From mboxrd@z Thu Jan 1 00:00:00 1970 From: Phil Sutter Date: Mon, 26 Aug 2013 18:06:13 +0200 Subject: [U-Boot] [PATCHv4] Optimized nand_read_buf for kirkwood In-Reply-To: <20130826160039.GC25560@philter.vipri.net> References: <1377519056-25364-1-git-send-email-phil.sutter@viprinet.com> <1377531818.3033.1.camel@snotra.buserror.net> <20130826160039.GC25560@philter.vipri.net> Message-ID: <20130826160613.GD25560@philter.vipri.net> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On Mon, Aug 26, 2013 at 06:00:39PM +0200, Phil Sutter wrote: > On Mon, Aug 26, 2013 at 10:43:38AM -0500, Scott Wood wrote: > > On Mon, 2013-08-26 at 14:10 +0200, Phil Sutter wrote: > > > From: Nico Erfurth > > > > > > The basic idea is taken from the linux-kernel, but further optimized. > > > > > > First align the buffer to 8 bytes, then use ldrd/strd to read and store > > > in 8 byte quantities, then do the final bytes. > > > > > > Tested using: 'date ; nand read.raw 0xE00000 0x0 0x10000 ; date'. > > > Without this patch, NAND read of 132MB took 49s (~2.69MB/s). With this > > > patch in place, reading the same amount of data was done in 27s > > > (~4.89MB/s). So read performance is increased by ~80%! > > > > > > Signed-off-by: Nico Erfurth > > > Tested-by: Phil Sutter > > > Cc: Prafulla Wadaskar > > > --- > > > Changed since V3: > > > - fixed author > > > > It needs your Signed-off-by: as well -- can I add that when applying? > > Yes, that's fine by me. So if I submit others' patches, I need to sign > them off as well? Ah, nevermind. Reading 1.12 of Documentation/SubmittingPatches helps. Best wishes, Phil Sutter Software Engineer -- Viprinet Europe GmbH Mainzer Str. 43 55411 Bingen am Rhein Germany Phone/Zentrale: +49 6721 49030-0 Direct line/Durchwahl: +49 6721 49030-134 Fax: +49 6721 49030-109 phil.sutter at viprinet.com http://www.viprinet.com Registered office/Sitz der Gesellschaft: Bingen am Rhein, Germany Commercial register/Handelsregister: Amtsgericht Mainz HRB44090 CEO/Gesch?ftsf?hrer: Simon Kissel