aboutsummaryrefslogtreecommitdiff
path: root/drivers
diff options
context:
space:
mode:
authorChristian Lamparter <chunkeey@gmail.com>2017-10-04 01:00:08 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2017-10-12 22:55:11 +0800
commit778f81d6cdb7d25360f082ac0384d5103f04eca5 (patch)
tree706ec3b3c29012fc0feb687a1074888498a1ecd6 /drivers
parent333eb3edda3842f3e5dbd723cb18bbe47eb0508b (diff)
downloadlinux-778f81d6cdb7d25360f082ac0384d5103f04eca5.tar.gz
crypto: crypto4xx - increase context and scatter ring buffer elements
If crypto4xx is used in conjunction with dm-crypt, the available ring buffer elements are not enough to handle the load properly. On an aes-cbc-essiv:sha256 encrypted swap partition the read performance is abyssal: (tested with hdparm -t) /dev/mapper/swap_crypt: Timing buffered disk reads: 14 MB in 3.68 seconds = 3.81 MB/sec The patch increases both PPC4XX_NUM_SD and PPC4XX_NUM_PD to 256. This improves the performance considerably: /dev/mapper/swap_crypt: Timing buffered disk reads: 104 MB in 3.03 seconds = 34.31 MB/sec Furthermore, PPC4XX_LAST_SD, PPC4XX_LAST_GD and PPC4XX_LAST_PD can be easily calculated from their respective PPC4XX_NUM_* constant. Signed-off-by: Christian Lamparter <chunkeey@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/crypto/amcc/crypto4xx_core.h10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/crypto/amcc/crypto4xx_core.h b/drivers/crypto/amcc/crypto4xx_core.h
index 97fb8288ab30..27e439c1f5bf 100644
--- a/drivers/crypto/amcc/crypto4xx_core.h
+++ b/drivers/crypto/amcc/crypto4xx_core.h
@@ -36,12 +36,12 @@
#define PPC405EX_CE_RESET 0x00000008
#define CRYPTO4XX_CRYPTO_PRIORITY 300
-#define PPC4XX_LAST_PD 63
-#define PPC4XX_NUM_PD 64
-#define PPC4XX_LAST_GD 1023
+#define PPC4XX_NUM_PD 256
+#define PPC4XX_LAST_PD (PPC4XX_NUM_PD - 1)
#define PPC4XX_NUM_GD 1024
-#define PPC4XX_LAST_SD 63
-#define PPC4XX_NUM_SD 64
+#define PPC4XX_LAST_GD (PPC4XX_NUM_GD - 1)
+#define PPC4XX_NUM_SD 256
+#define PPC4XX_LAST_SD (PPC4XX_NUM_SD - 1)
#define PPC4XX_SD_BUFFER_SIZE 2048
#define PD_ENTRY_INUSE 1