Date: Fri, 19 Jun 2015 19:00:56 -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: <bc8c541ebdc25e23b63f34d81c9cc2fc@thebighonker.lerctr.org> In-Reply-To: <228350188.61172889.1434758295576.JavaMail.root@uoguelph.ca> References: <228350188.61172889.1434758295576.JavaMail.root@uoguelph.ca>
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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@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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