[SOLVED] LE8 OpenVPN throughput is only half of Armbian

fxfxfx · April 24, 2017 at 8:23 AM

I am seeing quite a noticeable performance variation between LE and Armbian on the same Amlogic S905 box for encryption and decryption use in OpenVPN, which should be relevant to all of us running Kodi with a VPN connection, using Zomboided, for instance.

LibreElec seems to deliver roughly half the throughput when compared to an Armbian install on the same hardware (NexBox A95X with a S905 AmLogic chipset - the non-X version).

Here are the stats:

LibreElec 8.0.1h-temp_sensor_disabled

Kodi:~ # openssl speed -evp aes-128-cbc
Doing aes-128-cbc for 3s on 16 size blocks: 4558454 aes-128-cbc's in 3.00s
Doing aes-128-cbc for 3s on 64 size blocks: 1290974 aes-128-cbc's in 3.00s
Doing aes-128-cbc for 3s on 256 size blocks: 334686 aes-128-cbc's in 3.00s
Doing aes-128-cbc for 3s on 1024 size blocks: 84452 aes-128-cbc's in 3.00s
Doing aes-128-cbc for 3s on 8192 size blocks: 10585 aes-128-cbc's in 3.00s
LibreSSL 2.4.4
built on: date not available
options:bn(64,32) rc4(ptr,int) des(idx,cisc,16,long) aes(partial) idea(int) blowfish(idx)
compiler: information not available
The 'numbers' are in 1000s of bytes per second processed.
type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes
aes-128-cbc 24311.75k 27540.78k 28559.87k 28826.28k 28904.11

Average throughput is ~27628 for LibreElec

Balbes ARMBIAN 5.27 stable Ubuntu 16.04.2 LTS 3.14.29 (headless server build):

kodi@amlogic-s905x:~$ openssl speed -evp aes-128-cbc
Doing aes-128-cbc for 3s on 16 size blocks: 8416879 aes-128-cbc's in 3.00s
Doing aes-128-cbc for 3s on 64 size blocks: 2436154 aes-128-cbc's in 3.00s
Doing aes-128-cbc for 3s on 256 size blocks: 637152 aes-128-cbc's in 3.00s
Doing aes-128-cbc for 3s on 1024 size blocks: 161162 aes-128-cbc's in 3.00s
Doing aes-128-cbc for 3s on 8192 size blocks: 20208 aes-128-cbc's in 3.00s
OpenSSL 1.0.2g 1 Mar 2016
built on: reproducible build, date unspecified
options:bn(64,64) rc4(ptr,char) des(idx,cisc,16,int) aes(partial) blowfish(ptr)
compiler: cc -I. -I.. -I../include -fPIC -DOPENSSL_PIC -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -DL_ENDIAN -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -Wl,-Bsymbolic-functions -Wl,-z,relro -Wa,--noexecstack -Wall -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM
The 'numbers' are in 1000s of bytes per second processed.
type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes
aes-128-cbc 44890.02k 51971.29k 54370.30k 55009.96k 55181.31k

Average throughput is ~52284 for Armbian.

Therefore it seems that LibreElec is only offering ~53% of the OpenVPN throughput performance compared to the same hardware running Armbian. Why is that?

And can this be used in our favor / utilized in future LE8 versions for the S905/X Amlogic boxes? In other words; are there any low-hanging fruits in terms of possible optimizations for encryption and decryption speed on LE8 in the future for the AmLogic boxes we use and grind on a daily basis?

**kszaq** · April 24, 2017 at 8:53 AM

Lower performance is because LE using LibreSSL instead of OpenSSL. LibreSSL is slower as it doesn't include any target-specific assembly code.

Things will change in LE9 as it switches back to OpenSSL.

fxfxfx · April 24, 2017 at 11:08 AM

Quote from kszaq

Things will change in LE9 as it switches back to OpenSSL.

