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Date:      Tue, 16 Sep 2014 11:50:40 -0500
From:      Karl Denninger <karl@denninger.net>
To:        freebsd-fs@freebsd.org
Subject:   Re: Candidate ZFS ARC patch does not cleaning apply to HEAD r271671
Message-ID:  <54186A60.7050209@denninger.net>
In-Reply-To: <F254E42E6D034BEBA626DCF31454B039@multiplay.co.uk>
References:  <ec98a130ccc07847775d9f435053146b@mail.mikej.com> <F254E42E6D034BEBA626DCF31454B039@multiplay.co.uk>

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In addition the candidate "head" patch does not include resizing of the=20
dirty write buffers to prevent slamming the system's VM into paging.  It =

does fix a number of other problems.

There is a candidate against STABLE that incorporates Steve's patch and=20
those further changes; the entire thread (long!) discussing it is here:=20
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D187594

Adding the write-buffer resizing against head would be very easy; there=20
is open debate on whether it's the right thing to do or not but doing so =

has a materially-positive impact on performance for my systems.

On 9/16/2014 8:31 AM, Steven Hartland wrote:
> That patch is against stable/10 not head
>
> The additional changes it adds aren't ideal, the latest version which
> should be used at this time against head is:
> ARC reclaim refactor (against head)=20
> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D147070
>
> Additional discussions on this can be found on the illumos list subject=
:
> ZFS Write Throttle Dirty Data Limit Interation with Free Memory
>
> ----- Original Message ----- From: "Michael Jung" <mikej@mikej.com>
> To: <freebsd-fs@freebsd.org>
> Sent: Tuesday, September 16, 2014 2:11 PM
> Subject: Candidate ZFS ARC patch does not cleaning apply to HEAD r27167=
1
>
>
>> Note: no problems patching/compiling/running against 10-stable=20
>> r271671+other revs
>>
>> Original patch source:
>>
>> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D147286&action=3D=
edit
>>
>> Downloaded patch applied:
>>
>> http://216.26.158.189/zfs-candidate/zfs-candidate.patch
>>
>> Errors:
>>
>> http://216.26.158.189/zfs-candidate/patch.error
>> http://216.26.158.189/zfs-candidate/arc.c.rej
>> http://216.26.158.189/zfs-candidate/kmem.h.rej
>> http://216.26.158.189/zfs-candidate/vm_pageout.c.rej
>>
>> Regards,
>>
>> Michael Jung
>>
>>
>>
>>
>>
>> _______________________________________________
>> freebsd-fs@freebsd.org mailing list
>> http://lists.freebsd.org/mailman/listinfo/freebsd-fs
>> To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org"
>>
> _______________________________________________
> freebsd-fs@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-fs
> To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org"
>
>
> %SPAMBLOCK-SYS: Matched [@freebsd.org+], message ok

--=20
Karl Denninger
karl@denninger.net <mailto:karl@denninger.net>
/The Market Ticker/

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