On Wed, Feb 12, 2020 at 11:21 PM Roman Mamedov <rm@xxxxxxxxxxx> wrote: > > On Wed, 12 Feb 2020 23:08:03 -0700 > Chris Murphy <lists@xxxxxxxxxxxxxxxxx> wrote: > > > Host: kernel 5.5.3, qemu-kvm, Btrfs, backing file is raw with +C 5.6. > > Guest: kernel 5.6.0-rc1, / is Btrfs > > > > Boot and login, and immediately run these commands: > > > > [root@localhost ~]# df -h > > /dev/vda4 96G 4.4G 91G 5% / > > # fstrim -v / > > /: 91 GiB (97633062912 bytes) trimmed > > > > 1 minute later > > > > [root@localhost ~]# fstrim -v / > > /: 3.5 GiB (3747549184 bytes) trimmed > > [root@localhost ~]# Reboot the VM with 5.5.3 and I get very slightly different values but same behavior. ~]$ sudo -i [sudo] password for hack: [root@localhost ~]# fstrim -v / /: 92.2 GiB (98953457664 bytes) trimmed [root@localhost ~]# fstrim -v / /: 3.7 GiB (3950542848 bytes) trimmed [root@localhost ~]# exit 5 minutes later $ sudo fstrim -v / /: 3.4 GiB (3658797056 bytes) trimmed > For completeness, what would be returned the 3rd time you trim? I'm not seeing a pattern. Sometimes it's the same. Sometimes it's a little different like above. -- Chris Murphy
