Setting sysctl vfs.zfs.arc_max failed: 22

[Allan Jude]

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 @ 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

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