Re: Fedora 33 System-Wide Change proposal: swap on zram

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On Fri, Jun 5, 2020 at 1:07 PM John M. Harris Jr <johnmh@xxxxxxxxxxxxx> wrote:
>
> On Friday, June 5, 2020 11:48:14 AM MST Chris Murphy wrote:
> > On Fri, Jun 5, 2020 at 6:43 AM Michael Catanzaro <mcatanzaro@xxxxxxxxx>
> > wrote:
> > >
> > >
> > > On Fri, Jun 5, 2020 at 1:52 am, Chris Murphy <lists@xxxxxxxxxxxxxxxxx>
> > > wrote:
> > >
> > > > That is the plan, otherwise the swap-on-zram device probably never
> > > > gets used. And then its overhead, which is small but not zero, is just
> > > > a waste.
> > >
> > >
> > >
> > > I thought the plan was to get rid of the disk-based swap partition,
> > > since it has an unacceptable impact on system responsiveness?
> >
> >
> > Default new installations, yes. No disk-based swap partition.
> >
> > For upgrades, there's no mechanism to remove an existing
> > swap-on-drive. And the installer will still permit swap-on-drive being
> > added in custom partitioning. Both of these paths results in two swap
> > devices.
> >
> > We could ask Anaconda, if a custom installation creates swap-on-disk,
> > to remove /etc/systemd/zram-generator.conf. And in that case, users
> > will not get swap-on-zram. And we could also forgo the change being
> > applied on upgrades.
>
> It may be best to respect the user's decision, and not add a zram device on
> upgraded systems. This would lead to less unexpected behavior. I'd support
> that, for sure :)

Contra argument: It also leads to fragmentation of the user base. Most
users use a distribution because they trust the decisions. And while
it is only a preference, not a policy the Workstation Product
Requirements Document says  "Upgrading the system multiple times
through the upgrade process should give a result that is the same as
an original install of Fedora Workstation."

There is a balancing act here that should be considered because a
large percent of Fedora users upgrade rather than reprovision. It
might even be the majority case.


-- 
Chris Murphy
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