FreeBSD 10.1 Memory Exhaustion

[Willem Jan Withagen]

On 15/07/2015 21:43, Mark Felder wrote:
> 
> 
> On Tue, Jul 14, 2015, at 10:10, Sean Chittenden wrote:
>> I think the reason this is not seen more often is because people
>> frequently
>> throw limits on the arc in /boot/loader.conf:
>>
>> vfs.zfs.arc_min="18G"
>> vfs.zfs.arc_max="149G"
>>
>> ZFS ARC *should* not require those settings, but does currently for mixed
>> workloads (i.e. databases) in order to be "stable".  By setting fixed
>> sizes
>> on the ARC, UMA and ARC are much more cooperative in that they have their
>> own memory regions to manage so this behavior is not seen as often.
>>
>> To be clear, however, it should not be necessary to set parameters like
>> these in /boot/loader.conf in order to obtain consistent operational
>> behavior.  I'd be curious to know if someone running 10.2 BETA without
>> patches is able to trigger this behavior or not.  There was work done
>> that
>> reported helped with this between 10.1 and now.  To what extent it
>> helped,
>> however, I don't have any advice yet.
>>
> 
> I was about to email "I have 12TB at home and 4GB of RAM with a very
> erratic workload and never run into any issues" and then I looked at
> /boot/loader.conf and saw vfs.zfs.arc_max="2G"
> 
> Now I'm too scared to turn it off... :-)

Same here.
Just a leftover of all the advise to limit arc in the past.
Just bit the bullit: installed BETA1, killed the settings and rebooted.
We'll see what comes of it.

--WjW