Re: your mail

[M G Berberich <btrfs@oss.m-berberich.de>]

Am Donnerstag, den 01. September schrieb Austin S. Hemmelgarn:
> On 2016-09-01 03:44, M G Berberich wrote:
> > Am Mittwoch, den 31. August schrieb Fennec Fox:
> > > Linux Titanium 4.7.2-1-MANJARO #1 SMP PREEMPT Sun Aug 21 15:04:37 UTC
> > > 2016 x86_64 GNU/Linux
> > > btrfs-progs v4.7
> > > 
> > > Data, single: total=30.01GiB, used=18.95GiB
> > > System, single: total=4.00MiB, used=16.00KiB
> > > Metadata, single: total=1.01GiB, used=422.17MiB
> > > GlobalReserve, single: total=144.00MiB, used=0.00B
> > > 
> > > {02:50} Wed Aug 31
> > > [fennectech@Titanium ~]$  sudo fstrim -v /
> > > [sudo] password for fennectech:
> > > Sorry, try again.
> > > [sudo] password for fennectech:
> > > /: 99.8 GiB (107167244288 bytes) trimmed
> > > 
> > > {03:08} Wed Aug 31
> > > [fennectech@Titanium ~]$  sudo fstrim -v /
> > > [sudo] password for fennectech:
> > > /: 99.9 GiB (107262181376 bytes) trimmed
> > > 
> > >   I ran these commands minutes after echother ane each time it is
> > > trimming the entire free space
> > > 
> > > Anyone else seen this?   the filesystem is the root FS and is compressed
> > 
> > You should be very happy that it is trimming at all. Typical situation
> > on a used btrfs is
> > 
> >   # fstrim -v /
> >   /: 0 B (0 bytes) trimmed
> > 
> > even if there is 33G unused space ob the fs:
> > 
> >   # df -h /
> >   Filesystem      Size  Used Avail Use% Mounted on
> >   /dev/sda2        96G   61G   33G  66% /
> > 
> I think you're using an old kernel, this has been working since at least
> 4.5, but was broken in some older releases.

No, I’m always running a fairly up-to-date vanilla kernel on this
system. At the moment it’s:

  Linux hermione 4.7.2 #4 SMP PREEMPT Wed Aug 24 17:12:03 CEST 2016 x86_64 GNU/Linux

I’m running kernels ≥ 4.5.0 since about April and I first reported this
problem at 7 Jul 2016 (Subject: fstrim problem/bug) probably with a
4.6.3 kernel.

	MfG
	bmg

-- 
„Des is völlig wurscht, was heut beschlos- | M G Berberich
 sen wird: I bin sowieso dagegn!“          | mail@m-berberich.de
(SPD-Stadtrat Kurt Schindler; Regensburg)  |