[systemd-bugs] [Bug 70967] New: Performance regression from cgroup refactoring makes dense boxes nearly unbootable

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70967

          Priority: medium
            Bug ID: 70967
          Assignee: systemd-bugs at lists.freedesktop.org
           Summary: Performance regression from cgroup refactoring makes
                    dense boxes nearly unbootable
        QA Contact: systemd-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: Linux (All)
          Reporter: david at davidstrauss.net
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: general
           Product: systemd

Having at least few thousand units can add hours to boot time.

We don't have any firm answers yet, but there's a thread here:
http://lists.freedesktop.org/archives/systemd-devel/2013-October/013765.html

It looks like the worst case is a Xen VM because of hypervisor memory
management interaction. Like the bottleneck with daemon-reload, key problems
seem to be with hashmap_iterate. We've mostly tested with v208, but the changes
occurred in v205, the first version to ship after Fedora 19.

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