Date: Wed, 12 May 2021 09:06:02 -0700 From: Pete Wright <pete@nomadlogic.org> To: Andriy Gapon <avg@FreeBSD.org>, freebsd-fs@freebsd.org Subject: Re: Changes in vfs.zfs.arc_max on 13 Message-ID: <95d2d77f-c995-69ce-c6d6-ea8e22e9515b@nomadlogic.org> In-Reply-To: <dcf63f50-5ea6-8524-37b3-577bda3ba06f@FreeBSD.org> References: <0961dfe0-922e-8a6f-0bf9-c0685e3ec3d1@nomadlogic.org> <dcf63f50-5ea6-8524-37b3-577bda3ba06f@FreeBSD.org>
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On 5/11/21 11:40 PM, Andriy Gapon wrote: > On 11/05/2021 20:09, Pete Wright via freebsd-fs wrote: >> The next issue I am seeing is that when setting this variable the >> example from the handbook states you can do something similar to this >> (section 20.6.2.3): >> >> vfs.zfs.arc_max="40M" >> >> This throws an error on my system: >> $ sudo sysctl vfs.zfs.arc_max=2048M >> sysctl: invalid unsigned long '2048M' >> $ sudo sysctl vfs.zfs.arc_max=2G >> sysctl: invalid unsigned long '2G' >> >> Using the human unfriendly form works though: >> $ sudo sysctl vfs.zfs.arc.max="2000000000" >> vfs.zfs.arc.max: 0 -> 2000000000 >> $ >> >> Is this a bug, or would it be best to also update the documentation >> accordingly to reflect this? Personally I like the old behavior as >> it's easier on my eyes. > > Are you sure that that is a recipe for sysctl? > It looks like it was for loader.conf. > Ah interesting, the examples certainly refer to loader.conf knobs. I had mistakenly assumed that the sysctl values would take the same form. Section 20.6.1 of the handbook isn't clear on this distinction: "This value can be adjusted at runtime with sysctl(8) <https://www.freebsd.org/cgi/man.cgi?query=sysctl&sektion=8&format=html>; and can be set in /boot/loader.conf or /etc/sysctl.conf." zfs-module-parameters(5) is a bit more clear on this it looks like. Is it common for loader variables to accept different formatted values for the same knob? -pete -- Pete Wright pete@nomadlogic.org @nomadlogicLA
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