Difference between revisions of "RPi Performance"
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|SanDisk Ultra SDHC 4GB class 4 ||4.7 ||4.4 ||Raspbian Wheezy || Linux raspberry-pi 3.1.9+ #1 PREEMPT Wed Jun 6 16:26:14 CEST 2012 armv6l GNU/Linux || man:0x000003 oem:0x5344 name:SD04G hwrev:0x8 fwrev:0x0 || | |SanDisk Ultra SDHC 4GB class 4 ||4.7 ||4.4 ||Raspbian Wheezy || Linux raspberry-pi 3.1.9+ #1 PREEMPT Wed Jun 6 16:26:14 CEST 2012 armv6l GNU/Linux || man:0x000003 oem:0x5344 name:SD04G hwrev:0x8 fwrev:0x0 || | ||
+ | |- | ||
+ | |SanDisk SDHC 8GB class 4 ||11.1 ||5.6 ||Raspbian Wheezy || Linux raspberrypi 3.1.9+ #202 PREEMPT || After Hexxeh rpi-update. <br />man:0x000003 oem:0x5344 name:SD08G hwrev:0x8 fwrev:0x0 | ||
+ | |- | ||
|- | |- | ||
|SanDisk SDHC 8GB class 4 ||4.7 ||3.2 ||Debian Squeeze || || | |SanDisk SDHC 8GB class 4 ||4.7 ||3.2 ||Debian Squeeze || || |
Revision as of 12:30, 28 July 2012
Back to the Hub.
Software & Distributions:
Software - an overview.
Distributions - operating systems and development environments for the Raspberry Pi.
Kernel Compilation - advice on compiling a kernel.
Performance - measures of the Raspberry Pi's performance.
Programming - programming languages that might be used on the Raspberry Pi.
CPU
Linpack
The Arm has been tested using the linpack benchmark from [1], built with gcc with -O3 (Optimisation level 3). Run with array size 200.
With software floating point
Source
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
OpenSSL
Source
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
ioquake3
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
- 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:
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
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
# write dd if=/dev/zero of=~/test.tmp bs=500K count=1024 # read dd if=~/test.tmp of=/dev/null bs=500K count=1024 # cleanup rm ~/test.tmp # find out which kernel you're running uname -a
Results
- Depends on SD card used http://elinux.org/RaspberryPiBoardVerifiedPeripherals#SD_cards
SD Card | Read (MB/s) | Write (MB/s) | Distro | Kernel | Notes | |
---|---|---|---|---|---|---|
ADATA 32GB SDHC Class 10 (ASDH32GCL10-R) | 20.1 | 6.4 | 2012-06-18-wheezy-beta | Linux raspberrypi 3.1.9+ #152 PREEMPT Fri Jul 6 18:47:16 BST 2012 armv6l GNU/Linux | ||
Extrememory SDHC 16GB class 10 | 4.7 | 4.5 | Debian Wheezy "Raspbian" | Linux raspbian 3.1.9+ #52 | ||
Extrememory SDHC 16GB class 10 | 11.3 | 5.4 | Debian Wheezy "Raspbian" | Linux raspbian 3.1.9+ #101 | init_emmc_clock=200000000 in config.txt | |
Extrememory SDHC 16GB class 10 | 18.2 | 6.3 | Debian Wheezy "Raspbian" | Linux raspbian 3.1.9+ custom | kernel and firmware as of 17.06.2012, no extra option in config.txt | |
Extrememory SDHC 16GB class 10 (man:0x000012 oem:0x3456 name:F0F0F hwrev:0x1 fwrev:0x0) |
16.9 | 10.7 | archlinuxarm-13-06-2012 | Linux alarmpi 3.1.9-25-ARCH+ #1 PREEMPT | ||
