- January
- 5th
- 2009
goDaddy private registration for free
Posted by MaEl in: Bits-and-Bytes Comments (1)
It happen that goDaddy left some hole into their sales promotion. This time for private registration.
The promotion is : Read the rest of this entry »
- October
- 31st
- 2008
vista on ssd : set ntfs allocation size to 64k
Posted by MaEl in: Bits-and-Bytes Comments (0)
To unleashed the performance of SSD, we need to set the block size to at least 64k. See the benchmark here. Of course it came with some side effect. You’ll lose some of usable disk space. I don’t have the tool to resize the allocation size. Partition Magic 8 doesn’t work either so, I opt for fresh install instead.
- October
- 22nd
- 2008
back from the death
Posted by MaEl in: Personal-Stuff Comments (1)
The server had a major downtime due to unbootable motherboard. Previously the same thing had happen but I just sent the motherboard(EPIA-SN 18000G) for RMA. Without knowing the cause, a week later they sent me a brand new motherboard.
- October
- 1st
- 2008
low level format hdd using dd
Posted by MaEl in: Bits-and-Bytes Comments (0)
Need to securely wipe HDD data?? Got 2nd-hand HDD?? Got bad sector?? Yes, It’s time to do a low level format(Zero-fill). In Linux, we can use dd. The command is as simple as
dd if=/dev/zero of=/dev/hda &
[1] 5645
Set it as background process and it will print out the PID. This process takes a while depending on the HDD size.WARNING! This will destroy ALL data on the HDD, all boot sector info and all data on all partitions. To watch the status, just enter
kill -SIGUSR1 5645replace 5645 with the PID
62796+0 records in
62796+0 records out
65846378496 bytes (66 GB) copied, 1748.1 s, 37.7 MB/s
- August
- 16th
- 2008
Global Positioning from PING response time
Posted by MaEl in: Bits-and-Bytes Comments (0)
PING probably the most popular tool to determine network response time.
How PING works??
The PING program works much like a sonar echo-location, sending a small packet of information containing an ICMP ECHO_REQUEST to a specified computer, which then sends an ECHO_REPLY packet in return.Ping shows the time for a roundtrip, i.e. 2 x the distance.
Some PING test on piXca.net
location avg.(ms) |
location avg.(ms) |
Santa Clara, U.S.A. 132.7 Florida, U.S.A. 197.5 Vancouver, Canada 119.0 Austin1, U.S.A. 171.9 New York, U.S.A. 202.2 Austin, U.S.A. 171.5 San Francisco, U.S.A. 120.5 Hong Kong, China 62.6 Sydney, Australia 135.7 Amsterdam3, Netherlands 239.0 Chicago, U.S.A. 155.6 Amsterdam2, Netherlands 240.8 Stockholm, Sweden 294.0 London, United Kingdom 241.4 Munchen, Germany 217.0 |
Singapore, Singapore 97.2 Cologne, Germany 279.0 Paris, France 243.7 Amsterdam, Netherlands 240.4 Melbourne, Australia 170.5 Krakow, Poland 297.4 Cagliari, Italy 259.4 Madrid, Spain 301.5 Copenhagen, Denmark 287.5 Lille, France 249.6 Zurich, Switzerland 281.7 Porto Alegre, Brazil 336.4 Johannesburg, South Africa 482.1 Shanghai, China 377.0 |
(PING done by http://www.just-ping.com/)
Nearest City –> Hong Kong (approx 30ms).
Most far City –> Johannesburg (approx 241ms).
Let say my server located somewhere in Tokyo.
The distance between Tokyo – Hong Kong is 3000km.
Given that almost cities connected by under sea fiber cable so, the network
speed is theoretically limited by the speed of light. (approx 3×10^8 m/s).
Some speed calculations:
Hong Kong : 3000 km / 30 ms = 1.00×10^8 m/s
Singapore : 5500 km / 47 ms = 1.17×10^8 m/s
Vancouver : 7700 km / 60 ms = 1.28×10^8 m/s
the results is 1/3 of light speed..
so slow.. why??
# The actual distance traveled will be longer, more like zig zag than a straight line.
# Repeaters, switches and routers will slow down transfer speeds. The more equipment the signal has to pass through (for example routers), the longer it will take to reach its target.
# The actual speed of the signal will never quite match the speed of light. Even with fiber optics (glass) the speed of light is about 30% slower than through vacuum or air, and most of the distance covered will be through fiber.
# A beam of light bounces around like a pinball when it travels along the thin (admittedly extremely thin) fiber, and that will of course make the distance traveled even longer.
World map of submarine cable systems
No wonder Johannesburg is super slow
Read the rest of this entry »
- August
- 14th
- 2008
There is no middle…
Posted by MaEl in: Personal-Stuff Comments (1)
If you can’t be a rocket scientist, get back to farming, make some bucks, invest, earn, skip the middle, and give the rocket scientists their marching orders
Read the rest of this entry »
- August
- 8th
- 2008
LPT Wireless Print Server Hacked –> 8bits output
Posted by MaEl in: Do-it-Yourself Comments (4)
- July
- 27th
- 2008
Eee PC upgrade : 802.11n wifi module
Posted by MaEl in: Do-it-Yourself Comments (0)
My broadband router support the latest Draft N(802.11n) standard but the default Mini PCIe-WIFI card on Eee PC only support 802.11b/g. The 54Mpbs is ok but sometime I need a greater speed especially to transfer files. To make full use the technology and availability, I decided to upgrade my Eee PC wifi to support the 802.11n standard. I found cheap Intel 4965 AGN Mini PCI-e WIFI card in local auction site.
- July
- 6th
- 2008
Accessing serial console on the wisecam
Posted by MaEl in: Mobility-Gadget Comments (2)
- July
- 5th
- 2008
Infrared Network Camera
Posted by MaEl in: Mobility-Gadget Comments (0)
