On Wed, Jul 8, 2020 at 1:45 PM Matthew Miller <mat...@fedoraproject.org> wrote:
> On Wed, Jul 08, 2020 at 11:37:11AM -0600, Chris Murphy wrote:
> > If it's the center, I think that favors the mount option approach and
> > do it with the lowest level of compression, i.e. zstd:1. But this
> > suggests more benchmarking still, to make certain it's well understood
> > what the range of write performance hit could be in those scenarios.
> > Whereas the curated approach can just bypass most of that question -
> > the payload and workload for flatpak and usr and containers is fairly
> > fixed across all Fedora users rather than mixed content and workloads
> > found in ~/
> I just did some quick tests out of curiousity. I tarred up /usr on my
> system, resulting in a 9.8GB file. Ran this in my home dir on a
> run-of-the-mill Western Digital SSD.

Btrfs uses a cheap entropy estimator to decide if it should even try
to compress blocks. So it won't always do it. Hence results like this:

$ sudo compsize /usr
Processed 204133 files, 108496 regular extents (114715 refs), 101700 inline.
Type       Perc     Disk Usage   Uncompressed Referenced
TOTAL       57%      3.2G         5.7G         6.2G
none       100%      1.8G         1.8G         1.9G
zstd        36%      1.3G         3.8G         4.3G

Chris Murphy
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