Extrememory SDHC 32GB class 10 (man:0x000003 oem:0x5344 name:SMI hwrev:0x1 fwrev:0x0) |
18.7 | 16.5 | archlinuxarm-13-06-2012 | Linux alarmpi 3.1.9-25-ARCH+ #1 PREEMPT | ||
Fugi SDHC 32GB class 10 (P10NM00580A) | 12.7 | 19.8 | Debian Wheezy Raspbian | Linux raspbian 3.1.9+ #168 | man:0x000073 oem:0x4247 name:NCard hwrev:0x1 fwrev:0x0 | |
Integral SDHC 16GB class 10 | 17.7 | 19.6 | Debian Wheezy Raspbian | Linux raspbian 3.1.9+ #168 | ||
Kingston SDHC 4GB class 4 | 4.5 | 4.1 | Debian Squeeze "debian6-19-04-2012" | Linux raspberrypi 3.1.9+ #52 Tue May 8 23:49:32 BST 2012 | ||
Kingston SDHC 4GB class 4 | 4.2 | 2.5 | archlinuxarm-19-04-2012 | Linux alarmpi 3.1.9-13+ #6 Thu May 10 00:48:37 UTC 2012 | Identical card to one above. One to look into, as I was expecting Arch to be faster... | |
Kingston uSDHC 4GB class 4 | 4.0 | 3.8 | Debian Squeeze | Linux 3.1.9+ #90 | ||
Kingston uSDHC 8GB class 4 (SDC4/8GB) | 4.7 | 3.7 | archlinuxarm-29-04-2012 | Linux alarmpi 3.1.9+ #66 Thu May 17 16:56:20 BST 2012 | CrystalDiskMark results (FAT32) This is my only card that can be counted on to boot up on each plug-in. | |
Kingston SDHC 8GB class 4 (SD4/8GB) | 4.6 | 3.0 | archlinuxarm-29-04-2012 | Linux alarmpi 3.1.9+ #66 Thu May 17 16:56:20 BST 2012 | CrystalDiskMark results (FAT32) | |
Kingston SDHC 32GB class 10 | 10.8 | 8.1 | Fedora 17 ARM snapshot 07 May 2012 | Linux fedora-arm 3.1.9 #1 | mmc0: note - long write sync 1453000ns - 14608 its. - kernel/module problems? | |
Kingston SDHC 32GB class 10 | 4.7 | 4.1 | Fedora 17 ARM nightly snapshot | Linux fedora-arm 3.1.9+ #101 PREEMPT Mon Jun 4 17:19:44 BST 2012 | custom kernel from raspberrypi github - no more mmc0 sync problems | |
Kingston SDHC 32GB class 10 | 4.6 | 3.5 | Debian Squeeze "debian6-19-04-2012" | Linux raspberrypi 3.1.9+ #90 | ||
Panasonic SDHC 8GB class 6 | 4.8 | 4.4 | ||||
Panasonic SDHC 8GB class 4 | 11.1 | 9.7 | Debian Wheezy "Rasbpian" | Linux rpi 3.1.9+ #168 PREEMPT Sat Jul 14 18:56:31 BST 2012 armv6l GNU/Linux | ||
Patriot microSDHC 16GB Class 10 (PSF16GMSHC10) | 9.5 | 5.2 | Fedora 14 | Linux raspi 3.1.9+ #101 | init_emmc_clock=200000000 in config.txt | |
Samsung SDHC 16GB Class 10 (MB-SPAGA) | 10.7 | 8.8 | Fedora 17 ARM snapshot 07 May 2012 - GUI release | Linux fedora-arm 3.1.9 #1 | Had "long write sync" errors, slow boot times and then system instability using USB port on Macbook, switched to iPhone charger (5V 1A) and warning disappeared | |
Samsung SDHC 16GB Class 10 (MB-SPAGA) | 19.6 | 18.7 | Debian Wheezy "Raspbian" | Linux raspberrypi 3.1.9+ #168 PREEMPT Sat Jul 14 18:56:31 BST 2012 armvl GNU/Linux | (Same user / card as above, definitely notable that Raspbian is superior) | |
Samsung microSDHC 16GB Class 10 (MB-MPAGA/US) | 19.8 | 15.8 | Debian Wheezy "Raspbian" | Linux pisces 3.1.9+ #155 PREEMPT Mon Jul 9 12:49:19 BST 2012 armv6l GNU/Linux | - | |
Samsung microSDHC 16GB Class 4 (MB-MS4GA/US) | 19.2 | 5.5 | Debian Wheezy "Raspbian" | ? | - | |
