Candidate ZFS ARC patch does not cleaning apply to HEAD r271671

[Karl Denninger]

In addition the candidate "head" patch does not include resizing of the 
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 
those further changes; the entire thread (long!) discussing it is here: 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=187594

Adding the write-buffer resizing against head would be very easy; there 
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) 
> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=147070
>
> 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 at mikej.com>
> To: <freebsd-fs at freebsd.org>
> Sent: Tuesday, September 16, 2014 2:11 PM
> Subject: Candidate ZFS ARC patch does not cleaning apply to HEAD r271671
>
>
>> Note: no problems patching/compiling/running against 10-stable 
>> r271671+other revs
>>
>> Original patch source:
>>
>> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=147286&action=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
>>
>>
>>
>>
>>
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-- 
Karl Denninger
karl at denninger.net <mailto:karl at denninger.net>
/The Market Ticker/
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