After reading the paper in the link below:
https://lwn.net/Articles/428584/
I think the slow writing to my sd card is not strange, see below:
- my card is a kingston class 4 card, not a "high speed" card
- writing to sd card is a slow action because of storage feature of sd card,
also
optimization inside card is often done as assumption of fat fs, see both
details in
the link above
- the partition for rootfs is not segment aligned, which is also pointed by the
paper
(had observed the unalignement before, almost the start sector number in each
access is
odd number)
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https://bugs.launchpad.net/bugs/784421
Title:
natty slow boot on pandaboard(rev A1)
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