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Date:      Mon, 16 Jul 2018 13:05:08 +0930
From:      Shane Ambler <FreeBSD@ShaneWare.Biz>
To:        "Kevin P. Neal" <kpn@neutralgood.org>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: Disk/ZFS activity crash on 11.2-STABLE [SOLVED]
Message-ID:  <2028aa72-03ae-620a-cf50-cdfdd936829f@ShaneWare.Biz>
In-Reply-To: <20180715155115.GA16043@neutralgood.org>
References:  <20180711212959.GA81029@g5.umpquanet.com> <5ebd8573-1363-06c7-cbb2-8298b0894319@sentex.net> <20180712183512.GA75020@g5.umpquanet.com> <a069a076-df1c-80b2-1116-787e0a948ed9@sentex.net> <20180712214248.GA98578@g5.umpquanet.com> <20180713191050.GA98371@g5.umpquanet.com> <ebcb9d30-59be-bcb8-ecaf-cce316d999eb@sentex.net> <4d4726a7-66e0-4f7e-f230-b68e440ad8f6@ShaneWare.Biz> <20180715155115.GA16043@neutralgood.org>

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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




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