Comment 262 for bug 620074
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7020100
(Get the code!)
Simple test case:
dd if=/dev/zero of=/tmp/bigfile bs=1M count=10000 conv=fdatasync &
sleep 10
time dd if=/dev/zero of=/tmp/smallfile bs=4k count=1 conv=fdatasync
You'd expect the small file to be written fairly quickly - as in a couple seconds at most. But on every system with a recent kernel I've tried this on, it takes 6-45 seconds.
Why the huge range? I'm not sure, but available memory seems to have something to do with it. The more memory in the machine, the larger the smallfile writes.