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Date: Wed, 03 Sep 2014 16:22:58 -0400
From: Nikolai Lifanov <lifanov@mail.lifanov.com>
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To: John Baldwin <jhb@freebsd.org>
Subject: Re: svn commit: r270759 - in head/sys: cddl/compat/opensolaris/kern
 cddl/compat/opensolaris/sys cddl/contrib/opensolaris/uts/common/fs/zfs vm
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Cc: src-committers@freebsd.org, Peter Wemm <peter@wemm.org>,
 Alan Cox <alc@rice.edu>, svn-src-all@freebsd.org,
 Dmitry Morozovsky <marck@rinet.ru>,
 "Matthew D. Fuller" <fullermd@over-yonder.net>,
 Steven Hartland <killing@multiplay.co.uk>, svn-src-head@freebsd.org
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On 09/03/14 15:22, John Baldwin wrote:
> On Wednesday, September 03, 2014 11:05:04 AM Nikolai Lifanov wrote:
>> On 09/03/14 04:09, Steven Hartland wrote:
>>> I'm looking to MFC this change so wanted to check if
>>> anyone had an final feedback / objections?
>>>
>>> I know we currently have Alan's feedback on changing
>>> the #ifdef __i386__ to #ifndef UMA_MD_SMALL_ALLOC
>>> which sounds sensible but waiting Peter to comment on.
>>>
>>>    Regards
>>>    Steve
>>
>> I have no technical input, but this change improves ARC usefulness for
>> me quite a bit. I would like to see the improvement in 10-STABLE.
> 
> Can you verify that the current 10-STABLE (as of today) with all the various 
> pagedaemon fixes still has ARC issues for your workload?
> 

It doesn't have any issues, but I noticed the improvement on CURRENT. I
observed that just after this change, my package builder is much more
likely to retain MFU and not evict useful things from there (the port
tree) after large builds.
However, I run a lot more 10.0-RELEASE than CURRENT and I would like to
see this improvement release-bound.

I would be happy to test this on 10-STABLE if you think that this is
relevant.

- Nikolai Lifanov