On 24 April 2011 17:21, Sergio de Almeida Lenzi <lenzi.ser...@gmail.com>wrote:
> Em Ter, 2011-04-12 às 13:33 +0200, Lars Wilke escreveu: > > > Hi, > > > > There are quite a few threads about ZFS and performance difficulties, > > but i did not find anything that really helped :) > > Therefor any advice would be highly appreciated. > > I started to use ZFS with 8.1R, only tuning i did was setting > > > > vm.kmem_size_scale="1" > > vfs.zfs.arc_max="40000M" > > For me I solved the ZFS performace in FreeBSD and postgres databases > (about 100GB size) > by tunning vm.kmem_size to atout 3/4 of the ram size... > in your case, vm.kmem_size=(48 *3/4)=36G, it puts almost all the > database > in memory and it is now lightning fast... > I use to disable prefetch in zfs.. too > > Hope this can help, > > Sergio > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to " > freebsd-questions-unsubscr...@freebsd.org" > wouldnt it be better to allow the db to use the memory rather than zfs, as this would involve far less context switches? _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
