Setting sysctl vfs.zfs.arc_max failed: 22
Nathan Bosley
nathan.bosley at gmail.com
Wed Jul 6 02:16:45 UTC 2016
OK, I follow you now.
Thanks for the explanation.
I will try that later tonight or tomorrow.
On Tue, Jul 5, 2016 at 9:45 PM, Allan Jude <allanjude at freebsd.org> wrote:
> On 2016-07-05 21:32, Nathan Bosley wrote:
> > I think in about 4 - 5 hours I can show what values I'm using in
> > loader.conf under, say, r302264 and r302265 for comparison. I'm not 100%
> > sure that the problem arose for me in r302265; I merely suspect it.
> >
> > On Tue, Jul 5, 2016 at 9:25 PM, Allan Jude <allanjude at freebsd.org
> > <mailto:allanjude at freebsd.org>> wrote:
> >
> > On 2016-07-05 20:27, Steven Hartland wrote:
> > > Ahh right, let me check that.
> > >
> > > On 06/07/2016 00:51, Nathan Bosley wrote:
> > >> I actually have this same problem.
> > >> I'll send more details when I get home later.
> > >>
> > >> I think the problem started for me after r302265.
> > >> Before that, I can set vfs.zfs.arc_max and vfs.zfs.arc_min in
> > >> loader.conf.
> > >> After r302265, setting either vfs.zfs.arc_max or vfs.zfs.arc_min
> in
> > >> loader.conf results in the EINVAL errors in 'dmesg':
> > >>
> > >> Setting sysctl vfs.zfs.arc_max failed: 22
> > >> Setting sysctl vfs.zfs.arc_min failed: 22
> > >>
> > >> But setting vfs.zfs.arc_meta_limit in loader.conf works fine.
> > >>
> > >> But I did notice that using 'sysct' or sysctl.conf for
> vfs.zfs.arc_max
> > >> and vfs.zfs.arc_min works.
> > >> I only have problems with setting them now in loader.conf.
> > >>
> > >> Like I said, I'll try to send output from my setup later.
> > >>
> > >> Thanks.
> > >>
> > >> On Tue, Jul 5, 2016 at 6:10 PM, Steven Hartland
> > >> <steven at multiplay.co.uk <mailto:steven at multiplay.co.uk>
> > <mailto:steven at multiplay.co.uk <mailto:steven at multiplay.co.uk>>>
> wrote:
> > >>
> > >> What is it currently?
> > >>
> > >> Just had a quick play here:
> > >> sysctl vfs.zfs.arc_max
> > >> vfs.zfs.arc_max: 32283127808
> > >> sysctl vfs.zfs.arc_max=32283127807
> > >> vfs.zfs.arc_max: 32283127808 -> 32283127807
> > >> sysctl vfs.zfs.arc_max=32283127808
> > >> vfs.zfs.arc_max: 32283127807 -> 32283127808
> > >>
> > >> Error 22 = EINVAL so I suspect you're requesting a value
> > which one
> > >> of the following:
> > >> * < arc_abs_min
> > >> * > kmem_size
> > >> * < arc_c_min
> > >> * < zfs_arc_meta_limit
> > >>
> > >> Regards
> > >> Steve
> > >>
> > >> On 05/07/2016 22:56, Eric van Gyzen wrote:
> > >>
> > >> Steven and -current:
> > >>
> > >> I just updated to r302350 with a GENERIC kernel config.
> > I see
> > >> this in
> > >> dmesg:
> > >>
> > >> VT(efifb): resolution 1024x768
> > >> Setting sysctl vfs.zfs.arc_max failed: 22
> > >> CPU: Intel(R) Xeon(R) CPU E5-1650 v3 @ 3.50GHz
> > >> (3491.98-MHz K8-class
> > >> CPU)
> > >>
> > >> The relevant parts of /boot/loader.conf are:
> > >>
> > >> zfs_load="YES"
> > >> vfs.zfs.arc_max="6442450944"
> > >>
> > >> Let me know what other information you need.
> > >>
> > >> Cheers,
> > >>
> > >> Eric
> > >>
> > >>
> > >> _______________________________________________
> > >> freebsd-current at freebsd.org
> > <mailto:freebsd-current at freebsd.org>
> > <mailto:freebsd-current at freebsd.org
> > <mailto:freebsd-current at freebsd.org>>
> > >> mailing list
> > >> https://lists.freebsd.org/mailman/listinfo/freebsd-current
> > >> To unsubscribe, send any mail to
> > >> "freebsd-current-unsubscribe at freebsd.org
> > <mailto:freebsd-current-unsubscribe at freebsd.org>
> > >> <mailto:freebsd-current-unsubscribe at freebsd.org
> > <mailto:freebsd-current-unsubscribe at freebsd.org>>"
> > >>
> > >>
> > >
> > > _______________________________________________
> > > freebsd-current at freebsd.org <mailto:freebsd-current at freebsd.org>
> > mailing list
> > > https://lists.freebsd.org/mailman/listinfo/freebsd-current
> > > To unsubscribe, send any mail to "
> freebsd-current-unsubscribe at freebsd.org
> > <mailto:freebsd-current-unsubscribe at freebsd.org>"
> >
> >
> > I think the issue might be that the default value of arc_min is
> higher
> > than when the user is trying to set arc_max to. In that case we might
> > want sysctl to lower arc_min instead of giving an error?
> >
> > It would definitely be a POLA violation to have to set arc_min lower
> to
> > be able to have existing lines that set arc_max in loader.conf work
> > correctly.
> >
> > --
> > Allan Jude
> >
> >
>
> The problem is related to Steven's commit, which makes it so you can
> adjust arc_max and arc_min at runtime. Part of this change put in a
> requirement that the new arc_max you are trying to set, must be less
> than the current arc_min. When you first boot, i think the default is
> arc_max = all ram save 1GB, and arc_min = 1/8 of that.
>
> So if you try to set your arc_max to 1/8th or less, it will fail with
> that error 22 (this should be fixed).
>
> You can work around it temporarily by setting a lower arc_min first.
>
>
> --
> Allan Jude
>
>
More information about the freebsd-current
mailing list