Date: Fri, 22 Jan 2010 12:09:43 -0600 From: "Doug Poland" <doug@polands.org> To: "Artem Belevich" <fbsdlist@src.cx> Cc: freebsd-fs@freebsd.org Subject: Re: Repeatable ZFS "kmem map too small" panic on 8.0-STABLE Message-ID: <a4ab3938f95de65086a18607309178c4.squirrel@email.polands.org> In-Reply-To: <a8b9c9e35a14c4ada1c8f2602c91db63.squirrel@email.polands.org> References: <4B58976E.1020402@polands.org> <4B58A069.8000802@egr.msu.edu> <4B58BD2D.30803@rcn.com> <ed91d4a81001211421r4f7ba7a8n1c92bfc413e5feed@mail.gmail.com> <4B58D4D3.80009@egr.msu.edu> <20100122042843.GA8858@polands.org> <ed91d4a81001212209o3cf5955fw1eb0dd78703ad905@mail.gmail.com> <a8b9c9e35a14c4ada1c8f2602c91db63.squirrel@email.polands.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Fri, January 22, 2010 07:22, Doug Poland wrote: > On Fri, January 22, 2010 00:09, Artem Belevich wrote: >> On Thu, Jan 21, 2010 at 8:28 PM, Doug Poland <doug@polands.org> >> wrote: >>> Interesting discussion :) I added vm.kmem_size="20G" to >>> /boot/loader.conf per your instructions. This time, it didn't >>> panic at the same point in the test, however, it appears the >>> filesystem is "hanging". >>> >>> On the fdisk test, I hit <CTRL> T and get: >>> cmd: fsdisk 37066 [zio->io_cv)] 245.62r 0.12u 25.10s 0 >>> >>> My various metrics are still running, but anything that needs the >>> filesystem appears "stuck". >>> >>> The memory usage of the item "solaris" (vmstat -m | grep solaris) >>> spiked at 3334781952 (3180.30 MiB). >>> >>> # zpool iostat 2, a <CTRL> T shows: >>> load: 0.00 cmd: zpool 934 [tx->tx_quiesce_done_cv)] 2052.45r 0.06 > u 0.39s 0% 0k >>> >>> # vmstat -v | grep solaris to disk every second and it's hung at: >>> load: 0.00 cmd: sh 38551 [zfs] 909.85r 0.00u 0.00s 0% 16k >>> >>> Any suggestions! >>> >> Next step would be to set vfs.zfs.arc_max to a value that's somewhat >> below your physical memory size. Let's say - 1G or so. On my box >> with >> 8GB of RAM I set these values: >> >> vfs.zfs.arc_max="6500M" >> vfs.zfs.arc_min="4G" >> > OK, I'll give that a shot... > panic: kmem_malloc(131072): kmem_map too small: 3593236480 total allocate d # cat /boot/loader.conf vfs.root.mountfrom="zfs:bethesda" vfs.zfs.arc_max="1G" vm.kmem_size="20G" zfs_load="YES" OK, what do we do next? :) -- Regards, Doug
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?a4ab3938f95de65086a18607309178c4.squirrel>