On Tue, Apr 10, 2018 at 01:56:06PM +0000, Mark Johnston wrote:
> Author: markj
> Date: Tue Apr 10 13:56:06 2018
> New Revision: 332365
> URL: https://svnweb.freebsd.org/changeset/base/332365
>
> Log:
> Set zfs_arc_free_target to v_free_target.
>
> Page daemon output is now regulated by a PID controller with a setpoint
> of v_free_target. Moreover, the page daemon now wakes up regularly
> rather than waiting for a wakeup from another thread. This means that
> the free page count is unlikely to drop below the old
> zfs_arc_free_target value, and as a result the ARC was not readily
> freeing pages under memory pressure. Address the immediate problem by
> updating zfs_arc_free_target to match the page daemon's new behaviour.
Can you explain some more about new page daemon algo (and reclaim zone
free memory)?
PS: zfs need some more time for free pages from ARC. Also, vanila zfs
have broken logic for count used and free ARC's memory. For most
correctly count system-wide used and free memory need accounting
in-zone free memory.
> arc_free_target_init(void *unused __unused)
> {
>
> - zfs_arc_free_target = (vm_cnt.v_free_min / 10) * 11;
> + zfs_arc_free_target = vm_cnt.v_free_target;
> }
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