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author | Joel A Fernandes <joelagnel@ti.com> | 2013-05-28 19:02:55 -0500 |
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committer | Herbert Xu <herbert@gondor.apana.org.au> | 2013-06-05 16:43:05 +0800 |
commit | a3485e685faa37ba92462bec2f18b98c3c825c76 (patch) | |
tree | 7973c65bff28eeb3847e52a658f85fab561fa0f9 /drivers/char/hw_random/octeon-rng.c | |
parent | 67822649d7305caf3dd50ed46c27b99c94eff996 (diff) |
crypto: omap-aes - Don't idle/start AES device between Encrypt operations
Calling runtime PM API for every block causes serious perf hit to
crypto operations that are done on a long buffer.
As crypto is performed on a page boundary, encrypting large buffers can
cause a series of crypto operations divided by page. The runtime PM API
is also called those many times.
We call runtime_pm_get_sync only at beginning on the session (cra_init)
and runtime_pm_put at the end. This result in upto a 50% speedup as below.
This doesn't make the driver to keep the system awake as runtime get/put
is only called during a crypto session which completes usually quickly.
Before:
root@beagleboard:~# time -v openssl speed -evp aes-128-cbc
Doing aes-128-cbc for 3s on 16 size blocks: 13310 aes-128-cbc's in 0.01s
Doing aes-128-cbc for 3s on 64 size blocks: 13040 aes-128-cbc's in 0.04s
Doing aes-128-cbc for 3s on 256 size blocks: 9134 aes-128-cbc's in 0.03s
Doing aes-128-cbc for 3s on 1024 size blocks: 8939 aes-128-cbc's in 0.01s
Doing aes-128-cbc for 3s on 8192 size blocks: 4299 aes-128-cbc's in 0.00s
After:
root@beagleboard:~# time -v openssl speed -evp aes-128-cbc
Doing aes-128-cbc for 3s on 16 size blocks: 18911 aes-128-cbc's in 0.02s
Doing aes-128-cbc for 3s on 64 size blocks: 18878 aes-128-cbc's in 0.02s
Doing aes-128-cbc for 3s on 256 size blocks: 11878 aes-128-cbc's in 0.10s
Doing aes-128-cbc for 3s on 1024 size blocks: 11538 aes-128-cbc's in 0.05s
Doing aes-128-cbc for 3s on 8192 size blocks: 4857 aes-128-cbc's in 0.03s
While at it, also drop enter and exit pr_debugs, in related code. tracers
can be used for that.
Tested on a Beaglebone (AM335x SoC) board.
Signed-off-by: Joel A Fernandes <joelagnel@ti.com>
Acked-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/char/hw_random/octeon-rng.c')
0 files changed, 0 insertions, 0 deletions