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:lev_at_FreeBSD.orgReceived on Sat Dec 08 2018 - 18:09:47 UTC
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