Speed of NAND flash vs. SD card (Was: Ain't it funny..)
lida_mail at 163.com
Fri May 8 01:00:37 CEST 2009
As a matter of fact, it's really slow to tar -xf .tar file, compared
with my 2440 demo board.
I takes me half a day to unzip the file system to sd card with fso
If it's with my demo board to unzip, very quick, about 10min or so.
What's wrong with fso image to unzip the tar package?
On Thu, 2009-05-07 at 17:39 +0200, Rask Ingemann Lambertsen wrote:
> On Tue, May 05, 2009 at 07:12:25AM -0600, Angus Ainslie wrote:
> > You could always use the .tar.gz on an sd card ( It boots way faster
> > that way anyway :)
> NAND flash ought to be a lot faster than Glamo's MMC interface. Where is
> the bug? FWIW, I tried a simple hdparm run on NOR flash, NAND flash and SD
> root at debian-gta02:~# hdparm --direct -t /dev/mtdblock0 # NOR flash
> Timing O_DIRECT disk reads: 2 MB in 1.24 seconds = 1.61 MB/sec
> root at debian-gta02:~# hdparm --direct -t /dev/mtdblock3 # NAND flash
> Timing O_DIRECT disk reads: 8 MB in 2.89 seconds = 2.77 MB/sec
> root at debian-gta02:~# hdparm --direct -t /dev/mmcblk0 # Glamo MMC
> Timing O_DIRECT disk reads: 8 MB in 3.46 seconds = 2.31 MB/sec
Daniel.Li <lida_mail at 163.com>
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