Thanks for the explanation and quick update.

fxfxfx · June 4, 2017 at 8:30 PM

Just a quick update for those with special interest in OpenVPN performance on the Amlogic boxes. I tried installing the May 31st Debian Jessie release from Balbes and got even more impressive results on my Nexbox A95X S905 (non-X):

frank@amlogic:~$ openssl speed -evp aes-128-cbc
Doing aes-128-cbc for 3s on 16 size blocks: 9027426 aes-128-cbc's in 3.00s
Doing aes-128-cbc for 3s on 64 size blocks: 2822472 aes-128-cbc's in 3.00s
Doing aes-128-cbc for 3s on 256 size blocks: 757706 aes-128-cbc's in 3.00s
Doing aes-128-cbc for 3s on 1024 size blocks: 192997 aes-128-cbc's in 3.00s
Doing aes-128-cbc for 3s on 8192 size blocks: 24256 aes-128-cbc's in 2.99s
OpenSSL 1.0.1t 3 May 2016
built on: Fri Jan 27 00:08:40 2017
options:bn(64,64) rc4(ptr,char) des(idx,cisc,16,int) aes(partial) blowfish(ptr)
compiler: gcc -I. -I.. -I../include -fPIC -DOPENSSL_PIC -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -DL_ENDIAN -DTERMIO -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -Wl,-z,relro -Wa,--noexecstack -Wall
The 'numbers' are in 1000s of bytes per second processed.
type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes
aes-128-cbc 48146.27k 60212.74k 64657.58k 65876.31k 66456.57k

Average throughput is ~61070 for Armbian (Jessie).

Only puzzling thing is the apparent version downgrade of OpenSSL from 1.0.2g dated March 1st 2016 to OpenSSL version 1.0.1t, which strangely has a newer date of May 3rd 2016, to make it even more confusing. Anyways, throughput performance is up ~17%.

**kszaq** · June 4, 2017 at 10:21 PM

S905X has crypto extensions which makes AES even faster:

Code

LibreELEC:~ # openssl speed -evp aes-128-cbc
Doing aes-128-cbc for 3s on 16 size blocks: 26915658 aes-128-cbc's in 3.00s
Doing aes-128-cbc for 3s on 64 size blocks: 19345610 aes-128-cbc's in 3.00s
Doing aes-128-cbc for 3s on 256 size blocks: 8833813 aes-128-cbc's in 2.99s
Doing aes-128-cbc for 3s on 1024 size blocks: 2849821 aes-128-cbc's in 3.00s
Doing aes-128-cbc for 3s on 8192 size blocks: 389168 aes-128-cbc's in 2.99s
OpenSSL 1.0.2k  26 Jan 2017
built on: reproducible build, date unspecified
options:bn(64,32) rc4(ptr,char) des(idx,cisc,16,long) aes(partial) idea(int) blowfish(ptr)
compiler: /home/kszaq/ocz/le-master/build.LibreELEC-S905.arm-8.0-devel/toolchain/bin/armv8a-libreelec-linux-gnueabi-gcc -I. -I.. -I../include  -fPIC -DOPENSSL_PIC -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -march=armv8-a+crc -mabi=aapcs-linux -Wno-psabi -Wa,-mno-warn-deprecated -mcpu=cortex-a53 -mfloat-abi=hard -mfpu=neon-fp-armv8 -fomit-frame-pointer -Wall -pipe -Os -flto -ffat-lto-objects -march=armv8-a+crc -mtune=cortex-a53 -fuse-ld=gold -fuse-linker-plugin -flto -O3 -Wall -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DAES_ASM -DBSAES_ASM -DGHASH_ASM
The 'numbers' are in 1000s of bytes per second processed.
type             16 bytes     64 bytes    256 bytes   1024 bytes   8192 bytes
aes-128-cbc     143550.18k   412706.35k   756339.84k   972738.90k  1066242.23k

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fxfxfx · June 5, 2017 at 8:12 PM

Quote from kszaq

S905X has crypto extensions which makes AES even faster:

Code

LibreELEC:~ # openssl speed -evp aes-128-cbc
...
The 'numbers' are in 1000s of bytes per second processed.
type             16 bytes     64 bytes    256 bytes   1024 bytes   8192 bytes
aes-128-cbc     143550.18k   412706.35k   756339.84k   972738.90k  1066242.23k

Thanks. I have access to three S905X boxes, but never tested them as OpenVPN servers, as I 'knew' that the CPU of the S905 was somewhat more powerful than the S905X, and assumed S905 superiority in OpenVPN server use because of it. But having added crypto extensions in the S905X changes the game in my specific use case scenario.

I will have to replace my current OpenVPN server (S905 box) with a crypographically beefier S905X replacement.

