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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[-- Attachment #1 --] Kris Kennaway wrote: > > Better yet, why not >> increase both vm.kmem_size and KVA_PAGES to (the equivalent of) 640 MB >> or 768 MB by default for 7.0? > > That is answered in the tuning guide. Tuning KVA_PAGES by default is > not appropriate. Ok. I'd like to understand what is the relationship between KVA_PAGES and vm.kmem_size. The tuning guide says: """By default the kernel receives 1GB of the 4GB of address space available on the i386 architecture, and this is used for all of the kernel address space needs, not just the kmem map. By increasing KVA_PAGES you can allocate a larger proportion of the 4GB address space...""" and: """recompile your kernel with increased KVA_PAGES option, to increase the size of the kernel address space, before vm.kmem_size can be increased beyond 512M""" What is the other 512 MB of the 1 GB used for? [-- Attachment #2 --] -----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-----
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