1.first read:
dd if=test.long of=test.long2
skopiowane 9682944 bajty (9,7 MB), 246,865 s, 39,2 kB/s
2.second read (file is cached)
dd if=test.long of=test.long2
skopiowane 9682944 bajty (9,7 MB), 0,0677105 s, 143 MB/s
3.drop cache and read file again
echo 1 > /proc/sys/vm/drop_caches
dd...