Date: Sat, 23 May 2020 23:41:08 +0200 From: Miroslav Lachman <000.fbsd@quip.cz> To: Walter Cramer <wfc@mintsol.com> Cc: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: ZFS on FreeBSD 11.3 slower than 10.4 Message-ID: <dab15bea-f882-efab-7f26-6ead2948efdc@quip.cz> In-Reply-To: <20200523155301.U91902@mulder.mintsol.com> References: <1ff455a5-d111-86fa-ceb1-1021b6d9a5b6@quip.cz> <20200523155301.U91902@mulder.mintsol.com>
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On 2020-05-23 22:11, Walter Cramer wrote: > 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 > > 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. Free memory is not a problem. The machine in question has vfs.zfs.arc_max="1024M" (the same as in 10.4) Kind regards Miroslav Lachman
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