You do realize that some of us have been using swap-on-zram for the best part of a decade, right?

It never required a systemd service, you just need an entry in /etc/modprobe.d (optional), an entry in fastab (optionl) and a script in /etc/sysconfig/modules (you can fold the other two I mentioned in here so it's in a single place).

At the beginning zram only used LZO compression, and was single-threaded, so we created one zram block device per CPU core, did mkswap on them and did swapon with equap priority on all of those swap devices.

I had this on on Fedora and later RSEL6 on my SheevaPlug Toshiba AC100 as far back as 2009, and I can't have been the only one.

In fact, this related ticket dates back to 2007, and I only got in on it in 2009:

https://bugzilla.redhat.com/show_bug.cgi?id=223722

Apparently that was a "can't fix" - worked for me since 2009 with the solution I attached to that ticket.

On Fri, Oct 12, 2018 at 4:47 PM Robert Moskowitz <rgm@htt-consult.com> wrote:

I have been working with Mark Verlinde, well actually he did the heavy
lifting, to port zram to Centos...

https://copr.fedorainfracloud.org/coprs/markvnl/zram-swap/

A few of us are actively using it.

Give it a try yourselves!

As it is noarch, it should work on all Centos7 arch.

On 10/7/18 1:06 PM, Robert Moskowitz wrote:
>
>
> On 10/7/18 11:57 AM, Pablo Sebastián Greco wrote:
>> Too many questions together... ;-)
>>
>> El 7/10/18 a las 08:58, Robert Moskowitz escribió:
>>> I have very recently learned about zram-swap. Fedora-29-arm is
>>> using it. It supposedly makes a considerable difference even over
>>> HD swap.
>> Do you have a link for me to read about that? I'd like to see some
>> numbers on performance, specially on the CPU, because small ARM
>> devices are not exactly fast to compress.
>
> You could ask on the Fedora-arm list where Peter Robinson (I believe
> he is part of the Fedora development with heavy presence in the arm
> work) recently explained, kind of, how F29-arm is using it.
>
>>>
>>> Since many (potential) users of Centos-arm do not have a ready HD,
>>> perhaps we can switch the image from a physical partition to zram?
>>> Or at least instructions to change to this on the wiki.
>> Switch might be difficult, but maybe generate a "tech preview"
>> alternative build.
>> This is the link to how we create the images, maybe you could send
>> me some changes to test
>> https://github.com/CentOS/sig-core-AltArch/tree/master/image_build
>
> Minimally in the wiki, how to switch from a partition swap to zram. I
> am working on learning more about it...
>
>
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