On Wed, Apr 25, 2012 at 06:17:48PM -0700, Eric Nelson wrote:
On 03/28/2012 07:37 AM, Jason Cooper wrote:
This patch dramatically drops the amount of time u-boot needs to read a file from an ext2 partition. On a typical 2 to 5 MB file (kernels and initrds) it goes from tens of seconds to a couple seconds.
All we are doing here is grouping contiguous blocks into one read.
Boot tested on Globalscale Technologies Dreamplug (Kirkwood ARM SoC) with three different files. sha1sums were calculated in Linux userspace, and then confirmed after ext2load.
Signed-off-by: Jason Cooperu-boot@lakedaemon.net
Tested-by: Eric Nelson eric.nelson@boundarydevices.com
Thanks for testing! I've copied your results into the commit and will be doing a pull request shortly.
thx,
Jason.
Tested on i.MX6 Sabre Lite board loading a file of ~900k:
Without patch:
MX6QSABRELITE U-Boot > time ext2load sata 0:1 12000000 /usr/lib/libperl.so.5.12.4 && crc32 12000000 $filesize Loading file "/usr/lib/libperl.so.5.12.4" from sata device 0:1 (hda1) 958032 bytes read
time: 0.414 seconds, 414 ticks CRC32 for 12000000 ... 120e9e4f ==> 550deec9
With patch: MX6QSABRELITE U-Boot > time ext2load sata 0:1 12000000 /usr/lib/libperl.so.5.12.4 && crc32 12000000 $filesize Loading file "/usr/lib/libperl.so.5.12.4" from sata device 0:1 (hda1) 958032 bytes read
time: 0.205 seconds, 205 ticks CRC32 for 12000000 ... 120e9e4f ==> 550deec9