Jussi Kivilinna
8435a3c300
crypto: twofish/avx - avoid using temporary stack buffers
...
Introduce new assembler functions to avoid use temporary stack buffers in glue
code. This also allows use of vector instructions for xoring output in CTR and
CBC modes and construction of IVs for CTR mode.
ECB mode sees ~0.2% decrease in speed because added one extra function
call. CBC mode decryption and CTR mode benefit from vector operations
and gain ~3%.
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2012-10-24 21:10:55 +08:00
Jussi Kivilinna
f94a73f8dd
crypto: twofish-avx - tune assembler code for more performance
...
Patch replaces 'movb' instructions with 'movzbl' to break false register
dependencies and interleaves instructions better for out-of-order scheduling.
Tested on Intel Core i5-2450M and AMD FX-8100.
tcrypt ECB results:
Intel Core i5-2450M:
size old-vs-new new-vs-3way old-vs-3way
enc dec enc dec enc dec
256 1.12x 1.13x 1.36x 1.37x 1.21x 1.22x
1k 1.14x 1.14x 1.48x 1.49x 1.29x 1.31x
8k 1.14x 1.14x 1.50x 1.52x 1.32x 1.33x
AMD FX-8100:
size old-vs-new new-vs-3way old-vs-3way
enc dec enc dec enc dec
256 1.10x 1.11x 1.01x 1.01x 0.92x 0.91x
1k 1.11x 1.12x 1.08x 1.07x 0.97x 0.96x
8k 1.11x 1.13x 1.10x 1.08x 0.99x 0.97x
[v2]
- Do instruction interleaving another way to avoid adding new FPU<=>CPU
register moves as these cause performance drop on Bulldozer.
- Further interleaving improvements for better out-of-order scheduling.
Tested-by: Borislav Petkov <bp@alien8.de>
Cc: Johannes Goetzfried <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2012-09-07 04:17:04 +08:00
Johannes Goetzfried
a43478863b
crypto: twofish-avx - remove useless instruction
...
The register %rdx is written, but never read till the end of the encryption
routine. Therefore let's delete the useless instruction.
Signed-off-by: Johannes Goetzfried <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2012-07-11 11:08:30 +08:00
Johannes Goetzfried
107778b592
crypto: twofish - add x86_64/avx assembler implementation
...
This patch adds a x86_64/avx assembler implementation of the Twofish block
cipher. The implementation processes eight blocks in parallel (two 4 block
chunk AVX operations). The table-lookups are done in general-purpose registers.
For small blocksizes the 3way-parallel functions from the twofish-x86_64-3way
module are called. A good performance increase is provided for blocksizes
greater or equal to 128B.
Patch has been tested with tcrypt and automated filesystem tests.
Tcrypt benchmark results:
Intel Core i5-2500 CPU (fam:6, model:42, step:7)
twofish-avx-x86_64 vs. twofish-x86_64-3way
128bit key: (lrw:256bit) (xts:256bit)
size ecb-enc ecb-dec cbc-enc cbc-dec ctr-enc ctr-dec lrw-enc lrw-dec xts-enc xts-dec
16B 0.96x 0.97x 1.00x 0.95x 0.97x 0.97x 0.96x 0.95x 0.95x 0.98x
64B 0.99x 0.99x 1.00x 0.99x 0.98x 0.98x 0.99x 0.98x 0.99x 0.98x
256B 1.20x 1.21x 1.00x 1.19x 1.15x 1.14x 1.19x 1.20x 1.18x 1.19x
1024B 1.29x 1.30x 1.00x 1.28x 1.23x 1.24x 1.26x 1.28x 1.26x 1.27x
8192B 1.31x 1.32x 1.00x 1.31x 1.25x 1.25x 1.28x 1.29x 1.28x 1.30x
256bit key: (lrw:384bit) (xts:512bit)
size ecb-enc ecb-dec cbc-enc cbc-dec ctr-enc ctr-dec lrw-enc lrw-dec xts-enc xts-dec
16B 0.96x 0.96x 1.00x 0.96x 0.97x 0.98x 0.95x 0.95x 0.95x 0.96x
64B 1.00x 0.99x 1.00x 0.98x 0.98x 1.01x 0.98x 0.98x 0.98x 0.98x
256B 1.20x 1.21x 1.00x 1.21x 1.15x 1.15x 1.19x 1.20x 1.18x 1.19x
1024B 1.29x 1.30x 1.00x 1.28x 1.23x 1.23x 1.26x 1.27x 1.26x 1.27x
8192B 1.31x 1.33x 1.00x 1.31x 1.26x 1.26x 1.29x 1.29x 1.28x 1.30x
twofish-avx-x86_64 vs aes-asm (8kB block):
128bit 256bit
ecb-enc 1.19x 1.63x
ecb-dec 1.18x 1.62x
cbc-enc 0.75x 1.03x
cbc-dec 1.23x 1.67x
ctr-enc 1.24x 1.65x
ctr-dec 1.24x 1.65x
lrw-enc 1.15x 1.53x
lrw-dec 1.14x 1.52x
xts-enc 1.16x 1.56x
xts-dec 1.16x 1.56x
Signed-off-by: Johannes Goetzfried <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2012-06-12 16:46:07 +08:00
