Setting sysctl vfs.zfs.arc_max failed: 22
Nathan Bosley
nathan.bosley at gmail.com
Wed Jul 6 06:20:59 UTC 2016
Maybe I misunderstood after all.
I took this:
"You can work around it temporarily by setting a lower arc_min first."
To mean that I could do something like:
vfs.zfs.arc_min="1073741824"
vfs.zfs.arc_max="8589934592"
in loader.conf, which would circumvent the problem.
But with the above, in that order, I still get:
Setting sysctl vfs.zfs.arc_max failed: 22
Setting sysctl vfs.zfs.arc_min failed: 22
As an FYI, WITHOUT any tunables set, my defaults are:
vfs.zfs.arc_meta_limit: 3903459328
vfs.zfs.arc_min: 1951729664
vfs.zfs.arc_max: 15613837312
So even if I only specified:
vfs.zfs.arc_max="8589934592"
in loader.conf, that's still not below my default min.
However, if I make the changes with 'sysctl' after boot, it works fine:
root at athlonbsd:~ # sysctl vfs.zfs.arc_min="1073741824"
vfs.zfs.arc_min: 1951729664 -> 1073741824
root at athlonbsd:~ # sysctl vfs.zfs.arc_max="8589934592"
vfs.zfs.arc_max: 15613837312 -> 8589934592
They also work fine sysctl.conf.
Sorry if this is a silly question:
I should still be able to set these max/min values in loader.conf,
right--not just in sysctl.conf?
Thanks.
On Tue, Jul 5, 2016 at 10:16 PM, Nathan Bosley <nathan.bosley at gmail.com>
wrote:
> 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>>
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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
>> >
>> >
>>
>> 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
>>
>>
>
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