Hello Lev, Saturday, December 8, 2018, 7:58:37 PM, you wrote:
>> Can you please narrow the problem down to a specific kernel revision? > I'm still not sure it is software or hardware problem. Looks like Samsung 850 EVO doesn't like TRIMs sent by ZFS (and I've thought it is good SSD, consumer-grade, but really good one!). I've tuned down TRIMs with vfs.zfs.per_txg_dirty_frees_percent=10 vfs.zfs.free_max_blocks=1000 vfs.zfs.vdev.trim_max_active=4 And it MOSTLY solved problem: there are some freezing from time to time (and strange consumption of CPU by low-profile threads) with these settings. When I've disabled TRIM completely all freezes are gone, and low-profile threads consume tenths of percent of CPU, as it is intended. -- Best regards, Lev mailto:l...@freebsd.org _______________________________________________ freebsd-current@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
