Date: Fri, 19 Jun 2015 19:30:52 -0500 From: Larry Rosenman <ler@lerctr.org> To: Rick Macklem <rmacklem@uoguelph.ca> Cc: Freebsd fs <freebsd-fs@freebsd.org>, rmacklem@freebsd.org Subject: Re: NFS Mount and LARGE amounts of "INACT" memory Message-ID: <7f8b3449973cff790d996bb1f169b8e0@thebighonker.lerctr.org> In-Reply-To: <bc8c541ebdc25e23b63f34d81c9cc2fc@thebighonker.lerctr.org> References: <228350188.61172889.1434758295576.JavaMail.root@uoguelph.ca> <bc8c541ebdc25e23b63f34d81c9cc2fc@thebighonker.lerctr.org>
next in thread | previous in thread | raw e-mail | index | archive | help
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.... >> 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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?7f8b3449973cff790d996bb1f169b8e0>