OK, #1, can you try doing an experiment with "cp -r <src-path> <dest-path>", and tell me whether the copy speed is faster or slower, and whether the CPU utilization is faster or slower? Even if it's a bit slower to use cp -r, it will be easier for us to try to reproduce things and to understand what cp -r is doing as opposed to some mystery java program. #2, if you know how to set up ftrace, can you enable the ext4_mballoc_alloc tracepoint and send me a sample output (a few hundred lines will be plenty). The short version is basically: <start your java copy program> echo 1 > /sys/kernel/debug/tracing/events/ext4/ext4_mballoc_alloc/enable <wait 30 seconds> cat /sys/kernel/debug/tracing/trace > /var/tmp/trace-save echo 0 > /sys/kernel/debug/tracing/events/ext4/ext4_mballoc_alloc/enable - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