SanDisk microSD 2GB | 4.7 | 4.2 | archlinuxarm-29-04-2012 | Linux alarmpi 3.1.9+ #66 Thu May 17 16:56:20 BST 2012 | CrystalDiskMark results (FAT32) Card has no serial/is likely a fake. | |
SanDisk Ultra SDHC 4GB class 4 | 4.7 | 4.4 | Raspbian Wheezy | Linux raspberry-pi 3.1.9+ #1 PREEMPT Wed Jun 6 16:26:14 CEST 2012 armv6l GNU/Linux | man:0x000003 oem:0x5344 name:SD04G hwrev:0x8 fwrev:0x0 | |
SanDisk SDHC 8GB class 4 | 11.1 | 5.6 | Raspbian Wheezy | Linux raspberrypi 3.1.9+ #202 PREEMPT | After Hexxeh rpi-update. man:0x000003 oem:0x5344 name:SD08G hwrev:0x8 fwrev:0x0 | |
SanDisk SDHC 8GB class 4 | 4.7 | 3.2 | Debian Squeeze | |||
SanDisk Ultra SDHC I 8GB class 6 "30MB/s*" | 19.5 | 7.6 | archlinuxarm | 3.1.9-22-ARCH+ #1 PREEMPT Sun Jun 17 13:54:30 UTC 2012 | "mmc0: error -84 whilst initialising SD card" at bootup, but works fine | |
SanDisk Ultra SDHC I 8GB class 10 "30MB/s*" | 19.3 | 3.2 | Raspbian Wheezy | 3.1.9+ #168 PREEMPT Sat Jul 14 18:56:31 BST 2012 | ||
SanDisk Ultra SDHC II 16GB class 2 "15MB/s*" | 16.7 | 16.2 | Raspbian Wheezy | 3.1.9+ #168 PREEMPT Sat Jul 14 18:56:31 BST 2012 | man:0x000003 oem:0x5344 name:SD16G hwrev:0x8 fwrev:0x0 | |
SanDisk Extreme SDHC I 8GB class 10 "30MB/s" | 17.7 | 19.7 | Archlinuxarm 2012-06-13 | Linux raspi 3.1.9-28-ARCH+ #1 PREEMPT Fri Jul 6 23:07:26 UTC 2012 armv6l GNU/Linux | ||
SanDisk SDHC 32GB class 6 | 4.6 | 4.8 | ||||
SanDisk uSDXC 64GB class 6 | 4.9 | 3.8 | archlinuxarm-29-04-2012 | Linux alarmpi 3.1.9+ #66 Thu May 17 16:56:20 BST 2012 | CrystalDiskMark results (FAT32) | |
TDK microSDHC 4GB, Class 4 (80-56-10301-004G) | 11.2 | 4.7 | Debian Wheezy "Raspbian" (2012-07-15) | 3.1.9+ #168 PREEMPT Sat Jul 14 18:56:31 BST 2012 | ||
Transcend SDHC 8GB class 6 | 5.8 | 5.8 | ||||
Transcend SDHC 8GB Class 6 (TS8GSDHC6) | 4.6 | 4.0 | Debian Squeeze "debian6-19-04-2012" | Linux raspberrypi 3.1.9+ #90 Wed Apr 18 18:23:05 BST 2012 armv61 GNU/Linux | Tested with dd. Card doesn't maintain the promised minimum class speed. | |
Transcend SDHC 8GB Class 4 (TS8GSDHC4) | 11.1 | 8.1 | Debian Wheezy "Rasbpian" | Linux raspberrypi 3.1.9+ #168 PREEMPT Sat Jul 14 18:56:31 BST 2012 armv6l GNU/Linux | man:0x000003 oem:0x5344 name:SD08G hwrev:0x8 fwrev:0x0 | |
Transcend microSDHC 8GB Kit, Class 4 (TS8GUSDHC4) | 4.7 | 3.7 | Raspbian Wheezy | Linux raspberry-pi 3.1.9+ #1 PREEMPT Wed Jun 6 16:26:14 CEST 2012 armv6l GNU/Linux | man:0x000003 oem:0x5344 name:SU08G hwrev:0x8 fwrev:0x0 | |
Transcend SDHC 4GB Class 6 | 9.8 | 8.8 | Fedora Remix FC14 | Linux raspi 3.1.9 #1 PREEMPT Sat Mar 3 21:58:00 UTC 2012 armv6l armv6l armv6l GNU/Linux | Not sure why this setup is faster than others, test results repeatable. | |
Transcend SDHC 16GB Class 10 | 20.3 | 11.9 | Debian Wheezy "Rasbpian" | Linux raspberry-pi 3.1.9-cutdown+ #173 | ||
Sandisk Extreme Pro SDHC 16GB Class 10 UHS-I (SDSDXPA-016G-A75) | 4.7 | 4.8 | debian6-19-04-2012 | Linux Raspi 3.1.9+ #66 Thu May 17 16:56:20 BST 2012 | Followed a forum post to install newest kernel from git repo. | |
