"Disk" bandwidth

Andy Green andy at openmoko.com
Wed Nov 26 20:12:43 CET 2008


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Somebody in the thread at some point said:

| The kernel used is the "stable" one from several weeks back and I heard
| that the NAND access has been improved in the mean time, which is great.
| But what about uSD access?  Is that really the best we can hope for?

No it used to be faster than that, ~2MBytes/sec IIRC.

Do you have GPS powered up?

| And it seems that the uSD access is not cached.  Why is that?  Can it
| be changed?

"cached" for hdparm means cached in drive memory, rather than block
device memory in Linux, as I understood it, but then I don't know why
/dev/mtdblock does any different than /dev/mmcblk.

- -Andy
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