Dear chris c, In message <[email protected]> you wrote: > > I was comparing time just by timing it manually. How did you instrument > u-boot to display the time?
That's no instrumentation of U-Boot, but just timestamping the output on the serial console. See for example ftp://ftp.denx.de/pub/tools/time_log > As for the small versus large file, I did the same test for 1MB of data > using nand read and saw a x4 performance advantage. I also did a test on > mmc with 100 MB file and saw no performance increase. Looks like file size > doesn't matter. > > So does that mean that MMC file loading will not benefit from dcache > enabled? Can anybody explain this? It depends on where the time is actually spent. If you have a slow (say, bit-banging) MMC driver and a low-performance CPU then the transfer from MMC might simply not depend as much on caches. It is wrong to check just a simple use case. Try a number of different operations, like umcompressing a large image in RAM or from NOR to RAM, or downloading over the net, or ... Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: [email protected] "Remember, Information is not knowledge; Knowledge is not Wisdom; Wisdom is not truth; Truth is not beauty; Beauty is not love; Love is not music; Music is the best." - Frank Zappa _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
