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dm crypt: increase mempool reserve to better support swapping
authorMikulas Patocka <mpatocka@redhat.com>
Fri, 15 Jul 2016 21:30:20 +0000 (17:30 -0400)
committerMike Snitzer <snitzer@redhat.com>
Mon, 15 Aug 2016 13:23:14 +0000 (09:23 -0400)
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 patch | blob | blame | history

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 4e9784b4e0ac655659a521d7427658e44ad6bf7d..eedba67b0e3ef6bed544b959d8440a5433c6bc75 100644 (file)
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -181,7 +181,7 @@ struct crypt_config {
        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);