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-rw-r--r--Documentation/blockdev/zram.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt
index 2eccddffa6c8..393541be1ec0 100644
--- a/Documentation/blockdev/zram.txt
+++ b/Documentation/blockdev/zram.txt
@@ -33,6 +33,11 @@ Following shows a typical sequence of steps for using zram.
echo 512M > /sys/block/zram0/disksize
echo 1G > /sys/block/zram0/disksize
+Note:
+There is little point creating a zram of greater than twice the size of memory
+since we expect a 2:1 compression ratio. Note that zram uses about 0.1% of the
+size of the disk when not in use so a huge zram is wasteful.
+
3) Activate:
mkswap /dev/zram0
swapon /dev/zram0