Date: Fri, 24 Jul 2015 02:54:00 +0200 From: Michelle Sullivan <michelle@sorbs.net> To: Glen Barber <gjb@FreeBSD.org> Cc: Mark Linimon <linimon@lonesome.com>, Brandon Allbery <allbery.b@gmail.com>, freebsd-stable <freebsd-stable@freebsd.org>, Jason Unovitch <jason.unovitch@gmail.com>, herbert@oslo.ath.cx Subject: Re: 10.2-Beta i386..what's wrong..? Message-ID: <55B18CA8.1020909@sorbs.net> In-Reply-To: <20150724004939.GN84931@FreeBSD.org> References: <55B17B7A.4080402@gmail.com> <20150723234805.GK84931@FreeBSD.org> <55B18488.9060602@sorbs.net> <20150724004026.GA1370@lonesome.com> <CAKFCL4VVtLspj%2BRQxSHjyQxAhixPuMiQoehoA2MYWeSgqTTwAQ@mail.gmail.com> <20150724004343.GM84931@FreeBSD.org> <20150724004443.GC1370@lonesome.com> <20150724004939.GN84931@FreeBSD.org>
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Glen Barber wrote: > On Thu, Jul 23, 2015 at 07:44:43PM -0500, Mark Linimon wrote: > >> On Fri, Jul 24, 2015 at 12:43:43AM +0000, Glen Barber wrote: >> >>> Even on amd64, you need to tune the system with less than 4GB RAM. >>> >> The only correct answer to "how much RAM do you need to run ZFS" is >> "always more" AFAICT. >> >> > > There's a bit more to it than that. You *can* successfully run amd64 > ZFS system with certain tunings (vfs.kmem_max IIRC), but you also need > to adjust things like disabling prefetching with less than 4GB RAM > (accessible to the OS). > > So yeah, "more RAM" is always a thing in this playing field. > > Glen > > Actually I'm quite sucessfully running zfs on i386 (in a VM) ... here's the trick (which leads me to suspect ARC handling as the problem) - when I get to 512M of kernel space or less than 1G of RAM available system wide, I export/import the zfs pool... Using this formula I have uptimes of months... I haven't yet tried the 'ARC patch' that was proposed recently... -- Michelle Sullivan http://www.mhix.org/
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