commit 0a83df6c8cacafbefc5b56b2fbcb92b0d75b744b
author Mikulas Patocka <mpatocka@redhat.com> Fri Jul 15 17:30:20 2016 -0400
committer Mike Snitzer <snitzer@redhat.com> Mon Aug 15 09:23:14 2016 -0400
tree 73aaaffa807cffe67c08967e73cc0d7e3a3f2ff8
parent 802934b2cfde463b72cc1b9bc1c081895a90be53

dm crypt: increase mempool reserve to better support swapping

Increase mempool size from 16 to 64 entries.  This increase improves
swap on dm-crypt performance.

When swapping to dm-crypt, all available memory is temporarily exhausted
and dm-crypt can only use the mempool reserve.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

drivers/md/dm-crypt.c

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 4e9784b..eedba67 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -181,7 +181,7 @@
 	u8 key[0];
 };
 
-#define MIN_IOS        16
+#define MIN_IOS        64
 
 static void clone_init(struct dm_crypt_io *, struct bio *);
 static void kcryptd_queue_crypt(struct dm_crypt_io *io);