Date: Sun, 4 Jun 2006 13:49:59 -0400 From: Kris Kennaway <kris@obsecurity.org> To: Giorgos Keramidas <keramida@ceid.upatras.gr> Cc: Craig Boston <craig@xfoil.gank.org>, freebsd-current@freebsd.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: md /tmp and async mounts Message-ID: <20060604174958.GA34224@xor.obsecurity.org> In-Reply-To: <20060604050316.GE61942@gothmog.pc> References: <20060523194106.GA46634@xor.obsecurity.org> <20060524203645.GB13500@gothmog.pc> <20060524203747.GA88742@xor.obsecurity.org> <20060524204617.GA13701@gothmog.pc> <20060601002024.GA1453@gothmog.pc> <20060601210655.GA36389@xor.obsecurity.org> <20060601213527.GA53422@gothmog.pc> <20060602215005.GA43170@nowhere> <20060602220724.GA71883@xor.obsecurity.org> <20060604050316.GE61942@gothmog.pc>
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--AhhlLboLdkugWU4S Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, Jun 04, 2006 at 08:03:16AM +0300, Giorgos Keramidas wrote: > On 2006-06-02 18:07, Kris Kennaway <kris@obsecurity.org> wrote: > >On Fri, Jun 02, 2006 at 04:50:06PM -0500, Craig Boston wrote: > >>On Fri, Jun 02, 2006 at 12:35:27AM +0300, Giorgos Keramidas wrote: > >>> Ok, I'll prepare a patch that enables async and disables -M. We > >>> should also document the fact that tmpmfs=3D"YES" and varmfs=3D"YES" > >>> in rc.conf may require the presence of at least one swap device > >>> by default, and point the users to -M with a warning if they run > >>> FreeBSD without a swap device but still want to use tmpmfs or > >>> varmfs :) > >> > >> I may be mistaken, but from my (brief) reading of the code it seems > >> to me that perhaps "swap-backed" isn't an entirely accurate term. > >> More like "VM-backed", with the understanding that VM is (usually) > >> backed by swap. > >> > >> I think if you don't have any swap configured, a swap-backed md > >> will be no worse off than a memory-backed one would. > > > > Yeah, it's kind of a poorly chosen name. >=20 > Should we still revert the default from using -M for tmpmfs=3D"YES" and > varmfs=3D"YES" in rc.conf? Someone should test it in a situation without swap configured (including what is the failure mode when you run out of memory - probably a panic again), but it "should" be fine (i.e. behaves the same or better than malloc in all situations). Kris --AhhlLboLdkugWU4S Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (FreeBSD) iD8DBQFEgx1GWry0BWjoQKURAgolAJ0XauOaQf84EoQg4xKKm4pacgl0JACgrnMv 9ZWmSNxK0zhzWu7bEOJPDUk= =PhOg -----END PGP SIGNATURE----- --AhhlLboLdkugWU4S--
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