[Bug 201332] large quantity of INACT memory after rsync to NFS mount

Sat Jul 4 15:54:21 UTC 2015

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201332

            Bug ID: 201332
           Summary: large quantity of INACT memory after rsync to NFS
                    mount
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ler at lerctr.org

I have an NFS mount to a FreeNAS system, and it's used to rsync backup a remote
server. 

When the rsync is finished we have a ton (49G) of inact memory:
last pid: 67711;  load averages:  6.90,  5.89,  5.85    up 3+16:00:34  10:50:16
76 processes:  9 running, 67 sleeping
CPU:  0.0% user, 48.0% nice,  0.1% system,  0.0% interrupt, 51.9% idle
Mem: 300M Active, 49G Inact, 12G Wired, 1655M Buf, 748M Free
ARC: 5793M Total, 2663M MFU, 644M MRU, 1168K Anon, 131M Header, 2354M Other
Swap: 96G Total, 194M Used, 96G Free

when I umount the share, it all goes to Free:
borg.lerctr.org /home/ler $ sudo umount /vault/backup/TBH
Password:
last pid: 67724;  load averages:  6.57,  6.09,  5.93    up 3+16:03:23  10:53:05
76 processes:  9 running, 67 sleeping
CPU:     % user,     % nice,     % system,     % interrupt,     % idle
Mem: 300M Active, 173M Inact, 10G Wired, 1655M Buf, 50G Free
ARC: 5794M Total, 2663M MFU, 645M MRU, 1424K Anon, 131M Header, 2354M Other
Swap: 96G Total, 194M Used, 96G Free

1) is this expected?
2) if not, how can we prevent/fix it?

borg.lerctr.org /home/ler $ uname -aKU
FreeBSD borg.lerctr.org 11.0-CURRENT FreeBSD 11.0-CURRENT #4 r284983: Tue Jun
30 18:01:26 CDT 2015     root at borg.lerctr.org:/usr/obj/usr/src/sys/VT-LER 
amd64 1100077 1100077
borg.lerctr.org /home/ler $
/etc/fstab:
freenas.lerctr.org:/mnt/data/TBH    /vault/backup/TBH    nfs     rw 0 0

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