SanDisk Extreme Pro SDHC 16GB Class 10 | 20.8 | 18.6 | Debian Wheezy "Raspbian" | Linux raspberrypi 3.1.9+ #125 PREEMPT Sun Jun 17 16:09:36 BST 2012 armv6l GNU/Linux | ||
Sandisk Ultra SDHC I Class 6 ("30MB/s") | 4.7 | 4.8 | Debian Wheezy "Raspbian" | 3.2.18+ #3 PREEMPT | Feels faster than my Kingston 4GB Class 4 card. | |
WINTEC FileMate Professional SDHC 16GB Class 10 (3FMSD16GBC10-R) | 4.6 | 4.5 | Debian Squeeze "debian6-19-04-2012" | Linux raspberrypi 3.1.9+ #95 PREEMPT Thu May 31 13:21:40 BST 2012 armv6l GNU/Linux | After installing new kernel with rpi-update on 2012-06-01 | |
Lexar SDHC 8GB Class 4 "Multi-use" | 18.9 | 6.8 | Debian Wheezy "Raspbian" | 3.1.9+ #110 PREEMPT | ||
Lexar SDHC 8GB Class 6 "PLATINUM II" | 19.7 | 10.1 | Debian Wheezy "Raspbian" | 3.1.9+ #168 PREEMPT | ||
Lexar SDHC 16GB Class 10 "PLATINUM II" | 5.3 | 4.8 | Debian Wheezy/sid | Linux raspberrypi 3.2.19-rpi1+ #3 | ||
Lexar SDHC 16GB Class 10 "PLATINUM II" | 18.9 | 9.0 | Debian Wheezy "Raspbian" | Linux raspbian 3.1.9+ #168 PREEMPT | Same card as 'Lexar SDHC 16GB Class 10 "PLATINUM II"' above - imaged with Raspbian | |
Mushkin SDHC 16GB Class 10 MKNSDHCC10-16GB | 19.7 | 10.9 | 2012-07-15-wheezy-raspbian | 3.1.9+ #168 PREEMPT | ||
Panasonic SDHC 4GB Class 10 UHS-I | 11.2 | 6.2 | Debian Wheezy "Raspbian" | 3.1.9+ #144 PREEMPT | Panasonic RP-SDU04GE1K |
NIC
Compile/Run
On LAN server:
iperf -s
On Raspberry Pi:
iperf -t 60 -c <SERVER_IP_ADDRESS> -d
Results
Bandwidth (Mbit/s) | CPU usage (top) | Distro | Kernel | Notes |
---|---|---|---|---|
52.1 + 46.4 | 5.1%us, 66.2%sy, 28.7%si | Debian Squeeze "debian6-19-04-2012" | Linux raspberrypi 3.1.9+ #95 PREEMPT | |
91.8 + 36.8 | 1.6%us, 60.8%sy, 37.5%si | Debian Wheezy "Raspbian" | Linux raspbian 3.1.9+ #101 PREEMPT | |
65.1 + 48.8 | 1.3%us, 61.9%sy, 36.8%si | Arch Linux 2012-04-29 | Linux alarmpi 3.1.9-12+ #5 Sat Apr 28 04:49:38 UTC 2012 armv6l ARMv6-compatible processor rev 7 (v6l) BCM2708 GNU/Linux | Remote host connected at gigabit |
69.5 + 29.1 | 0.6%us, 55.5%sy, 40.0%si | Debian Wheezy "Raspbian" | Linux rpi 3.1.9+ #168 PREEMPT | Remote connected at gigabit, values for si between 30 and 55 % |
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.
Task | Power use (mA) | Notes |
---|---|---|
Booting (without peripherals) | 120-400 | Taken from Agilent lab power supply readings. No composite/keyboard/mouse/network connected. HDMI was enabled but the cable was disconnected. |
Idling (HDMI on, network on) | 370 | Taken from Agilent lab power supply readings. No composite/keyboard/mouse connected. |
Idling (HDMI on, network off) | 320 | Taken from Agilent lab power supply readings. No composite/keyboard/mouse/network connected. |
1080p video playback | 750 | About 3h on 4 AA batteries |
Text editing | - | Same as idling |
Compiling C code | ? | |
Running a Python program | ? | |
Playing Quake III | ? |
|