From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Dan Williams" Subject: Re: Benchmarks: Linux Kernel RAID vs a Hardware RAID setup Date: Wed, 16 Jul 2008 00:00:44 -0700 Message-ID: References: <1216130769.5633.318.camel@sam.localdomain> <487CC660.9030004@ziu.info> <1216179392.5633.348.camel@sam.localdomain> <487D7139.5050302@sauce.co.nz> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <487D7139.5050302@sauce.co.nz> Content-Disposition: inline Sender: linux-raid-owner@vger.kernel.org To: Richard Scobie Cc: Ben Martin , linux-raid@vger.kernel.org List-Id: linux-raid.ids On Tue, Jul 15, 2008 at 8:55 PM, Richard Scobie wrote: > Ben Martin wrote: > >> I have been meaning to ask for a while, why is the stripe_cache_size >> set so low by default if it has such an effect on performance? > > I can't comment on the above, but looking at this: > > http://marc.info/?l=linux-raid&m=120668318422034&w=2 > > with the 2.6.26 release, bumping up the stripe cache should no longer be > necessary. > To be clear bumping up the cache size can still increase performance but the ratio of performance/stripe_cache_size should now be larger, i.e. more sequential write performance at smaller cache sizes. > Regards, > > Richard -- Dan