a*****a
发帖数: 1429 | 1 当然路由器好些的话，机器好些的话还是有不同的
RT-AC68W和rMBP，隔两堵墙：
2.4G：
./iperf -c 192.168.1.222 -i 10 -t 60
------------------------------------------------------------
Client connecting to 192.168.1.222, TCP port 5001
TCP window size: 128 KByte (default)
------------------------------------------------------------
[ 4] local 192.168.1.17 port 54891 connected with 192.168.1.222 port 5001
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-10.0 sec 100 MBytes 84.3 Mbits/sec
[ 4] 10.0-20.0 sec 115 MBytes 96... 阅读全帖 |
|
a*****a
发帖数: 1429 | 2 Beamforming在我这里的区别
disable:
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-10.0 sec 120 MBytes 101 Mbits/sec
[ 4] 10.0-20.0 sec 123 MBytes 103 Mbits/sec
[ 4] 20.0-30.0 sec 121 MBytes 102 Mbits/sec
[ 4] 30.0-40.0 sec 122 MBytes 102 Mbits/sec
[ 4] 40.0-50.0 sec 123 MBytes 103 Mbits/sec
[ 4] 0.0-50.0 sec 610 MBytes 102 Mbits/sec
enable:
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-10.0 sec 135 MBytes 113 Mbits/sec
[ 4] 10.0-20.0 sec 138 MBytes ... 阅读全帖 |
|
a*****a
发帖数: 1429 | 3 这是隔着两堵墙测的。
在同一间房内
三米远：
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-10.0 sec 189 MBytes 159 Mbits/sec
[ 4] 10.0-20.0 sec 215 MBytes 180 Mbits/sec
[ 4] 20.0-30.0 sec 212 MBytes 178 Mbits/sec
[ 4] 30.0-40.0 sec 211 MBytes 177 Mbits/sec
[ 4] 40.0-50.0 sec 210 MBytes 176 Mbits/sec
[ 4] 0.0-50.0 sec 1.01 GBytes 174 Mbits/sec
将近一米远：
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-10.0 sec 215 MBytes 180 Mbits/sec
[ 4] 10.0-20.0 sec 222 MBytes 186... 阅读全帖 |
|
a*o
发帖数: 19981 | 4 c:down>iperf3 -c 192.168.1.200
Connecting to host 192.168.1.200, port 5201
[ 4] local 192.168.1.155 port 51825 connected to 192.168.1.200 port 5201
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.00 sec 112 MBytes 941 Mbits/sec
[ 4] 1.00-2.00 sec 113 MBytes 945 Mbits/sec
[ 4] 2.00-3.00 sec 112 MBytes 943 Mbits/sec
[ 4] 3.00-4.00 sec 112 MBytes 944 Mbits/sec
[ 4] 4.00-5.00 sec 112 MBytes 943 Mbits/sec
[ 4] 5.00-6.00 sec 112 MBytes ... 阅读全帖 |
|
Q**g
发帖数: 183 | 5 这个测试好。俺也玩了一下。三个地点，同一层楼隔一堵墙／不同层／不同层远距离
5G
24.8 MBytes/sec 18.7 MBytes/sec 14.1 MBytes/sec
2.4G
7.19 MBytes/sec 4.27 MBytes/sec 5.57 MBytes/sec
2.4G 中间那个位置离一个邻居的强AP近，所以反而不如远点那个快
Linksys E4200v1 + MBP |
|
l********l
发帖数: 9452 | 6
这个的nas performance灰常恐怖啊，下一代arm based的router一出，世面上的nas可
以集体下课了。。。
NETGEAR R7000 NETGEAR R6250 ASUS RT-AC68U ASUS RT-AC56U
Processor Broadcom BCM4709A Broadcom BCM47081A Broadcom BCM4708A
Broadcom BCM4708A
FAT32 Write (MBytes/s) 33.4 15.9 11.7* 19.8
FAT32 Read (MBytes/s) 57.4 25.6 21.6* 47.2
NTFS Write (MBytes/s) 36.8 17.6 23.6* 35.6
NTFS Read (MBytes/s) 57.7 25.7 24.3* 52.2 |
|
p*******g
发帖数: 660 | 7 路由器在一楼，书房在三楼。
一楼用TP-Link Archer C7 AC1750。三楼用TP-Link WDR4300做中继到有线给电脑使用
，通过5G与一楼的路由器连接。WDR4300不是AC路由器。
iperf测试无论上下行都在100M以上，下行稍微快点。2.4G在三楼虽然信号好点，但是
实际传输速率只有40M，最快50M+，但是不稳定。两台路由器都烧了openwrt，发射功率
都限制在17dbm。
iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 8.00 KByte (default)
------------------------------------------------------------
[184] local 192.168.1.114 port 5001 connected with 192.168.1.101 port 57760
[ ID] Interval ... 阅读全帖 |
|
t******o
发帖数: 3223 | 8 所谓的两大主流都是用的 BRCM, R7000是 BCM4709A, AC68U是BRCM4708A, C9是4709A
TP-LINK Archer C9 Linksys WRT1900AC Linksys EA6900 NETGEAR
R7000 ASUS RT-AC68U
Processor Broadcom BCM4709A Marvell MV78230 Broadcom BCM4708A
Broadcom BCM4709A Broadcom BCM4708A
FAT32 Write (MBytes/s) 22.8 28.7 14.5 24.8 11.8
FAT32 Read (MBytes/s) 28.7 31.0 21.0 27.8 24.0
NTFS Write (MBytes/s) 17.2 30.1 17.2 27.9 23.7
NTFS Read (MBytes/s... 阅读全帖 |
|
t**t
发帖数: 27760 | 9 Class 2: 2 MByte/s - 13x
Class 4: 4 MByte/s - 26x
Class 6: 6 MByte/s - 40x |
|
b*s
发帖数: 82482 | 10 7. How much memory can the iMac handle?
Apple's documentation says the iMac handles up to 128 Mbytes of memory
"using presently available memory devices" - that is, the highest-capacity
memory chips available at the time Apple was testing its design. At that
time the largest-capacity memory modules that complied with Apple's
specifications held 64 Mbytes of RAM. Since the iMac has room for two
memory modules, that translated into a limit of 128 Mbytes. But things move
fast in the world of comput |
|
c********r
发帖数: 649 | 11 13 WD3000BLFS 300GB Hard Drive $152 $1,976
1 SC216A-R900LPB 24 Bay Chassis $785 $785
1 SUPERMICRO X8DTL-iF Motherboard $305 $305
1 Intel Xeon E5620 CPU $395 $395
1 Patriot Signature 12GB (3 x 4GB) $429 $429
2 SAS3081E-R SAS HBA $190 $380
1 Supermicro SNK-P0038P Heatsink $20 $20
0 Intel x25-e SSD $349 $0
2 2.5 HARD DRIVE $50 $100
$4,390
4 x 3 RaidZ
1 x Raid M... 阅读全帖 |
|
d****n
发帖数: 12461 | 12 ☆─────────────────────────────────────☆
atnalta (职业debugger) 于 (Fri May 4 14:45:08 2012, 美东) 提到:
一个朋友买了垃圾油，让我帮着刷Firmware。趁这个机会昨天晚上做了一些测试。
我手头没有300M的2.4G卡。今天晚上回家后用公司笔记本在做WIFI传输速度的测试。
手头有四个路由器，WRT-54GS, E2000, RT-N56U和垃圾油。WRT-54GS就不比较了。
E2000和垃圾油都刷成dd-wrt，同一个版本。
都采用Channel 1, N only, 20Mhz。同样的输出功率74mw
RT-N56U是stock firmware
信号强度
RT-N56U 平均51db
E2000平均62db
垃圾油平均75db
有线传输速度
RT-N56U 980Mbps
E2000 760Mbps
垃圾油 560Mbps
150M 2.4G, 20MHz
RT-N56U 56Mbps
E2000 42Mbps
垃圾油 26Mbps
无线测试用的是MBA。用jperf和Linux... 阅读全帖 |
|
s***g
发帖数: 495 | 13 2.4G:
(%5)(18:03)(air)~> iperf -c punk
------------------------------------------------------------
Client connecting to punk, TCP port 5001
TCP window size: 129 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.0.17 port 50337 connected with 192.168.0.1 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 46.4 MBytes 38.9 Mbits/sec
5G:
(%5)(18:03)(air)~> iperf -c punk
---------------------------------------------------------... 阅读全帖 |
|
c*******n
发帖数: 671 | 14 前段时间买了个SD card, 用h2testw.exe测试写速度也有8MByte/s, 见下，可是实际用
起来，拷贝个文件夹，速度为1MByte/s!!!,这是为什么啊？
Warning: Only 200 of 30531 MByte tested.
