On Wed, Mar 24, 2021 at 4:29 AM John Mellor <john.mel...@gmail.com> wrote:
>
> With Fedora being intended as a desktop platform, why are these settings
> not the default?
>
> The highest priority for a desktop system is to keep the user experience
> flowing smoothly, not to maximize disk i/o rates.
>
> Can this be fixed in time for F34?  Do we need a bug report?

Post to devel@ or desktop@ lists, is my advice. If you convince
Workstation edition folks, it'll certainly get more attention on
devel@ once it's a feature/change request.

It might be appropriate to set dirty_bytes to 500M across the board,
desktop and server. And dirty_background to 1/4 that. But all of these
are kinda rudimentary guides. What we really want is something that
knows what the throughput of the storage is, and is making sure there
isn't more than a few seconds of writeback needed at any given time.

The default, dirty_ratio 20%, is high by today's memory standards. But
upstream will not change it. All kernel knobs are distro
responsibility to change from the defaults.

I'm the first person to poo poo benchmarks. But if you run all of
them, it should be pretty easy to show whether it's generally useful,
or generally not useful (i.e. either bad or ambiguous) to change it.


-- 
Chris Murphy
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