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Date:      Tue, 11 Aug 2015 12:59:38 +0300
From:      Alexander Motin <mav@FreeBSD.org>
To:        Dmitry Morozovsky <marck@rinet.ru>
Cc:        src-committers@freebsd.org, svn-src-all@freebsd.org,  svn-src-head@freebsd.org
Subject:   Re: svn commit: r286570 - in head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs: . sys
Message-ID:  <55C9C78A.2070707@FreeBSD.org>
In-Reply-To: <alpine.BSF.2.00.1508111237430.9571@woozle.rinet.ru>
References:  <201508101034.t7AAYOtk074606@repo.freebsd.org> <alpine.BSF.2.00.1508111237430.9571@woozle.rinet.ru>

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On 11.08.2015 12:38, Dmitry Morozovsky wrote:
> Alexander,
> 
> On Mon, 10 Aug 2015, Alexander Motin wrote:
> 
>> Author: mav
>> Date: Mon Aug 10 10:34:23 2015
>> New Revision: 286570
>> URL: https://svnweb.freebsd.org/changeset/base/286570
>>
>> Log:
>>   MFV r277426: 5408 managing ZFS cache devices requires lots of RAM
>>   
>>   illumos/illumos-gate@89c86e32293a30cdd7af530c38b2073fee01411c
> 
> [snip]
> 
>>   For an average blocksize of 8KB, this means that for the L2ARC, the ratio
>>   of metadata to data has gone down from about 2.92% to 1.56%.  For a
>>   'storage optimized' EC2 instance with 1600GB of SSD and 60GB of RAM, this
>>   means that we expect a completely full L2ARC to use (1600 GB * 0.0156) /
>>   60GB = 41% of the available memory, down from 78%.
> 
> Thanks!
> 
> Any MFC planned please?

Theoretically planned, but no specific terms yet -- too many changes.

-- 
Alexander Motin



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