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

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Samuel Sieb wrote:
> See, this is a clear indication that you don't understand what it is
> doing and weren't listening to the various people trying to explain it.
> It is definitely not a placebo.  I gave zram 5G out of the 12G I have
> and my laptop is performing way better now.  It's not thrashing the disk
> (SSD) every time I switch desktops or windows.

If you are always running out of RAM with 12 GiB, you need to look into the 
applications you are running. I have a notebook with 4 GiB RAM and 8 GiB 
swap and it is usable with Fedora (KDE Spin), Plasma, and some applications. 
Are you running only standard desktop applications or some memory-intensive 
simulations or something?

> Due to the number and size of applications I'm running, I normally have to
> close Thunderbird when I want to run Chrome.  But now I can start Chrome
> up with no problem.

Wow. I am running Trojitá (IMAP mail) and Falkon (web browser) right now, 
plus Konversation (IRC) and KNode (NNTP, in which I am writing this message 
right now), and KSensors reports 2096 MiB of RAM and 0 MiB of swap used. So 
what is using so much RAM? Are Thunderbird and Chrome so memory-hungry or is 
it the other applications you are running? (Which ones?)

> Swap is never used as buffer or cache, that doesn't even make sense.
> Buffer is storing data before writing it to disk and cache is keeping
> hot data somewhere with fast access.  Why do you use so much swap on
> your servers?  The linear correlation with RAM is an obsolete idea and
> was only somewhat valid when memory sizes were smaller.  If you're using
> any significant fraction of that swap space, your server is in trouble.

He actually has much less swap set up than I do. Not even half his RAM. I 
just stick to twice the RAM, because taking 16 GiB away from a 3 TB RAID1 to 
make room for a 32 GiB RAID0 swap is not going to make any practical 
difference.

        Kevin Kofler
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