On Thu, Aug 20, 2020 at 06:54:58AM -0700, Ben Greear wrote: > > Here's a run on an: Intel(R) Core(TM) i7-7700T CPU @ 2.90GHz > > testing speed of async cmac(aes-aesni) (cmac(aes-aesni)) > > [ 259.397910] tcrypt: test 8 ( 1024 byte blocks, 1024 bytes per update, 1 updates): 8442 cycles/operation, 8 cycles/byte > > testing speed of async cmac(aes-generic) (cmac(aes-generic)) > > [ 294.171530] tcrypt: test 8 ( 1024 byte blocks, 1024 bytes per update, 1 updates): 9022 cycles/operation, 8 cycles/byte > > On my slow apu2 board with processor: AMD GX-412TC SOC > > testing speed of async cmac(aes-aesni) (cmac(aes-aesni)) > > [ 51.751810] tcrypt: test 8 ( 1024 byte blocks, 1024 bytes per update, 1 updates): 18759 cycles/operation, 18 cycle > > testing speed of async cmac(aes-generic) (cmac(aes-generic)) > > [ 97.837497] tcrypt: test 8 ( 1024 byte blocks, 1024 bytes per update, 1 updates): 31365 cycles/operation, 30 cycle So clearly aes-generic is slower than aes-aesni even with saving and restoring for each block. Therefore improving the performance of the latter per se does not make sense. Cheers, -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
