RPi Performance

=CPU=

Linpack
The Arm has been tested using the linpack benchmark from, built with gcc with -O3 (Optimisation level 3). Run with array size 200.

With software floating point

Compile/Run
cc -O3 -o linpack linpack.c -lm linpack.c: In function ‘main’: linpack.c:69: warning: return type of ‘main’ is not ‘int’ ./linpack Enter array size (q to quit) [200]: 200

Results
Crippled Memory required: 315K.

LINPACK benchmark, Double precision. Machine precision: 15 digits. Array size 200 X 200. Average rolled and unrolled performance:

Reps Time(s) DGEFA  DGESL  OVERHEAD    KFLOPS 2  0.53  92.45%   1.89%   5.66%   5493.333       4   1.07  92.52%   2.80%   4.67%   5385.621       8   2.12  92.45%   2.36%   5.19%   5466.003      16   4.24  92.45%   2.83%   4.72%   5438.944      32   8.49  92.11%   2.71%   5.18%   5459.213      64  16.98  92.05%   2.89%   5.06%   5452.440

Hardware floating point (-mfloat-abi=softfp) Memory required: 315K. LINPACK benchmark, Double precision. Machine precision: 15 digits. Array size 200 X 200. Average rolled and unrolled performance:

Reps Time(s) DGEFA  DGESL  OVERHEAD    KFLOPS 8  0.51  90.20%   3.92%   5.88%  22888.889      16   1.02  89.22%   4.90%   5.88%  22888.889      32   2.05  90.24%   3.41%   6.34%  22888.889      64   4.08  91.42%   2.94%   5.64%  22829.437     128   8.16  91.54%   2.94%   5.51%  22799.827     256  16.31  91.35%   2.76%   5.89%  22903.800

Full hardware floating point on Raspbian (-mfloat-abi=hard -mfpu=vfp) and arm_freq=700 Memory required: 315K. LINPACK benchmark, Double precision. Machine precision: 15 digits. Array size 200 X 200. Average rolled and unrolled performance:

Reps Time(s) DGEFA  DGESL  OVERHEAD    KFLOPS 16  0.58  89.66%   3.45%   6.90%  40691.358      32   1.17  87.18%   4.27%   8.55%  41071.651      64   2.32  88.36%   3.02%   8.62%  41459.119     128   4.67  88.22%   3.43%   8.35%  41071.651     256   9.33  88.85%   3.32%   7.82%  40880.620     512  18.63  89.00%   2.95%   8.05%  41047.675

Full hardware floating point on Raspbian (-mfloat-abi=hard -mfpu=vfp) and arm_freq=1000 and core_freq=500 Memory required: 315K. LINPACK benchmark, Double precision. Machine precision: 15 digits. Array size 200 X 200. Average rolled and unrolled performance:

Reps Time(s) DGEFA  DGESL  OVERHEAD    KFLOPS 32  0.79  89.87%   0.00%  10.13%  61896.714      64   1.58  89.24%   1.27%   9.49%  61463.869     128   3.16  90.19%   1.90%   7.91%  60407.789     256   6.32  88.13%   3.80%   8.07%  60511.761     512  12.65  87.83%   3.56%   8.62%  60825.836

Whetstone/Dhrystone
All code compiled with gcc options -float-abi=softfp -O3

Source
Code for these tests can be found here http://www.rowley.co.uk/arm/whet_dhry.zip. Or if 404 this code might be analogous http://freespace.virgin.net/roy.longbottom/benchnt.zip

Compile/Run
?

Results
Dhrystone Microseconds for one run through Dhrystone: 1.2

Dhrystones per Second: 809061.5

Whetstone Crippled Loops: 1000, Iterations: 10, Duration: 24 sec.

C Converted Double Precision Whetstones: 41.7 MIPS

Rebuilding the Whetstone test code with 'gcc -mfpu -float-abi=softfp' gives better results:

Loops: 1000, Iterations: 100, Duration: 106 sec. C Converted Double Precision Whetstones: 94.3 MIPS

However, the majority of compute time is spent in the SQRT function, which for the above test was built without -mfpu=vfp. Using a library with vfp give the following much improved result : Loops: 1000, Iterations: 100, Duration: 15 sec. C Converted Double Precision Whetstones: 666.7 MIPS

Compile/Run
openssl version; openssl speed;

