Date: Tue, 24 Aug 2010 23:11:37 +0200 From: Marco van Tol <marco@tols.org> To: freebsd-fs@freebsd.org Subject: Re: zfs arc - just take it all and be good to me Message-ID: <20100824211136.GA18104@tolstoy.tols.org> In-Reply-To: <20100824200527.GC11990@server.vk2pj.dyndns.org> References: <20100810214418.GA28288@tolstoy.tols.org> <20100811014919.GA52992@icarus.home.lan> <20100811192537.GA44635@tolstoy.tols.org> <AANLkTin-YvEzoN-ThwwDAqn2mWFMD4-7BnP8N95EqTk0@mail.gmail.com> <20100811214302.GB44635@tolstoy.tols.org> <20100812205625.GA79515@server.vk2pj.dyndns.org> <20100824150035.GB99477@roberto-al.eurocontrol.fr> <20100824200527.GC11990@server.vk2pj.dyndns.org>
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[-- Attachment #1 --] On Wed, Aug 25, 2010 at 06:05:27AM +1000, Peter Jeremy wrote: > On 2010-Aug-24 17:00:36 +0200, Ollivier Robert <roberto@keltia.freenix.fr> wrote: > >According to Peter Jeremy: > >> I suspect Artem is referring to his patch at http://pastebin.com/ZCkzkWcs > >> which I have tweaked somewhat (see the last patch in > >> http://www.freebsd.org/cgi/query-pr.cgi?pr=146410 ). > > > >Thanks, cou you please send it in a non-QP-encoded form please? > > See attached. > > >> Whilst these patches _are_ hacks, they seem to do a good job of > >> making ZFS and UFS play together. > > > >Is the patch only useful in these mixed situations or could it be also interestng for those of use running full-zfs (cf. http://www.keltia.net/howtos/zfsboot)? > > I think it will be useful. As well as the trivial fix to count > "cache" as "free" space (which is now in -stable), the intent of the > patch is to improve the ability of ZFS to apply pressure to the VM > subsystem. In theory, this should improve overall system performance > even in a ZFS-only environment where there is memory pressure due to > large, long-running processes Would the inactive pages of the long running processes be swapped out in favour of the arc? That would be great I think as long as that is made clear at an obvious place so people don't get worried about swap usage on a system that "shouldn't need to swap out anything". /usr/src/UPDATING springs to mind, together with quick hints on how to see that the swapped out pages are harmless. :) Marco van Tol P.S. Forgive me if what I say is bs, within what I know it makes sense. :) -- A male gynecologist is like an auto mechanic who never owned a car. - Carrie Snow [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (FreeBSD) iEYEARECAAYFAkx0NYcACgkQbdVEUcCKvoLYHACgvutHMn7h5i/Z0w4yRTlvPA6a Gj0An2f/1OkN8d9adcxHN95rB5b50tUR =NyDj -----END PGP SIGNATURE-----
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