
this as Invalid for cloud-images project and continue the conversation
in the context of kernel only. +1 / -1 ?
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Ah. I see. KSM_ENABLED=AUTO from /etc/default/qemu-kvm is used through
/usr/share/qemu/init/qemu-kvm-init via the qemu-kvm.service systemd
service. thanks for the hint!
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> it only gets activated when you install ksmtuned (which is not
installed by default).
No, installing qemu-system-... will also enable it.
So Seth gladly filed bug 2033565 to discuss and change this now or at least
towards 24.04.
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** Description changed:
- The Mantic (Ubuntu 23.10) images are undergoing some big changes prior
- to 23.10 release in October.
+ The Mantic (Ubuntu 23.10) download/qcow2 images available @
https://cloud-images.ubuntu.com/minimal/
+ are undergoing some big changes prior to 23.10 release in
@Seth,
ksm is disabled by default so it's still opt-in:
# cat /sys/kernel/mm/ksm/run
0
it only gets activated when you install ksmtuned (which is not installed
by default). So I think that's fine.
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> @paelzer Are you happy to adjust your regression testing/metrics gathering to
> increase the
> memory required knowing that it was a conscious decision to switch kernel and
> incur the
> performance hit for the benefit of using a kernel with more support and less
> reported bugs?
I am.
In
I have uploaded further data now to
https://people.canonical.com/~philroche/20230824-manticl-minimal-
LP2032933/server-metrics/ with kernelmodules, kernelconfig, services,
timers etc. for each of the three images being inspected. This
additional data was gathered with a modified fork of the
Is lxd / zfs now installed by default in the minimal images? It seems
like some zfs things are loaded by default.
Also counting processes alone, may or may not increase memory usage.
Example: having N agetty, doesn't actually have memory cost of each
individual agetty, does it?
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Additionally if something is built into the kernel that is optional at
runtime, and resource intensive, we can make it modularization. But not
sure that will win us anything if it gets autoloaded by default. Thus
maybe some of the things listed should also be blacklisted to prevent
auto-loading on
Separately, please do note that switch from kvm kernel to generic is
resolving the hundreds of bug reports of "works with generic / every
other cloud, doesn't work with kvm". Also note that probably the
baseline comparison shouldn't be the kvm kernel => as we know kvm kernel
has never provided
> +ksmd
I'm concerned about this change. Historically, the page-merging code has
allowed cross-VM snooping, including even recovery of GnuPG private
keys: https://eprint.iacr.org/2013/448.pdf
Unless something has changed to mitigate the cross-domain privacy leaks
in ksmd, it ought to be opt-in
@paelzer
> The change of the image build sadly combined it all
See the description noting
https://people.canonical.com/~philroche/20230824-manticl-minimal-
LP2032933/ which should help in determining where the changes were
introduced as I have provided three images across the various stages of
The diff in process count from kernel change image -> kernel change +
seed change image is actually a reduction in processes - see diff @
https://pastebin.ubuntu.com/p/PXtQM9gB2K/
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In the above tests from Christian, it's interesting to note the MemTotal
shrink by ~22MiB. Is this due to the higher NR_CPUS alone?
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IMHO: If it turns out unfixable, this at least needs to be a release
notes entry
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Title:
Mantic (23.10) minimal images increase in
One thing that came up when discussing with SMB as an obvious "uses mem
more in a kernel" are the structures needed per POSSIBLE cpu.
Comparing the system that I downgraded I found from [1]:
With the -kvm kernel before:
kernel: setup_percpu: NR_CPUS:64 nr_cpumask_bits:1 nr_cpu_ids:1
Checking kernels:
1. This already uses linux-image-virtual, it is not the even bigger
linux-image-generic.
2. The change of the image build sadly combined it all
a) new image build/seeding by CPC
b) different kernel type -kvm -> -virtual that uses generic
c) switch of kernel versions
We
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