Date: Mon, 22 Jun 2015 09:40:29 -0500 From: Larry Rosenman <ler@lerctr.org> To: Rick Macklem <rmacklem@uoguelph.ca> Cc: Freebsd fs <freebsd-fs@freebsd.org>, rmacklem@freebsd.org, Freebsd current <freebsd-current@freebsd.org> Subject: Re: NFS Mount and LARGE amounts of "INACT" memory Message-ID: <06abcbf4fab73f3c0ba711269934e0ea@thebighonker.lerctr.org> In-Reply-To: <7f8b3449973cff790d996bb1f169b8e0@thebighonker.lerctr.org> References: <228350188.61172889.1434758295576.JavaMail.root@uoguelph.ca> <bc8c541ebdc25e23b63f34d81c9cc2fc@thebighonker.lerctr.org> <7f8b3449973cff790d996bb1f169b8e0@thebighonker.lerctr.org>
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On 2015-06-19 19:30, Larry Rosenman wrote: > On 2015-06-19 19:00, Larry Rosenman wrote: >> 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? >> > BTW, a quick grep if the rsync sources shows it does NOT use mmap, but > has some mmap-like routines, > so I'm at a loss.... Adding in -CURRENT for the 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@lerctr.org >>>> US Mail: 108 Turvey Cove, Hutto, TX 78634-5688 >>>> _______________________________________________ >>>> 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" >>>> -- Larry Rosenman http://www.lerctr.org/~ler Phone: +1 214-642-9640 E-Mail: ler@lerctr.org US Mail: 108 Turvey Cove, Hutto, TX 78634-5688
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