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 <toa...@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@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@router:~ # kldload aesni
> root@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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