NFS Mount and LARGE amounts of "INACT" memory

[Larry Rosenman]

On 2015-06-19 18:58, Rick Macklem wrote:
> Larry Rosenman wrote:
>> On 2015-06-17 07:26, Larry Rosenman wrote:
>> > I have a 64G memory FreeBSD 11-CURRENT system that has a couple of
>> > mounts to a FreeNAS (FreeBSD 9.3) system.
>> >
>> > When my rsync from a different system to one of the NFS mounts
>> > runs, I
>> > get like 48G of Inactive memory that goes back to
>> > free if I umount the share.
>> >
>> > I'm wondering why this memory moves from ZFS ARC to INACT.
>> >
>> > And, is this expected?
> A wild ass guess would be yes. Assuming you are referring to the NFS
> client (and not FreeNAS server) and guessing that rsync uses mmap'd
> I/O...
> - The pages will be associated with the file's vnode until that vnode
>   is recycled. (mmap'd I/O can continue after the file is closed.)
>   This could take a long time.
> I am not knowledgible w.r.t. the VM subsystem, but I'm guessing that
> there is some way for these pages to be reused if memory is limited?
> (Hopefully someone with VM knowledge can comment on this?)
> 
Yes, this is the NFS Client, not sure on mmap(2), but that would make 
sense

BUT, I don't like that it kills my ZFS ARC....

VM Guys?

> rick
> 
>> I've posted screenshots at:
>> 
>> http://www.lerctr.org/~ler/FreeBSD_inact/
>> 
>> 
>> --
>> Larry Rosenman                     http://www.lerctr.org/~ler
>> Phone: +1 214-642-9640                 E-Mail: ler at lerctr.org
>> US Mail: 108 Turvey Cove, Hutto, TX 78634-5688
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-- 
Larry Rosenman                     http://www.lerctr.org/~ler
Phone: +1 214-642-9640                 E-Mail: ler at lerctr.org
US Mail: 108 Turvey Cove, Hutto, TX 78634-5688