Date: Sat, 23 May 2020 16:11:38 -0400 (EDT) From: Walter Cramer <wfc@mintsol.com> To: Miroslav Lachman <000.fbsd@quip.cz> Cc: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: ZFS on FreeBSD 11.3 slower than 10.4 Message-ID: <20200523155301.U91902@mulder.mintsol.com> In-Reply-To: <1ff455a5-d111-86fa-ceb1-1021b6d9a5b6@quip.cz> References: <1ff455a5-d111-86fa-ceb1-1021b6d9a5b6@quip.cz>
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On Sat, 23 May 2020, Miroslav Lachman wrote: > I upgraded my old desktop computer few month ago from old 10.4 based PC-BSD > to stock FreeBSD 11.3. It uses single 2TB HDD 7200rpm. > My problem is that upgraded version is really slow and some desktop > applications are very lagging (playing multimedia is interrupted for a > fraction of seconds) when there is heavy filesystem activity. > > I am using zfsnap2 for taking snapshots periodically and when there is enough > snapshots zfs destroy is called. In this time the user experience is > terrible. Starting new application like browser or even something much > smaller takes minutes. The old version based on FreeBSD 10.4 behaves much > better. I used the old version for years and never have problems with > interrupted multimedia playback. > > Are there some sysctls to tune to get better desktop interactivity in heavy > filesystem operations like zfs destroy, pkg check or other "find" periodic > scripts? > > Kind regards > Miroslav Lachman > _______________________________________________ > freebsd-fs@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" Does `top` or `vmstat` show that Free Memory is quite low when you are experiencing the problem? We had ARC / Free Memory performance problems with 11.X, and found that setting the sysctl "vfs.zfs.arc_max" much lower was necessary.
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