Date: Fri, 4 Mar 2011 11:30:04 +0100 From: Matthias Gamsjager <mgamsjager@gmail.com> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: freebsd-fs@freebsd.org, =?ISO-8859-1?Q?Micka=EBl_Can=E9vet?= <canevet@embl.fr> Subject: Re: kmem_map too small with ZFS and 8.2-RELEASE Message-ID: <AANLkTikQiTi25TR6uDD2umRZQrOL8YZzEC960oWf4wax@mail.gmail.com> In-Reply-To: <20110304100517.GA23249@icarus.home.lan> References: <1299232133.18671.3.camel@pc286.embl.fr> <20110304100517.GA23249@icarus.home.lan>
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> # Disable ZFS prefetching > # http://southbrain.com/south/2008/04/the-nightmare-comes-slowly-zfs.html > # Increases overall speed of ZFS, but when disk flushing/writes occur, > # system is less responsive (due to extreme disk I/O). > # NOTE: Systems with 8GB of RAM or more have prefetch enabled by > # default. > vfs.zfs.prefetch_disable="1" > > > I wonder if this is still the case since the website you referring to was from 2008 and I guess a lot has changed since then. For example I get horrible performance with prefech disabled. (running on 4 disk striped mirror)
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