Re: I would like to propose that we turn on XFS Reflink in Fedora 29 by default

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On 4/30/18 1:16 PM, Neal Gompa wrote:
> On Mon, Apr 30, 2018 at 2:14 PM Jason L Tibbitts III <tibbs@xxxxxxxxxxx>
> wrote:
> 
>>>>>>> "CW" == Colin Walters <walters@xxxxxxxxxx> writes:
> 
>> CW> I'd say it makes sense to revisit the default here globally in
>> CW> Anaconda.
> 
>> Maybe.  Have the issues which made XFS less suitable for use on laptops
>> been resolved?  The primary one I recall was that each mounted
>> filesystem would have a corresponding kernel thread doing about 20
>> wakeups per second.  This was not really good for battery life and power
>> consumption in general.
> 
>> Last I checked (which was 2016 or so) those wakeups were slated to be
>> around for a while longer.
>> https://www.spinics.net/lists/xfs/msg40210.html

As we discussed on IRC, I think idle filesystems won't get these wakeups;
if this is still a concern, investigation of the actual effects on battery
life (if any) are recommended.

> 
> And there's still the fun restriction of XFS not being able to shrink. It's
> not particularly important in the server case, but in the desktop/laptop
> case, it happens enough in my experience that I'm not sure I'd want a
> default filesystem that can't shrink.

XFS realistically is not going to get shrink.  Fedora will need to decide if
the other capabilities & features outweigh the lack of shrink capability.

-Eric
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