Pierre Ossman <drzeus-list@xxxxxxxxx> writes: > On Sat, 23 Aug 2008 08:59:11 +0900 > OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx> wrote: > >> Pierre Ossman <drzeus-list@xxxxxxxxx> writes: >> > >> > I have tried those two and others, and I cannot see any noticeable >> > difference in performance. Please perform your own tests though as I >> > might have overlooked something. >> >> I see, sounds like erase commands of sd/mmc was ignored. > > If only. :) Yes :) > The device does take some time to perform the command, and the data is > indeed gone after the command has completed. So there is no doubt that > the sector gets erased. > > It might simply be that so few (no?) SD/MMC readers actually implement > these commands, so the card vendors haven't bothered implementing any > decent handling of them. I see. Umm... Or. The pre-erased card has no improvement. So, the card may be doing wear-leveling (ERASE_BLK_EN=1 may imply?), and write bandwidth is slow enough, it might hide the slowness of erase well... -- OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
