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 ne@erfurth.eu
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 ne@erfurth.eu Tested-by: Phil Sutter phil.sutter@viprinet.com Cc: Prafulla Wadaskar prafulla@marvell.com
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