Re: Setting sysctl vfs.zfs.arc_max failed: 22

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> 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>> 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 _at_ 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
> >>
> >>
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> >
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>
> 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
>
>