Test finished without errors.
You can now delete the test files *.h2w or verify them again.
Writing speed: 8.38 MByte/s
Reading speed: 16.4 MByte/s
H2testw v1.4 |
|
c********r
发帖数: 649 | 15 13 WD3000BLFS 300GB Hard Drive $152 $1,976
1 SC216A-R900LPB 24 Bay Chassis $785 $785
1 SUPERMICRO X8DTL-iF Motherboard $305 $305
1 Intel Xeon E5620 CPU $395 $395
1 Patriot Signature 12GB (3 x 4GB) $429 $429
2 SAS3081E-R SAS HBA $190 $380
1 Supermicro SNK-P0038P Heatsink $20 $20
0 Intel x25-e SSD $349 $0
2 2.5 HARD DRIVE $50 $100
$4,390
4 x 3 RaidZ
1 x Raid Mirr... 阅读全帖 |
|
S*A
发帖数: 7142 | 16
你的依据是什么，我们能用 datasheet 来说明吗？
你说得控制转换器就是 APB bridge。 这个是 AR9344
自带的。这个也很清楚说明这个 mapping 是硬件
实现的。
2.5 APB Bridge
One 16 MByte window of the AHB address
space is devoted to an APB device mapper. The
APB space contains the register address spaces
of most of the interfaces, including serial flash,
^^^^^^^^^^^^^^^^
GPIO, and UART. This space also provides
access to the watchdog timer and four general
purpose timers.
这个你自己 quote 过，你自己看懂了吗？ 用外部 pin 来决定
是使用内部 RO买还是直接从外部 Flash 启动，... 阅读全帖 |
|
S*A
发帖数: 7142 | 17
你的依据是什么，我们能用 datasheet 来说明吗？
你说得控制转换器就是 APB bridge。 这个是 AR9344
自带的。这个也很清楚说明这个 mapping 是硬件
实现的。
2.5 APB Bridge
One 16 MByte window of the AHB address
space is devoted to an APB device mapper. The
APB space contains the register address spaces
of most of the interfaces, including serial flash,
^^^^^^^^^^^^^^^^
GPIO, and UART. This space also provides
access to the watchdog timer and four general
purpose timers.
这个你自己 quote 过，你自己看懂了吗？ 用外部 pin 来决定
是使用内部 RO买还是直接从外部 Flash 启动，... 阅读全帖 |
|
y*****d
发帖数: 4451 | 18 the average file size of a 1080p file runs about 330 MB/min, or 5.5 MB/sec.
According to SDHC.org, The SD Speed Class Ratings specify the following
minimum write speeds based on "the best fragmented state where no memory
unit is occupied":
Class 4: 32 MBits/s (4 MByte/s)
Class 6: 48 MBits/s (6 MByte/s) |
|
a*****a
发帖数: 1429 | 19 一个朋友买了垃圾油，让我帮着刷Firmware。趁这个机会昨天晚上做了一些测试。
我手头没有300M的2.4G卡。今天晚上回家后用公司笔记本在做WIFI传输速度的测试。
手头有四个路由器，WRT-54GS, E2000, RT-N56U和垃圾油。WRT-54GS就不比较了。
E2000和垃圾油都刷成dd-wrt，同一个版本。
都采用Channel 1, N only, 20Mhz。同样的输出功率74mw
RT-N56U是stock firmware
信号强度
RT-N56U 平均51db
E2000平均62db
垃圾油平均75db
有线传输速度
RT-N56U 980Mbps
E2000 760Mbps
垃圾油 560Mbps
150M 2.4G, 20MHz
RT-N56U 56Mbps
E2000 42Mbps
垃圾油 26Mbps
无线测试用的是MBA。用jperf和Linux服务器iperf连接。和路由器楼上楼下隔两个房间
，其中一堵墙是承重墙。垃圾油的速度太悲催了。测试的最大速度都没有超过30Mbps，
不到RT-N56U的一半。
测完40Mhz 300M模式后，会建议朋友出... 阅读全帖 |
|
w*****g
发帖数: 198 | 20 452-Maximum Quota exceeded. Transfer aborted.
