Re: F38 proposal: Shorter Shutdown Timer (System-Wide Change proposal)

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On Thu, Dec 22, 2022, at 12:35 PM, Ben Cotton wrote:
> https://fedoraproject.org/wiki/Changes/Shorter_Shutdown_Timer
>
> This document represents a proposed Change. As part of the Changes
> process, proposals are publicly announced in order to receive
> community feedback. This proposal will only be implemented if approved
> by the Fedora Engineering Steering Committee.
>
> == Summary ==
> A downstream configuration change to reduce the systemd unit timeout
> from 2 minutes to 15 seconds.

A problem I've seen in the past is that timeouts like this have very different effects on slow/heavily loaded systems.  For example, an OpenStack environment that has relatively slow storage (or a public cloud environment without provisioned IOPS).  Or a bare metal server that is loaded to the limit.

The effect of a 15 second timeout in those scenarios is wildly different from that of a relatively idle desktop system with a SSD or modern NVMe drive.

DBus for example defaults to a 25 second timeout on method calls, and I've seen problems like the above there.

Ideally, we'd have a mechanism to define timeouts like this somehow relative to system speed (throughput) not simple wall clock time.

That said, I think the simplest is for this change to only apply to desktop systems.
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