Very useful info, indeed. Thanks again.

fxfxfx · June 7, 2017 at 10:04 PM

I have failed to replicate your performance results for S905X boxes running LE 8.0.2a, since that version is still running LibreSSL 2.4.4. Are you running a dev build/LE9 version/modded LE8? I see that you have OpenSSL 1.0.2k, rather than LibreSSL - intriguing, as I thought that was LE9 only

My LibreSSL test on a S905X 2G/8G box running LE 8.0.2a:

Kodi:~ # openssl speed -evp aes-128-cbc
Doing aes-128-cbc for 3s on 16 size blocks: 4552103 aes-128-cbc's in 3.00s
Doing aes-128-cbc for 3s on 64 size blocks: 1283597 aes-128-cbc's in 2.98s
Doing aes-128-cbc for 3s on 256 size blocks: 333310 aes-128-cbc's in 2.99s
Doing aes-128-cbc for 3s on 1024 size blocks: 84084 aes-128-cbc's in 2.99s
Doing aes-128-cbc for 3s on 8192 size blocks: 10522 aes-128-cbc's in 2.98s
LibreSSL 2.4.4
built on: date not available
options:bn(64,32) rc4(ptr,int) des(idx,cisc,16,long) aes(partial) idea(int) blowfish(idx)
compiler: information not available

The 'numbers' are in 1000s of bytes per second processed.
type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes
aes-128-cbc 24277.88k 27567.18k 28537.58k 28796.66k 28924.91k

**kszaq** · June 8, 2017 at 6:54 AM

I will switch to OpenSSL in my next build. Thanks to escalade I was able to do this while keeping compatibility with addons that are linked to LibreSSL.

fxfxfx · June 8, 2017 at 4:24 PM

Quote from kszaq

I will switch to OpenSSL in my next build. Thanks to escalade I was able to do this while keeping compatibility with addons that are linked to LibreSSL.

Exciting news. Looking forward to next build.

fxfxfx · June 19, 2017 at 6:57 PM

Tried and tested on S905 and S905X. So far, I cannot achieve the ~100.000k+ performance seen above on a S905X. The S905 and S905X achieve identical performance on my boxes, around 66.000+ max. But a definite improvement in performance compared to LibreSSL and now comparable to Debian on S905/S905X.

Ok, so an score update for the interested, based on LE 8.0.2b / OpenSSL:

S905X (2G/16G)

LibreELEC (community) Version: 8.0.2b-temp_sensor_disabled
LibreELEC git: 41cba91834574a1e3388dcfca8d3444c78d61287

S905X:~ # openssl speed -evp aes-128-cbc
OpenSSL 1.0.2l 25 May 2017

options:bn(64,32) rc4(ptr,char) des(idx,cisc,16,long) aes(partial) idea(int) blowfish(ptr)
compiler: /home/kszaq/ocz/le-master/build.LibreELEC-S905.arm-8.0-devel/toolchain/bin/armv8a-libreelec-linux-gnueabi-gcc -I. -I.. -I../include -fPIC -DOPENSSL_PIC -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -march=armv8-a+crc -mabi=aapcs-linux -Wno-psabi -Wa,-mno-warn-deprecated -mcpu=cortex-a53 -mfloat-abi=hard -mfpu=neon-fp-armv8 -fomit-frame-pointer -Wall -pipe -Os -flto -ffat-lto-objects -march=armv8-a+crc -mtune=cortex-a53 -fuse-ld=gold -fuse-linker-plugin -flto -O3 -Wall -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DAES_ASM -DBSAES_ASM -DGHASH_ASM

The 'numbers' are in 1000s of bytes per second processed.
type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes
aes-128-cbc 52439.59k 61217.63k 65165.40k 66189.92k 66688.95k

VERSUS

S905 (1G/8G)

