Date: Mon, 24 Sep 2007 13:15:58 +0400 From: Ruslan Ermilov <ru@FreeBSD.org> To: Kris Kennaway <kris@FreeBSD.org> Cc: Darren Reed <darrenr@FreeBSD.org>, freebsd-current@FreeBSD.org, Larry Rosenman <ler@lerctr.org> Subject: Re: panic: kmem_malloc(131072): kmem_map too small (AMD64) Message-ID: <20070924091558.GB32006@team.vega.ru> In-Reply-To: <46F58B21.8030307@FreeBSD.org> References: <20070921102946.T11189@borg> <46F415BF.9010500@FreeBSD.org> <20070921140550.D96923@thebighonker.lerctr.org> <46F41CFF.6080108@FreeBSD.org> <46F58799.1030702@freebsd.org> <46F58B21.8030307@FreeBSD.org>
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On Sat, Sep 22, 2007 at 11:37:37PM +0200, Kris Kennaway wrote: > Darren Reed wrote: >> Kris Kennaway wrote: >>> Larry Rosenman wrote: >>>> On Fri, 21 Sep 2007, Kris Kennaway wrote: >>>> >>>>> Larry Rosenman wrote: >>>>>> I'm a heavy ZFS user, and got the following panic on 2007-09-18 >>>>>> source/world: >>>>> >>>>> This is a FAQ, please see the archives (you need to increase the >>>>> vm.kmem_size to provide more memory to ZFS). >>>> >>>> I thought that was only for i386, and it hadn't been an issue before. >>> >>> Nope. It is also load-dependent. >> So I just received this courtesy of ZFS: >> panic: kmem_malloc(131072): kmem_map too small: 343027712 total allocated >> cpuid = 0 >> KDB: enter: panic >> This was with these settings in loader.conf: >> vm.kmem_size=419430400 >> vm.kmem_size_max=419430400 Setting both doesn't make sense; kmem_size will take over. kmem_size_max only limits the automatically computed value of kmem_size, which is: /* * How many physical pages per KVA page allocated. * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), * VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX) * is the total KVA space allocated for kmem_map. */ >> vfs.zfs.arc_max=409715200 >> (That's 400M, 400M and 40M, respectively.) >> Stupid question, perhaps, but is vm.kmem_size/vm.kmem_size_max limited by >> physical RAM? > > Yes. > To be precise, it's actually limited by 2 * sizeof(physical RAM). It's still size of a _virtual_ memory map (kmem_map), after all: : /* : * Limit kmem virtual size to twice the physical memory. : * This allows for kmem map sparseness, but limits the size : * to something sane. Be careful to not overflow the 32bit : * ints while doing the check. : */ : if (((vm_kmem_size / 2) / PAGE_SIZE) > cnt.v_page_count) : vm_kmem_size = 2 * cnt.v_page_count * PAGE_SIZE; Cheers, -- Ruslan Ermilov ru@FreeBSD.org FreeBSD committer
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