On Wed, Feb 6, 2013 at 3:53 AM, sandeep kumar [off-list ref]wrote:

Dear All
FYI:
I got the below data in my board...
For Zimage:
Copy from eMMC to RAM(bootloader) & other stuff in bootloader -- 200msec
Kernel relocation --- 1msec
Kernel uncompression -- 700msec
Total time taken --- 900msec approx

For Image:
Copy from eMMC to RAM(bootloader) & other stuff in bootloader -- 1400msec

So in case of Uncompressed kernel image.. even though it doesnt need
kernel uncompression, it is taking 500msec more in bootloader.


Thanks
Sandeep

How did you measure these times ?

On Thu, Jan 31, 2013 at 12:46 PM, Dave Hylands [off-list ref] wrote:

quoted

Hi Sandeep



On Wed, Jan 30, 2013 at 6:35 PM, sandeep kumar [off-list ref]
wrote:

quoted

Hi Dave.
Ok
Can you tell me which thing runs faster ?
1)Copy zImage(compressed kernel) from flash to Ram, jump to start,

Relocate compress kernel, uncompress it...

quoted

2)Copy Image(uncompressed one) from flash to RAM and run it right

away...

quoted

My gut feeling says second one is better, thats what i m trying to

prove here... :)

It depends on numerous factors:
1 - Your flash speed
2 - Your RAM speed
3 - Your CPU speed
4 - Whether you have code and/or data caches enabled

If you enable the caches, use DMA from NAND (so make your NAND as fast as
possible), then option 1 usually blows away option 2, but your mileage may
vary.

Dave Hylands

--
With regards,
Sandeep Kumar Anantapalli,

_______________________________________________
Kernelnewbies mailing list
Kernelnewbies at kernelnewbies.org
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20130206/fa27bd4a/attachment-0001.html