452 Disk Quota - Current : 954 Mbytes - Max : 954 Mbytes - Available : 4491 bytes
you only have 4491 bytes left on you HD!! |
|
o*****D
发帖数: 1563 | 21 太夸张了！
我知道GPS卫星是广播，不是双向的
但是有无穷多的通讯卫星啊
也许有人说，信道容量不够
全球任何时候有多少架飞机在飞？
据网上多处资料，任何时候，大概有7000家飞机，包括各种各类的大小飞机，在美国上
空飞行。
全世界算3倍，约20,000架
2万架飞机的，每秒一个GPS信号，算他1KBytes信息了
总共多少信息？才20M Bytes啊！
每秒20 MBytes 对通信卫星来说，根本就是毛毛雨！ |
|
N*T
发帖数: 414 | 22 比如说，一张照片，一张高清晰的矢量数据图。他非把这两张图整合到一起，矢量图变
成了bitmap image。分辨率不高的话，一切都是模模糊糊的，要是高分辨率的话，图就
大的不可收拾，几十Mbyte。本来一张eps/emf的矢量图只要几百kbyte就够了。这些东
西我从多年前就说，数据图要保持矢量模式，不要变成image。但是一直到毕业了还是
无法形成自觉保持矢量图的习惯。
写作上，我一直说，作为外国人，最主要的是用简单的句子把idea表达清楚。可是人家
仍然是把一大堆无法在正文里面说清楚的东西放在括号里面。本来技术的内容就很复杂
，艰涩难懂的行文方式让读者很快就感到疲乏了。 |
|
p**q
发帖数: 535 | 23 a few days ago, i setup 2 belkin wireless 11g router for wireless bridge.
then copy 200g data from a USB hard drive to a HP media server.
it's so slow on wireless.
11g is about 20M in reality. then with wireless bridge, it's cut to half to
10Mbps.
So I connected both server and the laptop with the USB HD to two 100m ports
of one belkin router. it took a whole night!
200g bytes/10 Mbyte per second=5 hours
for something like what i did, you definitely need a gig switch |
|
r*****o
发帖数: 334 | 24 USB 2.0：2000年4月释出。
增加更高的數據傳輸速率480 Mbit/s（现在称作Hi-Speed），但受限于BOT传输协议和
NRZI编码方式，实际最高传输速度只有30 MByte/s左右。
USB 3.0于2008年11月释出，
速度由480MBps大幅提升到5Gbps。USB 3.0插座通常是藍色的，並向後相容USB 2.0。
http://zh.wikipedia.org/wiki/通用串行總線#USB_2.0 |
|
b****n
发帖数: 3343 | 25 USB 3.0 实际高传输速度有 100 MByte/s左右。 |
|
|
y*********e
发帖数: 7269 | 27 Class2是比较慢速的卡，按照标准，Class 2: 16 Mbit/s (2 MByte/s）
在KX上面使用情况大概如下：
720p录像，
一颗星压缩，无停滞现象，可以一直录下去到卡满
二颗星压缩，试着录一分钟，写卡稍有停滞现象，估计录个10分钟会产生溢出而无法继
续录下去。
三颗星压缩，没有实验，估计录不了多少时间。
结论，对拍录像影响不大，因为录像中一星和三星的效果差不多。
JPG拍摄
12M，三星，连拍大概只能一秒两张
10M，二星，差不多才能凸显KX连拍每秒4.7张的能力。
用RAW，连拍的时候，差不多也能一秒一张到两张，但是屏幕上面回放还是很慢，很痛
苦。
所以建议用于K－X的SD卡，还是从Class6以上选择比较靠谱。除非Class2是免费的，用
来拍点10M的家用照片和录像还凑活。 |
|
|
b*s
发帖数: 82482 | 29 8. Will I void my warranty if I add memory to the iMac myself?
Not necessarily. The iMac's two memory sockets are both on the system's
processor module - a small circuit board that also holds the G3 processor
and plugs into the main logic board - but one socket is on the top of it
and one is on the bottom.
