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Date:      Sun, 22 Nov 2009 09:44:03 +0900
From:      Randy Bush <randy@psg.com>
To:        Jeremy Chadwick <freebsd@jdc.parodius.com>
Cc:        freebsd-stable@freebsd.org
Subject:   Re: 7.2 dies in zfs
Message-ID:  <m2ljhzgzho.wl%randy@psg.com>
In-Reply-To: <20091122002926.GA19628@icarus.home.lan>
References:  <m2skcajavv.wl%randy@psg.com> <m2r5ruja6v.wl%randy@psg.com> <4B066B13.1070006@freebsd.org> <m2bpiwitz7.wl%randy@psg.com> <4b07ac59.A2Afaf4X0IZlrgGU%perryh@pluto.rain.com> <57200BF94E69E54880C9BB1AF714BBCBA5722E@w2003s01.double-l.local> <20091121193643.GA14122@icarus.home.lan> <790a9fff0911211159k14920410g7a76cf6a292f0bae@mail.gmail.com> <20091122002926.GA19628@icarus.home.lan>

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> Everyone's workloads are different, but the panic is the same every
> time: kmem exhaustion.  i386 with KVA_PAGES or amd64 -- happens on both.
> It's highly dependent upon workload and what the filesystem consists of
> (many files vs. fewer files but larger in size, etc.)

these are measurable.  at least until it crashes.  the suggested memsz
script could, instead of giving what to a naive admin are some cute but
unhepful numbers, suggest values for loader.conf.local.

randy



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