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Date: Sun, 24 May 2015 15:44:54 -0700
From: John-Mark Gurney <jmg@funkthat.com>
To: Kevin Day <toasty@dragondata.com>
Cc: freebsd-security@freebsd.org
Subject: Re: Atom C2758 - loading aesni(4) reduces performance
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Kevin Day wrote this message on Sun, May 24, 2015 at 11:22 -0500:
> 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?

If you have cryptodev loaded, this is to be expected as OpenSSL will
use /dev/crypto instead of the AES-NI instructions..  Just don't load
cryptodev and you'll be fine..

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."