On 2017-Dec-19 15:15:38 +0100, Baptiste Daroussin <[email protected]> wrote: >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
I'm running into the problem on stable/11. Sorry for not making that clear. -- Peter Jeremy
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