On Thu, Dec 14, 2017 at 05:52:15AM +1100, Peter Jeremy wrote: > On 2017-Dec-06 10:01:02 +0000, Baptiste Daroussin <[email protected]> wrote: > >Author: bapt > >Date: Wed Dec 6 10:01:02 2017 > >New Revision: 326619 > >URL: https://svnweb.freebsd.org/changeset/base/326619 > > > >Log: > > MFC r325851: > > > > remove the poor emulation of the IllumOS needfree global variable to > > prevent > > the ARC reclaim thread running longer than needed. > > > > This change appears to break the backpressure mechanism that forces > ARC to release wired memory. Running FreeBSD/amd64 r326743, I found > that my system was thrashing badly with almost all memory (~31GB out > of 32GB) wired (including 19GB ARC, 7GB VBox guests). Running a tool > that just allocates and dirties a large amount of memory had no effect > on the ARC size. Reverting this change only restores normal behaviour > where ARC will shrink under pressure. > > My ZFS boot tunables are: > vfs.zfs.arc_max="24G" > vfs.zfs.arc_meta_limit="12G" >
You are running an issue on head? or on stable/11? Given you are reporting the issue on the MFC commit Best regards, Bapt
signature.asc
Description: PGP signature
