Atom C2758 - loading aesni(4) reduces performance

[Kevin Day]

root at router:/sys # freebsd-version
10.0-RELEASE-p7
root at router:/sys # openssl version
OpenSSL 1.0.1e-freebsd 11 Feb 2013

That’s what ships with 10.0. Trying your version (1.0.2a) seems worse for both, but still slower with aesni than without.

1.0.1e without aesni: aes-256-cbc     176609.34k   243517.86k   281851.62k   293480.37k   297345.02k
1.0.1e with aesni:    aes-256-cbc       4662.35k    17964.33k    59148.60k   145272.15k   208882.35k
1.0.2a without aesni: aes-256-cbc      34727.24k    38003.39k    38926.26k    39369.94k    39291.87k
1.0.2a with aesni:    aes-256-cbc       4585.40k    17842.11k    59530.18k   145439.74k   204827.31k



> On May 24, 2015, at 12:30 PM, Robert Simmons <rsimmons0 at gmail.com> wrote:
> 
> Can you provide the output of freebsd-version, and openssl version? It
> looks like you're using a very old version of OpenSSL. Here's my
> output as an example:
> 
> % freebsd-version
> 10.1-RELEASE-p10
> 
> % openssl version
> OpenSSL 1.0.1l-freebsd 15 Jan 2015
> 
> % /usr/local/bin/openssl version
> OpenSSL 1.0.2a 19 Mar 2015
> 
> On Sun, May 24, 2015 at 12:22 PM, Kevin Day <toasty at dragondata.com> wrote:
>> 
>> I’ve got an Atom C2758 system:
>> 
>> CPU: Intel(R) Atom(TM) CPU  C2758  @ 2.40GHz (2400.06-MHz K8-class CPU)
>>  Origin = "GenuineIntel"  Id = 0x406d8  Family = 0x6  Model = 0x4d  Stepping = 8
>>  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
>>  Features2=0x43d8e3bf<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,MOVBE,POPCNT,TSCDLT,AESNI,RDRAND>
>>  AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM>
>>  AMD Features2=0x101<LAHF,Prefetch>
>>  Standard Extended Features=0x2282<TSCADJ,SMEP,ENHMOVSB>
>> 
>> Enabling aesni seems to make performance much worse:
>> 
>> root at router:~ # openssl speed -evp aes-256-cbc -elapsed
>> You have chosen to measure elapsed time instead of user CPU time.
>> Doing aes-256-cbc for 3s on 16 size blocks: 33200486 aes-256-cbc's in 3.01s
>> Doing aes-256-cbc for 3s on 64 size blocks: 11444626 aes-256-cbc's in 3.01s
>> Doing aes-256-cbc for 3s on 256 size blocks: 3328753 aes-256-cbc's in 3.02s
>> Doing aes-256-cbc for 3s on 1024 size blocks: 866523 aes-256-cbc's in 3.02s
>> Doing aes-256-cbc for 3s on 8192 size blocks: 108891 aes-256-cbc's in 3.00s
>> OpenSSL 1.0.1e-freebsd 11 Feb 2013
>> built on: date not available
>> options:bn(64,64) rc4(16x,int) des(idx,cisc,16,int) aes(partial) idea(int) blowfish(idx)
>> compiler: cc
>> The 'numbers' are in 1000s of bytes per second processed.
>> type             16 bytes     64 bytes    256 bytes   1024 bytes   8192 bytes
>> aes-256-cbc     176609.34k   243517.86k   281851.62k   293480.37k   297345.02k
>> 
>> 
>> root at router:~ # kldload aesni
>> root at router:~ # openssl speed -evp aes-256-cbc -elapsed
>> You have chosen to measure elapsed time instead of user CPU time.
>> Doing aes-256-cbc for 3s on 16 size blocks: 881020 aes-256-cbc's in 3.02s
>> Doing aes-256-cbc for 3s on 64 size blocks: 842078 aes-256-cbc's in 3.00s
>> Doing aes-256-cbc for 3s on 256 size blocks: 700368 aes-256-cbc's in 3.03s
>> Doing aes-256-cbc for 3s on 1024 size blocks: 425602 aes-256-cbc's in 3.00s
>> Doing aes-256-cbc for 3s on 8192 size blocks: 76495 aes-256-cbc's in 3.00s
>> OpenSSL 1.0.1e-freebsd 11 Feb 2013
>> built on: date not available
>> options:bn(64,64) rc4(16x,int) des(idx,cisc,16,int) aes(partial) idea(int) blowfish(idx)
>> compiler: cc
>> The 'numbers' are in 1000s of bytes per second processed.
>> type             16 bytes     64 bytes    256 bytes   1024 bytes   8192 bytes
>> aes-256-cbc       4662.35k    17964.33k    59148.60k   145272.15k   208882.35k
>> 
>> 
>> Is this expected here, or is something broken?
>> 
>> — Kevin
>> 
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