Date: Sat, 1 Oct 2011 22:27:18 -0700 From: Xin LI <delphij@gmail.com> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: freebsd-fs@freebsd.org, Adrian Chadd <adrian@freebsd.org>, delphij@freebsd.org Subject: Re: is TMPFS still highly experimental? Message-ID: <CAGMYy3sCCxOiVqeP4PVbvxnpcyoyQZoL%2Bw3nY8STYnpUNfj6JQ@mail.gmail.com> In-Reply-To: <20111002020231.GA70864@icarus.home.lan> References: <CAOfDtXMm9K_fbOmvG2gvXxDfKakkgpPt9MLifqDxa4wCibMExg@mail.gmail.com> <alpine.GSO.1.10.1110011122030.882@multics.mit.edu> <CADLo83-s_3H8PbbxOPPxbe0m10U0U5JW-feB294dFs%2BQ3iTWvg@mail.gmail.com> <CAGMYy3ssi%2BkAuufDTHA1z6u7jRrZwRRkCCkcO94GHNGF9Rku_w@mail.gmail.com> <20111002020231.GA70864@icarus.home.lan>
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On Sat, Oct 1, 2011 at 7:02 PM, Jeremy Chadwick <freebsd@jdc.parodius.com> wrote: > On Sat, Oct 01, 2011 at 06:02:39PM -0700, Xin LI wrote: >> On Sat, Oct 1, 2011 at 8:48 AM, Chris Rees <crees@freebsd.org> wrote: >> > I've also not heard of anyone using it with zfs successfully- it tends to >> > shrink rapidly. >> >> I'm quite surprised with this assertion. I use tmpfs on my own system >> and I never see such problem as long as one have sufficient swap >> space. >> >> Not to say there is no problem --there is no way to say "commit this >> amount of memory to ZFS" but really I have never hit this exact >> alleged problem... > > Its been reported multiple times by multiple people, and there has been > no official word on -fs, -stable, or zfs-devel that this specific > problem has been fixed: > > * miyamoto moesasji > - 2011/01/01 > - 8.2-PRERELEASE (thus RELENG_8) > - World/kernel build date unknown > - http://lists.freebsd.org/pipermail/freebsd-stable/2011-January/060850.html > - http://lists.freebsd.org/pipermail/freebsd-stable/2011-January/060852.html > - http://lists.freebsd.org/pipermail/freebsd-stable/2011-January/060860.html > - http://lists.freebsd.org/pipermail/freebsd-stable/2011-January/060861.html > - Statement from Ivan Voras that it's a known problem: > - http://lists.freebsd.org/pipermail/freebsd-stable/2011-January/060867.html > > * Atilla Nagy > - 2011/01/19 > - 8.2-PRERELEASE (thus RELENG_8) > - World/kernel build date of 2011/01/08 > - http://lists.freebsd.org/pipermail/freebsd-fs/2011-January/010496.html > - http://lists.freebsd.org/pipermail/freebsd-fs/2011-January/010497.html > - http://lists.freebsd.org/pipermail/freebsd-fs/2011-January/010498.html > - http://lists.freebsd.org/pipermail/freebsd-fs/2011-January/010499.html > - http://lists.freebsd.org/pipermail/freebsd-fs/2011-January/010501.html > - http://lists.freebsd.org/pipermail/freebsd-fs/2011-January/010569.html > - Ivan Voras mentions a thread he started on -CURRENT circa 2010/11/21 > about this problem: > http://www.mail-archive.com/freebsd-current@freebsd.org/msg126491.html > > * Michael Loftis > - 2009/12/08 > - FreeBSD 8.0-RELEASE (RELENG_8_0) > - World/kernel build date of 2009/11/21 > - Might be a different problem altogether, but tmpfs is explicitly > mentioned in the fix/commit text from avg@ > - http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/141305 > > Plus Chris Rees' report. So that makes 3, possibly 4 if you consider > the PR from Michael Loftis. > > Possibly it has something to do with the exact FreeBSD version they're > using. Not just version (e.g. 8.2-RELEASE vs. 8.2-STABLE), but also > kernel/world build date -- because as we've established, ZFS changes are > happening all the time and there is very little transparency when it > comes to communicating these changes to the community. > > Maybe the problem has been fixed in RELENG_8 sometime after 2011/01/08, > but we do not know. ZFS committers would need to help. Else, folks > should be reaching out to the first two people I mentioned above and > asking if they can reproduce the problem on present-day RELENG_8. The problem Ivan have asserted was not confirmed by anyone who have swap configured properly. Gleb have pointed out that it might be related to a series of integer overflow by the way (he have also fixed a lot of tmpfs issues by the way). Cheers, -- Xin LI <delphij@delphij.net> https://www.delphij.net/ FreeBSD - The Power to Serve! Live free or die
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