path: root/Documentation/blockdev
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authorSergey Senozhatsky <sergey.senozhatsky@gmail.com>2014-04-07 15:38:07 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-07 16:36:00 -0700
commite64cd51d2fa87733176246101df871a8ac5c7c20 (patch)
tree45e18d7863479c0c26504499025c115a57779b7c /Documentation/blockdev
parent59fc86a4922f1a1c0f69eac758a7e2b2b138aab4 (diff)
zram: move zram size warning to documentation
Move zram warning about disksize and size of memory correlation to zram documentation. Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Acked-by: Minchan Kim <minchan@kernel.org> Cc: Jerome Marchand <jmarchan@redhat.com> Cc: Nitin Gupta <ngupta@vflare.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/blockdev')
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
+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

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