From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wolfgang Denk Date: Wed, 09 Dec 2009 12:02:22 +0100 Subject: [U-Boot] [PATCH RFC] NAND: Improve read performance from Large Page NAND devices In-Reply-To: <20091208220602.8796A19F3F@gemini.denx.de> References: <4B1E71D9.6080802@ge.com> <20091208220602.8796A19F3F@gemini.denx.de> Message-ID: <20091209110222.2AC613F6CC@gemini.denx.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Dear Nick Thompson, In message <4B1E71D9.6080802@ge.com> you wrote: > Improve read performance from Large Page NAND devices. > > This patch produces a ~31% improvement in oob_first read speed (on a > 300MHz ARM9). The time for a mid-buffer 2k page read is now 293us, > 6.99MB/s (was 385us, 5.31MB/s). oob_first is probably the best case > improvement. > > Signed-off-by: Nick Thompson Also tested on Canyonlands (460EX); here I actually see a slightj improvement (5.5% faster, i. e. time to read 126 MB from NAND goes down from 28.8 to 27.2 seconds (4.4 -> 4.6 MiB/s). Tested-by: Wolfgang Denk Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de Any time things appear to be going better, you have overlooked some- thing.