On Wed, Feb 6, 2013 at 3:53 AM, sandeep kumar <[email protected]>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 <[email protected]> wrote: > >> Hi Sandeep >> >> >> >> On Wed, Jan 30, 2013 at 6:35 PM, sandeep kumar <[email protected]> >> wrote: >> > >> > 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... >> > 2)Copy Image(uncompressed one) from flash to RAM and run it right >> away... >> > >> > 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 > [email protected] > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > >
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