Minchan, FYI, I re-done the test (untouched almost_empty waterline). Kernel log test started [ 788.064886] test ended [ 4025.914190] test (doing `cp' in parallel): (a) for i in {1..X}; do cp -R ~/git .; sync; rm -fr git/; done # compiled kernel, with object files. 2.2G (b) for i in {1..X}; do cp -R ~/linux/ .; sync; rm -fr linux/; done (c) for i in {1..X}; do cp -R ~/glibc/ .; sync; rm -fr glibc/; done Minimal si_meminfo(&si)->si.freeram observed on the system was: 6390 cat /sys/block/zram0/stat 31253 0 250024 316 12281689 0 98253512 141263 0 141590 141763 cat /sys/block/zram0/mm_stat 3183374336 2105262569 2140762112 0 2821394432 1864 358173 The results are: compaction nr:2335 (full:953 part:60956) ratio: 0.01539 (~1.53% of classes were fully compacted) More or less same numbers. -ss -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx"> email@xxxxxxxxx </a>