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systemd-243-rc2

New release of systemd is now building in rawhide and branched.
Two important changes:
- The unified cgroup hierarchy (cgroupsv2) is now the default.
Use systemd.unified-cgroup-hierarchy=0 on the kernel command line to
undo this change.
[https://fedoraproject.org/wiki/Changes/CGroupsV2]
- BFQ is used as the default scheduler for disks, mmc cards, etc.
[https://bugzilla.redhat.com/show_bug.cgi?id=1738828]

There's a bunch of fixes too since -rc1, in particular in systemd-networkd.
Enjoy!

Zbyszek

Comments

Re: systemd-243-rc2

By zfnoctis at 08/22/2019 - 13:44

[1] <a href="https://github.com/systemd/systemd/pull/13321/commits/5ab4d083dbe0a1ae095875c4af6ac26749b67211" title="https://github.com/systemd/systemd/pull/13321/commits/5ab4d083dbe0a1ae095875c4af6ac26749b67211">https://github.com/systemd/systemd/pull/13321/commits/5ab4d083dbe0a1ae09...</a>

Re: systemd-243-rc2

By Tomasz Torcz at 08/22/2019 - 14:07

On Thu, Aug 22, 2019 at 05:44:13PM -0000, <a href="mailto: ... at gmail dot com"> ... at gmail dot com</a> wrote:
Yes, you're looking at the wrong patch. Setting BFQ is a downstream
decision:
<a href="https://src.fedoraproject.org/rpms/systemd/blob/d7b2d46533ca7c2a2b9092ff9ef0dae12cdb3ef2/f/464a73411c13596a130a7a8f0ac00ca728e5f69e.patch" title="https://src.fedoraproject.org/rpms/systemd/blob/d7b2d46533ca7c2a2b9092ff9ef0dae12cdb3ef2/f/464a73411c13596a130a7a8f0ac00ca728e5f69e.patch">https://src.fedoraproject.org/rpms/systemd/blob/d7b2d46533ca7c2a2b9092ff...</a>

Re: systemd-243-rc2

By zfnoctis at 08/22/2019 - 15:04

Thanks, so it looks like virtio and xen pv block devices (vd* and xvd*) will stick with mq-deadline on Fedora.

Re: systemd-243-rc2

By Tom Hughes at 08/22/2019 - 09:09

Looking at the patch you're applying it looks like NVME disks
are not currently included - was that deliberate?

I realise considerations may be different for SSDs but SATA SSDs
do seem to be included and the bug explicitly mentions it as being
suitable for SSDs.

Tom

Re: systemd-243-rc2

By Zbigniew =?utf-... at 08/22/2019 - 11:04

On Thu, Aug 22, 2019 at 02:09:03PM +0100, Tom Hughes wrote:
Yep. BFQ maintainer said:
See <a href="https://github.com/systemd/systemd/pull/13321" title="https://github.com/systemd/systemd/pull/13321">https://github.com/systemd/systemd/pull/13321</a> for the full
discussion.

If this experiment gives positive results, we can easily extending the
rule to cover more devices.

Zbyszek