Filesystem operations slower in 13.0 than 12.2

[Mark Millard]

Konstantin Belousov kostikbel at gmail.com wrote on
Fri Mar 5 23:12:13 UTC 2021 :

> On Sat, Mar 06, 2021 at 12:27:55AM +0200, Christos Chatzaras wrote:
. . .
> > Command: /usr/bin/time -l portsnap extract (these tests done with 2 different idle servers but with same 4TB HDDs models)
> > 
> > FreeBSD 12.2p4
> > 
> >        99.45 real        34.90 user        59.63 sys
> >       100.00 real        34.91 user        59.97 sys
> >        82.95 real        35.98 user        60.68 sys
> > 
> > FreeBSD 13.0-RC1
> > 
> >       217.43 real        75.67 user       110.97 sys
> >       125.50 real        63.00 user        96.47 sys
> >       118.93 real        62.91 user        96.28 sys
> . . .
> In the portsnap results for 13RC1, the variance is too high to conclude
> anything, I think.

I'll note that there are other reports of wide variance
in transfer rates observed during an overall operation
such as "make extract". The one I'm thinking of is:

https://lists.freebsd.org/pipermail/freebsd-stable/2021-March/093251.html

which is an update to earlier reports, but based on more recent
stable/13. https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253968
comment 4 has some more notes about the context. The "make extract"
for firefox likely is not as complicated as the portsnap extract
example's execution structure.

Might be something to keep an eye on if there are on-going
examples of over time.

===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)