diff options
| author | Andy Polyakov <appro@openssl.org> | 2017-07-20 09:48:35 +0200 |
|---|---|---|
| committer | Andy Polyakov <appro@openssl.org> | 2017-07-21 14:07:32 +0200 |
| commit | 64d92d74985ebb3d0be58a9718f9e080a14a8e7f (patch) | |
| tree | 036456c8d139587371300824d273d1c500411d1a /crypto/modes | |
| parent | bbb4ceb86eb6ea0300f744443c36fb6e980fff9d (diff) | |
| download | openssl-64d92d74985ebb3d0be58a9718f9e080a14a8e7f.tar.gz | |
x86_64 assembly pack: "optimize" for Knights Landing, add AVX-512 results.
"Optimize" is in quotes because it's rather a "salvage operation"
for now. Idea is to identify processor capability flags that
drive Knights Landing to suboptimial code paths and mask them.
Two flags were identified, XSAVE and ADCX/ADOX. Former affects
choice of AES-NI code path specific for Silvermont (Knights Landing
is of Silvermont "ancestry"). And 64-bit ADCX/ADOX instructions are
effectively mishandled at decode time. In both cases we are looking
at ~2x improvement.
AVX-512 results cover even Skylake-X :-)
Hardware used for benchmarking courtesy of Atos, experiments run by
Romain Dolbeau <romain.dolbeau@atos.net>. Kudos!
Reviewed-by: Rich Salz <rsalz@openssl.org>
Diffstat (limited to 'crypto/modes')
| -rw-r--r-- | crypto/modes/asm/aesni-gcm-x86_64.pl | 2 | ||||
| -rw-r--r-- | crypto/modes/asm/ghash-x86_64.pl | 3 |
2 files changed, 5 insertions, 0 deletions
diff --git a/crypto/modes/asm/aesni-gcm-x86_64.pl b/crypto/modes/asm/aesni-gcm-x86_64.pl index 3cd231e22f..b42016101e 100644 --- a/crypto/modes/asm/aesni-gcm-x86_64.pl +++ b/crypto/modes/asm/aesni-gcm-x86_64.pl @@ -35,6 +35,8 @@ # Applications using the EVP interface will observe a few percent # worse performance.] # +# Knights Landing processes 1 byte in 1.25 cycles (measured with EVP). +# # [1] http://rt.openssl.org/Ticket/Display.html?id=2900&user=guest&pass=guest # [2] http://www.intel.com/content/dam/www/public/us/en/documents/software-support/enabling-high-performance-gcm.pdf diff --git a/crypto/modes/asm/ghash-x86_64.pl b/crypto/modes/asm/ghash-x86_64.pl index 817f6e59a0..fa4c9063a2 100644 --- a/crypto/modes/asm/ghash-x86_64.pl +++ b/crypto/modes/asm/ghash-x86_64.pl @@ -74,6 +74,7 @@ # Skylake 0.44(+110%)(if system doesn't support AVX) # Bulldozer 1.49(+27%) # Silvermont 2.88(+13%) +# Knights L 2.12(-) (if system doesn't support AVX) # Goldmont 1.08(+24%) # March 2013 @@ -86,6 +87,8 @@ # it performs in 0.41 cycles per byte on Haswell processor, in # 0.29 on Broadwell, and in 0.36 on Skylake. # +# Knights Landing achieves 1.09 cpb. +# # [1] http://rt.openssl.org/Ticket/Display.html?id=2900&user=guest&pass=guest $flavour = shift; |