Ok after much debugging it appears there is a bug in the elevator
affecting the merging of read-ahead requests. This is exposed horribly
by the sequential scan of the FAT as required to calculate the current
free information for a FAT filesystem on first mount. I think we have
it nailed and have produced some test kernels with the fix. If you
could test those and report back here that would be very useful.
Kernels will be at the URL below shortly:
http://people.canonical.com/~apw/lp444915-karmic/
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regression: statfs() takes a long time on VFAT without "usefree"
https://bugs.launchpad.net/bugs/444915
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