Date: Wed, 9 Mar 2011 13:28:50 +0000 From: Tom Evans <tevans.uk@googlemail.com> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: Matthias Andree <matthias.andree@gmx.de>, freebsd-stable@freebsd.org Subject: Re: ZFS performance as the FS fills up? Message-ID: <AANLkTimMct3Ni0p7CBsmNJmW_t6e75mZcHhQ8dppQbCb@mail.gmail.com> In-Reply-To: <20110309125132.GB62338@icarus.home.lan> References: <BD2C8439-AC1E-49CB-ABE2-9F7F0B292933@punkt.de> <20110308114810.GA37554@icarus.home.lan> <4D775CF1.1010501@gmx.de> <20110309125132.GB62338@icarus.home.lan>
next in thread | previous in thread | raw e-mail | index | archive | help
On Wed, Mar 9, 2011 at 12:51 PM, Jeremy Chadwick <freebsd@jdc.parodius.com> wrote: > > Otherwise, I can imagine that prefetching could cause what you describe, > which is enabled by default in 8.0 and 8.1 and auto-disables in 8.2 if > the amount of available memory is less than 4GB. > I don't think this is accurate. Prefetch was certainly disabled by default on 8.0 if you had 4GB of RAM or less, requiring the sysctl vfs.zfs.prefetch_disable=0 to be set if you wanted prefetch and had 4GB of RAM or less. Cheers Tom
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?AANLkTimMct3Ni0p7CBsmNJmW_t6e75mZcHhQ8dppQbCb>