From: Joel A Fernandes Date: Wed, 29 May 2013 00:02:55 +0000 (-0500) Subject: crypto: omap-aes - Don't idle/start AES device between Encrypt operations X-Git-Tag: v3.11-rc1~82^2~16 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a3485e685faa37ba92462bec2f18b98c3c825c76;p=pandora-kernel.git 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 Acked-by: Kevin Hilman Signed-off-by: Herbert Xu --- Reading git-diff-tree failed