On Wed, Jun 17, 2020 at 12:05 PM Richard Shaw <hobbes1...@gmail.com> wrote:
>
> I didn't get any response from the EPEL list so forwarding here since the 
> change was discussed here anyway...
> ---
>
> So with the discussion about moving to zram for swap on Fedora I wondered if 
> it was worth taking a look at for my CentOS 8 machine.
>
> I noticed that there was a build in Koji but it was deleted. Figuring there 
> was a reason but as yet undeterred I checked out master and built an el8 rpm.
>
> Installed on my CentOS 8 machine and tried to start it up... Definitely 
> broken somehow.
>
> Figured out that it didn't like the command that created the zram (zramctl). 
> Turns out that (and this is a guess), that the kernel in CentOS doesn't 
> support lz4 compression. In fact none of the compression options worked 
> except "deflate". Not sure what the compression ratio is for it but I now 
> have zram using it.

zramctl and lz4 are used by the 'zram' package in Fedora - but are not
used by the 'rust-zram-generator' package, which is the meta package
to search for in koji, that's part of the swap-on-zram feature
proposal. So it might be possible you have the wrong package? The
zram-generator currently uses lzo-rle.

> Second problem is that the configuration options in /etc/zram.conf seemed to 
> be ignored.

Yep again this is for the 'zram' package, which the plan is to
obsolete in favor of zram-generator.

Also, there are some changes coming to make zram-generator
configuration more like what folks expect from systemd configurations
generally - i.e. that the default configuration will be in /usr and
user override will be in /etc. The feature proposal will be updated to
reflect these changes. Sorry for the confusion, but working through
and reducing confusion, are a fair part of the tasks for this feature.

I am aware of the irony: So this guy is proposing a feature that
introduces yet another way of enabling swap on zram, while saying
there are too many swap on zram implementations! Who is this
comedian?! Cuz he's not very funny!


-- 
Chris Murphy
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