Date: Sun, 6 Mar 2011 02:59:43 -0500 From: Joshua Boyd <boydjd@jbip.net> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: freebsd-fs@freebsd.org Subject: Re: kmem_map too small with ZFS and 8.2-RELEASE Message-ID: <AANLkTimrdnxsxUpmZnr3=w5J8_46ZM91crEfY6c_ZR4z@mail.gmail.com> In-Reply-To: <20110304105608.GA23887@icarus.home.lan> References: <1299232133.18671.3.camel@pc286.embl.fr> <20110304100517.GA23249@icarus.home.lan> <AANLkTikQiTi25TR6uDD2umRZQrOL8YZzEC960oWf4wax@mail.gmail.com> <20110304105608.GA23887@icarus.home.lan>
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On Fri, Mar 4, 2011 at 5:56 AM, Jeremy Chadwick <freebsd@jdc.parodius.com> wrote: > If you get better performance -- really, truly, honestly -- with > prefetch enabled on your system, then I strongly recommend you keep it > enabled. =A0However, for what it's worth (probably not much), this is the > first I've ever heard of a FreeBSD system performing better with > prefetch enabled. I just recently turned it on after having it turned off for a long time ... my speeds went from ~300MB/s to 600+MB/s in bonnie++. This is a dual core AM3 system with 8GB of ram, and 15 disks in a striped raidz configuration (3 sets striped). --=20 Joshua Boyd JBipNet E-mail: boydjd@jbip.net http://www.jbip.net
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