Date: Sun, 06 Jan 2008 18:20:52 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-current@freebsd.org Subject: Re: When will ZFS become stable? Message-ID: <flr2lr$kph$1@ger.gmane.org> In-Reply-To: <47810BE3.4080601@FreeBSD.org> References: <fll63b$j1c$1@ger.gmane.org> <20080104163352.GA42835@lor.one-eyed-alien.net> <9bbcef730801040958t36e48c9fjd0fbfabd49b08b97@mail.gmail.com> <200801061051.26817.peter.schuller@infidyne.com> <9bbcef730801060458k4bc9f2d6uc3f097d70e087b68@mail.gmail.com> <4780D289.7020509@FreeBSD.org> <flqmbo$eac$1@ger.gmane.org> <4780E546.9050303@FreeBSD.org> <9bbcef730801060651y489f1f9bw269d0968407dd8fb@mail.gmail.com> <4780EF09.4090908@FreeBSD.org> <flr0ie$euj$1@ger.gmane.org> <47810BE3.4080601@FreeBSD.org>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigBF0E8DBB5E5B643C0C0784B4 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable Kris Kennaway wrote: > > Better yet, why not >> increase both vm.kmem_size and KVA_PAGES to (the equivalent of) 640 MB= =20 >> or 768 MB by default for 7.0? >=20 > That is answered in the tuning guide. Tuning KVA_PAGES by default is=20 > not appropriate. Ok. I'd like to understand what is the relationship between KVA_PAGES=20 and vm.kmem_size. The tuning guide says: """By default the kernel receives 1GB of the 4GB of address space=20 available on the i386 architecture, and this is used for all of the=20 kernel address space needs, not just the kmem map. By increasing=20 KVA_PAGES you can allocate a larger proportion of the 4GB address=20 space...""" and: """recompile your kernel with increased KVA_PAGES option, to increase=20 the size of the kernel address space, before vm.kmem_size can be=20 increased beyond 512M""" What is the other 512 MB of the 1 GB used for? --------------enigBF0E8DBB5E5B643C0C0784B4 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHgQ36ldnAQVacBcgRArjoAJ4+6LvxL9bOjNOIHLiCA5rs2o99hACfZlBl mQUKsJ1MR9ZyUXbn5EoYyKE= =d0JH -----END PGP SIGNATURE----- --------------enigBF0E8DBB5E5B643C0C0784B4--
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