LibreELEC (community) Version: 8.0.2b-temp_sensor_disabled
LibreELEC git: 41cba91834574a1e3388dcfca8d3444c78d61287
S905:~ # openssl speed -evp aes-128-cbc
OpenSSL 1.0.2l 25 May 2017
options:bn(64,32) rc4(ptr,char) des(idx,cisc,16,long) aes(partial) idea(int) blowfish(ptr)
compiler: /home/kszaq/ocz/le-master/build.LibreELEC-S905.arm-8.0-devel/toolchain/bin/armv8a-libreelec-linux-gnueabi-gcc -I. -I.. -I../include -fPIC -DOPENSSL_PIC -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -march=armv8-a+crc -mabi=aapcs-linux -Wno-psabi -Wa,-mno-warn-deprecated -mcpu=cortex-a53 -mfloat-abi=hard -mfpu=neon-fp-armv8 -fomit-frame-pointer -Wall -pipe -Os -flto -ffat-lto-objects -march=armv8-a+crc -mtune=cortex-a53 -fuse-ld=gold -fuse-linker-plugin -flto -O3 -Wall -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DAES_ASM -DBSAES_ASM -DGHASH_ASM

The 'numbers' are in 1000s of bytes per second processed.
type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes
aes-128-cbc 52157.89k 61173.33k 65310.31k 66193.07k 66719.59k

**kszaq** · June 19, 2017 at 8:02 PM

Can you post cpuinfo from your S905X box?

Jaaxx · June 19, 2017 at 8:43 PM

That's odd. Here's my results on s905x -

type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes

aes-128-cbc 142601.09k 401685.67k 728886.88k 929721.00k 1011881.30k

Edit: This is on 8.0.2b

fxfxfx · June 19, 2017 at 9:42 PM

Thanks, kszag. A simple 'less /proc/cpuinfo' found the cause. The 'S905X box' I used for testing actually turns out to be an S905:

Processor : AArch64 Processor rev 4 (aarch64)
processor : 0
processor : 1
processor : 2
processor : 3
Features : fp asimd evtstrm crc32 wp half thumb fastmult vfp edsp neon vf pv3 tlsi vfpv4 idiva idivt
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4
Hardware : Amlogic
Serial : 1f0c13003209a3a13e932786eb086f51
Revision : 020c

I will dig out the two remaining S905X boxes and check if they are indeed S905X or not. And thanks, Jaaxx, for confirming the 100.000k+ performance on your end. I need the S905X's extra crypto performance and will bring in a new - and true S905X - box, if needed.

Edit: Also verified with this...

S905X:~ # fw_printenv

[...]
hostname=arm_gxbb

[...]

fxfxfx · July 9, 2017 at 9:01 AM

OK, so I thought it relevant to get around to posting an update.

Running a 2G/8G S905X box now (Nexbox A95X) on LE 8.0.2e:

Kodi:~ # less /proc/cpuinfo

Processor : AArch64 Processor rev 4 (aarch64)
Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 wp half thumb fastmult vfp edsp neon vfpv3 tlsi vfpv4 idiva idivt
Hardware : Amlogic
Revision : 020a

S905X:~ # fw_printenv

[...]

aml_dt=gxl_p212_2g
[...]

And here are the performance benchmarks for the box:

Kodi:~ # openssl speed -evp aes-128-cbc
Doing aes-128-cbc for 3s on 16 size blocks: 22739647 aes-128-cbc's in 2.98s
Doing aes-128-cbc for 3s on 64 size blocks: 15875682 aes-128-cbc's in 2.99s
Doing aes-128-cbc for 3s on 256 size blocks: 7178216 aes-128-cbc's in 3.00s
Doing aes-128-cbc for 3s on 1024 size blocks: 2298816 aes-128-cbc's in 2.99s
Doing aes-128-cbc for 3s on 8192 size blocks: 313328 aes-128-cbc's in 2.99s
OpenSSL 1.0.2l 25 May 2017
The 'numbers' are in 1000s of bytes per second processed.
type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes
aes-128-cbc 122092.06k 339813.93k 612541.10k 787286.82k 858455.84k

So, still not a 100K+ score for 8192 bytes, as kszaq and Jaaxx, which is a bit odd and unexpected, I guess, but an absolutely acceptable performance with more than 300% throughput increase over the 8.0.1h on a 1G/8G S905 (non-X).

EDIT:

The S905 (non-X) on 8.0.2e is closing the gap to S905X crypto performance, for those interested in a comparison:

amlogic:~$ openssl speed -evp aes-128-cbc
OpenSSL 1.1.0f 25 May 2017
The 'numbers' are in 1000s of bytes per second processed.

type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes 16384 bytes
aes-128-cbc 43428.43k 61313.79k 68540.84k 70619.48k 71245.82k 71286.78k