Results
OpenSSL 0.9.8o 01 Jun 2010 built on: Thu Aug 26 18:56:26 UTC 2010 options:bn(64,32) md2(int) rc4(ptr,int) des(idx,risc1,4,long) aes(partial) blowfish(idx) compiler: gcc -fPIC -DOPENSSL_PIC -DZLIB -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -DL_ENDIAN -DTERMIO -O2 -Wa,--noexecstack -g -Wall available timing options: TIMES TIMEB HZ=100 [sysconf value] timing function used: times The 'numbers' are in 1000s of bytes per second processed. type            16 bytes     64 bytes    256 bytes   1024 bytes   8192 bytes md2               148.81k      372.18k      624.81k      769.95k      832.90k mdc2                0.00         0.00         0.00         0.00         0.00 md4               615.30k     2468.76k     7612.19k    16707.01k    28104.86k md5               380.13k     1501.12k     4800.77k    11312.81k    21682.77k hmac(md5)        1022.28k     3480.23k     9587.80k    17492.25k    25441.78k sha1              303.72k     1092.39k     3106.50k     6302.57k     9852.39k rmd160            244.29k      849.04k     2414.53k     4747.26k     7513.00k rc4             14658.70k    16836.49k    17462.03k    17628.21k    17522.08k des cbc          2913.17k     3221.30k     3289.77k     3360.09k     3367.21k des ede3         1149.87k     1188.59k     1198.46k     1206.00k     1208.25k idea cbc            0.00         0.00         0.00         0.00         0.00 seed cbc            0.00         0.00         0.00         0.00         0.00 rc2 cbc          2812.71k     3012.02k     3054.19k     3077.82k     3076.12k rc5-32/12 cbc       0.00         0.00         0.00         0.00         0.00 blowfish cbc     6091.32k     7007.89k     7250.62k     7288.21k     7163.88k cast cbc         5068.25k     6020.03k     6345.71k     6367.64k     6260.44k aes-128 cbc      3205.76k     3497.72k     3616.00k     3652.49k     3665.85k aes-192 cbc      2730.65k     2981.88k     3073.20k     3102.38k     3111.86k aes-256 cbc      2383.90k     2596.12k     2659.91k     2702.13k     2732.50k camellia-128 cbc    0.00         0.00         0.00         0.00         0.00 camellia-192 cbc    0.00         0.00         0.00         0.00         0.00 camellia-256 cbc    0.00         0.00         0.00         0.00         0.00 sha256            679.98k     1629.47k     2905.43k     3708.32k     4175.45k sha512             41.02k      163.83k      232.63k      318.20k      353.81k aes-128 ige      3089.03k     3579.08k     3698.68k     3689.14k     3578.18k aes-192 ige      2641.68k     3019.45k     3111.38k     3144.95k     3035.70k aes-256 ige      2334.50k     2632.35k     2705.04k     2735.69k     2687.74k sign   verify    sign/s verify/s rsa 512 bits 0.013747s 0.001193s     72.7    838.4 rsa 1024 bits 0.063481s 0.002742s    15.8    364.7 rsa 2048 bits 0.321250s 0.007378s     3.1    135.5 rsa 4096 bits 1.805000s 0.022528s     0.6     44.4 sign   verify    sign/s verify/s dsa 512 bits 0.011690s 0.013597s     85.5     73.5 dsa 1024 bits 0.027233s 0.031683s    36.7     31.6 dsa 2048 bits 0.073897s 0.087304s    13.5     11.5

=GPU= The RaspberryPi appears to handle h264 1080p movie from USB to HDMI at least 4MB/s.

The Admin "JamesH" said it would handle "basically 1080p30, high profile, >40Mb/s." (5MB/s) in h264

And about WVGA(480p30) or 720p20 in VP8/WEBM

Source
https://github.com/raspberrypi/quake3

Compile/Run
- Download source, compile as delivered - Start game - Runs at display's native res, in my case 1280x1024 - Bitdepth stuck at 16bpp, not sure how to change, values in q3config.cfg seem to be ignored - In-game console commands: \timedemo 1 \demo four

Results
armel "driver info" : http://i.imgur.com/wtYhB.jpg armel timedemo score: http://i.imgur.com/i2TkN.jpg 20.2fps

armhf "driver info" : http://i.imgur.com/8nqa1.jpg armhf timedemo score: http://i.imgur.com/dUu0g.jpg 28.5fps

=IO=

USB bus
root@raspberrypi:~# dd if=/dev/sda of=/dev/null bs=32M count=10 iflag=direct 10+0 records in 10+0 records out 335544320 bytes (336 MB) copied, 10.6428 s, 31.5 MB/s
 * All IO uses the same bus so the combination of all IO can not exceed the the bus speed of an as yet hypothetical 60MB/s
 * A test with a fast USB-Stick showed that Raspberry Pi can achieve about 30 MB/s:

SD card

 * TODO test

'''Note: the dd test should probably use i/oflags=direct for reads and writes. But that will change the results recorded to date'''

Compile/Run
dd if=/dev/zero of=~/test.tmp bs=500K count=1024 dd if=~/test.tmp of=/dev/null bs=500K count=1024 rm ~/test.tmp uname -a
 * 1) write
 * 1) read
 * 1) cleanup
 * 1) find out which kernel you're running

Results

 * Depends on SD card used http://elinux.org/RaspberryPiBoardVerifiedPeripherals#SD_cards

Compile/Run
On LAN server: iperf -s

On Raspberry Pi: iperf -t 60 -c  -d

Additional Observations
Using netperf -H [netserver host IP] with Debian Wheezy and changing the CPU clock rate, the TCP performance increased linearly from 61 Mb/s at 500 MHz to 80.6 Mb/s at 900 MHz.

Performance seems to improve considerably by dropping MTU from the default 1500 to 1488. However, this has caused kernel instabilities with Debian Squeeze images (debian6-19-04-2012). It is unknown if this performance benefit is also gained on other images, or if these kernel instabilities have been resolved.

=Power=

This table lists how much power is drawn over the 5V power cable whilst performing various tasks.