kern/187594: [zfs] [patch] ZFS ARC behavior problem and fix [SB QUAR: Fri Mar 21 16:01:12 2014]

[Karl Denninger]

On 3/25/2014 3:10 AM, John wrote:
>> Karl,
>>
>> I don't know why the PR system doesn't allow multiple attachments for
>> patches
>> to be sent so they can easily be downloaded.  I continue to be
>> unsuccessful
>> at getting patches out of email that don't have line wrap are tab
>> issues. So,
>> again if you could send a link or post the latest patch I would be glad
>> to let
>> it churn.
>>
>> If I need an education about the PR system, please someone help me.
> I've had to hand edit every patch due to the extra stuff added in the email
> from mime encoding and the PR system stripping all leading white space from
> the patches that show up there.
>
> That said, I've been applying the patches to 9.2. The previous patch was a
> big improvement under my workload. It's too early to tell about the latest
> patch, but its applied to 9.2 after I upgraded to the new zfs features, r263423.
>
> The machine has 24 GB of ram and prior to the patches it had vfs.zfs.arc_max
> tuned to 14 GB to keep from swapping. With the patch I've raise arc_max to
> 16 GB (I'll raise it higher after more testing), and arc management seems to
> be working well.
>
> John Theus
> TheusGroup.com
>
You can remove the arc_max tuning entirely, since the latest patch 
allows you to set the low-RAM warning level either in pages, percentage 
of RAM or both at runtime (making pre-setting the arc_max level 
unnecessary.)


-- 
-- Karl
karl at denninger.net


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