As the iMac ships, the upper socket is empty, while the lower one has one
32-Mbyte SO-DIMM installed. Apple allows you to add memory to the upper
socket without voiding the warranty.
Note that |
|
b*s
发帖数: 82482 | 30 9. Can I add more video memory to the iMac, and if I do, what good will it
do me?
The iMac comes with 2 Mbytes of video memory called SGRAM (Synchronous
Graphics RAM) on its logic board. That's enough to let you run its display
with up to 24-bit color ("millions of colors") at resolutions of 640 by 480
pixels or 800 by 600 pixels. It handles up to 16-bit color ("thousands of
colors") at the screen's maximum resolution of1,024 by 768 pixels.
The iMac logic board has a socket where you can add an |
|
b*s
发帖数: 82482 | 31 10. Is the iMac's processor upgradable?
Don't count on it. The CPU is removable, in a sense -- it's on a small
"processor module" (a.k.a "daughterboard"), a separate circuit board that
plugs into the iMac's main logic board. But this module contains much more
than just a PowerPC G3 chip -- it also holds 512 Kbytes of backside Level 2
cache memory, the 1-Mbyte system ROM that enables the iMac to start up when
you press the power button, the system's two sockets for main memory, and
the chip (a Mo |
|
b*s
发帖数: 82482 | 32 Winstation USB SuperDisk蔖rice: $150蔄vailability: Now
Winstation's USB SuperDisk drive, like the one from Imation, can read and
write both standard 1.4-Mbyte floppies and the high-density LS-120 disks. |
|
m******p
发帖数: 5393 | 33 唉，都除以8就不好玩儿了
实际下载速率 3 mega bit per sec/8 = 0.375 MBytes/sec = 375KBytes/s
要真是能到达理论上的9Mb/s - 12Mb/s，那除以8还能超过1兆每秒和家里最基本的fios
接近 |
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g*****a
发帖数: 446 | 34 感觉换了千兆网以后，平时传文件还是挺慢的
今天用iperf测了一下，一半速度都没有，单线程尤其慢。
不知道这瓶颈出在哪里？网卡？网线？交换机？TCP参数设置？
谢谢
PC1为主板集成的intel pro/1000网卡
PC2为主板集成的reltek网卡
交换机为D-Link DGS-2208
连线为普通6类线
单线程 intel->reltek
[ ID] Interval Transfer Bandwidth
[3944] 0.0-30.0 sec 529 MBytes 148 Mbits/sec |
|
m*******a
发帖数: 192 | 35 western digital my book 750 Mbytes,
求救，请指教。 |
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N****w
发帖数: 21578 | 36 2-4 MBytes/sec or Mbits/sec? |
|
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x*z
发帖数: 1010 | 41 你这个是 10 MBytes/s 还是 10 Mbits/s？前者的话我只能说这速度太赞了，
后者的话应该不会吧，难道是个残次品？USB 1.1都比它强。
. |
|
a*****a
发帖数: 1429 | 42 调节了一下，试了几次,有线最大速度接近了700Mbps.比650Mbps好点。
------------------------------------------------------------
Client connecting to 192.168.2.105, TCP port 5001
TCP window size: 63.0 KByte (default)
------------------------------------------------------------
[1912] local 192.168.2.142 port 3124 connected with 192.168.2.105 port 5001
[ ID] Interval Transfer Bandwidth
[1912] 0.0-10.0 sec 832 MBytes 698 Mbits/sec
顺便测了WAN口，是100Mbps的。那个接口倒不错，居然测出了102Mbps。 |
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g*******t
发帖数: 7704 | 44 nas速度都是Mbyte， 600m的cpu的写速度都能轻松10MB，
arm上G的cpu写入基本都能20～40MB， |
|
b****3
发帖数: 201 | 45 Just have CPUZ installed in the new desktop, here is what I found on "Memory
" tab:
Type DDR3
SIZE: 4096 MBYTES
DRAM FREQUENCY 798.60 MHZ
CL: 11.0 CLOCKS
TRCD: 6 CLOCKS
TRP: 5 CLOCKS
TRAS 15 CLOCKS
TRC 16 CLOCKS
Does that mean the timing is CL11 6-5-15-16?
According to memory card specification listed on HP.com, shouldn't DRAM
Frequency 1600 MHZ? confused
Haven't get chinese input installed, sorry about it. |
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