On Wed, Mar 10, 2010 at 11:13 PM, Gordan Bobic <gor...@bobich.net> wrote: > Marcus Fritzsch wrote: >> >> Hi there, >> >> On Wed, Mar 10, 2010 at 8:49 PM, Gordan Bobic <gor...@bobich.net> wrote: >>> >>> [...] >>> Are there similar optimizations available in BTRFS? >> >> There is an SSD mount option available[1]. >> >> [1] http://btrfs.wiki.kernel.org/index.php/Getting_started#Mount_Options > > But what _exactly_ does it do?
Chris explains the change to favour spatial locality in allocator behaviour in with '-o ssd'. '-o ssd_spread' does the opposite, where RMW cycles are higher penalty. Elsewhere IIRC, Chris also said BTRFS attempts to submit 128KB BIOs where possible (or wishful thinking?): http://markmail.org/message/4sq4uco2lghgxzzz -- Daniel J Blueman -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
