Hi,
I noticed that several random IO-heavy Firefox files got fragmented
easily. Our cache suffers most.
The cache works by creating a flat file and storing fixed-size entries
in it. I though if I fallocate() the file first, then all of the writes
within the allocated area would not cause additional fragmentation.
This doesn't seem to completely cure fragmentation with ext4 in 2.6.33.
If I allocate a 4mb file, it gets more and more fragmented over time.
fallocate() does reduce fragmentation, but not as much as I expected.
I assumed that writing to an fallocate()ed area will not cause
additional fragmentation. Is my assumption incorrect?
Thanks,
Taras
ps. I'm using filefrag for measuring fragmentation.
ps2. Does running filefrag on a directory mean anything in ext4?
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