On Apr 29, 2010, at 9:44 AM, Tom Evans wrote: > On Thu, Apr 29, 2010 at 3:53 PM, Ollivier Robert > <robe...@keltia.freenix.fr> wrote: >> According to James R. Van Artsdalen: >>> system is a Core i7 975 (3.33 GHz x 4 cores 3x threads per core) with 12 >>> GB of RAM, a 2x2TB ZFS boot pool and a second (idle) pool of 16x2TB. >> >>> panic: kmem_malloc(131072): kmem_map too small: 3832475648 total allocated >> >> Apart from the fact that you must at least set vm.kmem_size to something >> like 2x your RAM, one rule of thumb I've seen discussed for ZFS is that you >> will need approximatively 1 GB of RAM per TB of data so you may be a bit >> short here to get optimal perfs. >> > > Citation needed? I have a file server running amd64 8-STABLE with 4GB > of RAM, 6 x 1.5 TB drives in raidz, and have never had any problems > with memory usage. Are you saying that after my next update, adding > another 6 x 1.5 TB drives, it will start being flaky and/or panicing > with kmem_map too small errors? >
I'm sorry, but I find it absolutely absurd that any filesystem has to wire down 2GB of RAM, and that the solution to panics is buy more RAM. Scott _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
