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Subject: Re: Disk/ZFS activity crash on 11.2-STABLE [SOLVED]
To: "Kevin P. Neal" <kpn@neutralgood.org>
Cc: freebsd-questions@freebsd.org
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From: Shane Ambler <FreeBSD@ShaneWare.Biz>
Message-ID: <2028aa72-03ae-620a-cf50-cdfdd936829f@ShaneWare.Biz>
Date: Mon, 16 Jul 2018 13:05:08 +0930
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On 16/07/2018 01:21, Kevin P. Neal wrote:
> On Sat, Jul 14, 2018 at 03:11:21PM +0930, Shane Ambler wrote:
>> To add my 2c -
>>
>> I recently realised that the arc_max defaults allow all ram to be
>> allocated as wired, which is bad.
>>
>> arc_max should not be set higher than physical ram - max_wired - buffer
>>
>> It is time I put this into a bug report -
>> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229764
> 
> Does this affect 11.2-RELEASE? Is it new?
> 
> I've got a machine with 8GB memory that I need to not fall over after an
> upgrade from 11.1-RELEASE.
> 

It is no different between any recent system releases. You shouldn't see
any difference between 11.1 and 11.2 in this matter.

If you are willing to buildworld, I would suggest looking at
https://reviews.freebsd.org/D7538
For me, I see much better memory use and less swapping, improvements
from this should prevent wired amounts being an issue.

-- 
FreeBSD - the place to B...Software Developing

Shane Ambler