On Tue, Sep 22, 2020 at 12:33:19PM -0400, Mark Johnston wrote: ! On Tue, Sep 22, 2020 at 06:08:01PM +0200, Peter wrote:
! > my machine should use about 3-4, maybe 5 GB swapspace. Today I found ! > it suddenly uses 8 GB (which is worryingly near the configured 10G). ! > ! > I stopped all the big suckers - nothing found. ! > I stopped all the jails - no success. ! > I brought it down to singleuser: it tried to swapoff, but failed. ! > ! > I unmounted all filesystems, exported all pools, detached all geli, ! > and removed most of the netgraphs. Swap is still occupied. ! > ! > Machine is now running only the init and a shell processes, has ! > almost no filesystems mounted, has mostly native networks only, and ! > this still occupies 3 GB of swap which cannot be released. ! > ! > What is going on, what is doing this, and how can I get this swapspace ! > released?? ! ! Do you have any shared memory segments lingering? ipcs -a will show ! SysV shared memory usage. I have four small shmem segments from four postgres clusters running. These should cleanly disappear when the clusters are stopped, and they are very small. Shared Memory: T ID KEY MODE OWNER GROUP CREATOR CGROUP NATTCH SEGSZ CPID LPID ATIME DTIME CTIME m 65536 5432001 --rw------- postgres postgres postgres postgres 7 48 4793 4793 6:09:34 18:00:31 6:09:34 m 65537 0 --rw------- postgres postgres postgres postgres 11 48 6268 6268 6:09:42 10:48:27 6:09:42 m 65538 0 --rw------- postgres postgres postgres postgres 5 48 6968 6968 6:09:46 18:28:36 6:09:46 m 65539 0 --rw------- postgres postgres postgres postgres 6 48 6992 6992 6:09:47 3:38:34 6:09:47 ! For POSIX shared memory, in 11.4 we do not ! have any good way of listing objects, but "vmstat -m | grep shmfd" will ! at least show whether any are allocated. There is something, and I don't know who owns that: $ vmstat -m | grep shmfd shmfd 13 14K - 473 64,256,1024,8192 But that doesn't look big either. Furthermore, this machine is running for quite some time already; it was running as i386 (with ZFS) until very recently, and I know quite well what is using much memory: these 3 GB were illegitimate; they came from nothing I did install. And they are new; this has not happened before. ! If those don't turn anything ! up then it's possible that there's a swap leak. Do you use any DRM ! graphics drivers on this system? Probably yes. There is no graphics used at all; it just uses "device vt" in text mode, but it uses i5-3570T CPU (IvyBridge HD2500) graphics for that, and the driver is "drm2" and "i915drm" from /usr/src/sys (not those from ports). Not sure how that would account for 3 GB, unless there is indeed some leak. regards, PMc _______________________________________________ email@example.com mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"