Dnia 2010-01-06, śro o godzinie 12:49 +0300, Gennady Kupava pisze: > hi all, > > I still don't beleive our device should be so slow as it is now. I'll > try to investigate performance impact of several kernel option. I > expect, changes will be introduced to defalt config for distributions. > Here is first one CONFIG_MTD_NAND_VERIFY_WRITE. > > Now it is enabled. > > I build kernel with and without this option, and did read and write > tests to /dev/mtd6 and /dev/mtdblock6. all tests done with dd > to/from /dev/zero bs=256k count=200. read is just for check. > > most data in Mb/s. > > mtd6-rd, mtd6-wt, mtdblock6-rd, mtdblock6-wt > > option on 5.2, 4.8, 2.6, 900kb/s > > option off 5.2, 2.4, 2.6, 712kb/s > Well, if this test was repeated several times with similar results, it might be worth to disable this option IMHO. Only one thing makes me dither. Will this be safe? I mean, what if there is some software which takes advantage of this option? Maybe some kind of software which verifies (using this kernel option) what it writes to device? Just a thought...
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