| From foo@baz Thu Dec 21 09:02:40 CET 2017 |
| From: Christian Lamparter <chunkeey@gmail.com> |
| Date: Wed, 4 Oct 2017 01:00:08 +0200 |
| Subject: crypto: crypto4xx - increase context and scatter ring buffer elements |
| |
| From: Christian Lamparter <chunkeey@gmail.com> |
| |
| |
| [ Upstream commit 778f81d6cdb7d25360f082ac0384d5103f04eca5 ] |
| |
| 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> |
| Signed-off-by: Sasha Levin <alexander.levin@verizon.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| --- |
| drivers/crypto/amcc/crypto4xx_core.h | 10 +++++----- |
| 1 file changed, 5 insertions(+), 5 deletions(-) |
| |
| --- a/drivers/crypto/amcc/crypto4xx_core.h |
| +++ b/drivers/crypto/amcc/crypto4xx_core.h |
| @@ -34,12 +34,12 @@ |
| #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 |
