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authorJoel A Fernandes <joelagnel@ti.com>2013-05-28 19:02:55 -0500
committerHerbert Xu <herbert@gondor.apana.org.au>2013-06-05 16:43:05 +0800
commita3485e685faa37ba92462bec2f18b98c3c825c76 (patch)
tree7973c65bff28eeb3847e52a658f85fab561fa0f9 /drivers/char/hw_random/octeon-rng.c
parent67822649d7305caf3dd50ed46c27b99c94eff996 (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