Interested in Windows, Networking, Cisco, HTML, Powershell, Perl, Outlook, Exchange, Troubleshooting
3/12/2002
CTX432571 - How to Disable Printing Notification Dialog Boxes in on a Windows NT Terminal Server with MetaFrame 1.x How to Disable Printing Notification Dialog Boxes in on a Windows NT Terminal Server with MetaFrame 1.x
INFORMATION OVERLOAD
We are already dealing in terabytes. In case you were wondering what comes
after that and how big is that really...
Kilobyte - (1,000 bytes) a very short story
Megabyte - (1,000,000 bytes) a small novel
Gigabyte - (1 billion bytes) Beethoven's 5th Symphony
Terabyte - (1,000 gigabytes) all the X-rays in a large hospital
Petabyte - (1,000 terabytes) half the contents of all US academic research
libraries
Exabyte - (1,000 petabytes) 5 exabytes - all the words people have ever
spoken
Zettabyte - 1,000 exabytes) as much information as there are grains of sand
on all the world's beaches.
Yottabyte - (1,000 zettabytes) as much information as there are atoms in
7,000 human bodies.
The world produced about three exabytes of new information in 2000, the
equivalent of about 500 novel-sized books,
or two floppy disks, for every man, woman, and child on earth.
- More new information will be created over the next two years than has been
created over the entire history of mankind.
- The amount of new information being created is doubling every year, with
no end in sight.
- Print comprises only .003 percent of the total.
- More information by far is created by individuals than businesses, a trend
researchers call the "democratization" of information.
- Already more than 80 billion photographs are taken every year, which would
require 80 million times more digital information storage than the same
number of words.
We are already dealing in terabytes. In case you were wondering what comes
after that and how big is that really...
Kilobyte - (1,000 bytes) a very short story
Megabyte - (1,000,000 bytes) a small novel
Gigabyte - (1 billion bytes) Beethoven's 5th Symphony
Terabyte - (1,000 gigabytes) all the X-rays in a large hospital
Petabyte - (1,000 terabytes) half the contents of all US academic research
libraries
Exabyte - (1,000 petabytes) 5 exabytes - all the words people have ever
spoken
Zettabyte - 1,000 exabytes) as much information as there are grains of sand
on all the world's beaches.
Yottabyte - (1,000 zettabytes) as much information as there are atoms in
7,000 human bodies.
The world produced about three exabytes of new information in 2000, the
equivalent of about 500 novel-sized books,
or two floppy disks, for every man, woman, and child on earth.
- More new information will be created over the next two years than has been
created over the entire history of mankind.
- The amount of new information being created is doubling every year, with
no end in sight.
- Print comprises only .003 percent of the total.
- More information by far is created by individuals than businesses, a trend
researchers call the "democratization" of information.
- Already more than 80 billion photographs are taken every year, which would
require 80 million times more digital information storage than the same
number of words.
3/06/2002
Tuning TcpMaxDataRetransmissions rate:
TCP/IP uses the initial packet round-trip time at the moment when the
session is initiated to determine what is "normal" for that connection.
Because of this, it is better to have a consistently slow WAN connection and
worse to have a connection that starts out fast and then becomes slow. Such
an erosion of connection speed is common when the connection is opened in
the morning and maintained into the work day.
To accommodate for this erosion of bandwidth, we modify the
TcpMaxDataRetransmissions value in the Citrix server registry.
TCP starts a retransmission timer when each outbound segment is handed down
to IP. If no acknowledgment is received for the data in a given segment
before the timer expires, the segment is retransmitted, up to the
TcpMaxDataRetransmissions times. The default value for this parameter is 5.
The retransmission timer is initialized to 3 seconds when a TCP connection
is established; however, it is adjusted "on the fly" to match the
characteristics of the connection using Smoothed Round Trip Time (SRTT)
calculations. The timer for a given segment is doubled after each
retransmission of that segment.
Using this algorithm, TCP tunes itself to the "normal" delay of a
connection. Because the default number of retries is five, the round-trip
time can double four times (or in other words become 16X slower than its
initial value) before the session is dropped. By increasing this number to
10, you are allowing the round-trip time to double nine times instead of
four, thereby allowing the connection quality to erode up to 512X its
original value before being dropped. For example, a connection that begins
with a roundtrip time of 20 milliseconds would have to erode to a round-trip
time of 10,240 milliseconds before being dropped by the server.
TCP/IP uses the initial packet round-trip time at the moment when the
session is initiated to determine what is "normal" for that connection.
Because of this, it is better to have a consistently slow WAN connection and
worse to have a connection that starts out fast and then becomes slow. Such
an erosion of connection speed is common when the connection is opened in
the morning and maintained into the work day.
To accommodate for this erosion of bandwidth, we modify the
TcpMaxDataRetransmissions value in the Citrix server registry.
TCP starts a retransmission timer when each outbound segment is handed down
to IP. If no acknowledgment is received for the data in a given segment
before the timer expires, the segment is retransmitted, up to the
TcpMaxDataRetransmissions times. The default value for this parameter is 5.
The retransmission timer is initialized to 3 seconds when a TCP connection
is established; however, it is adjusted "on the fly" to match the
characteristics of the connection using Smoothed Round Trip Time (SRTT)
calculations. The timer for a given segment is doubled after each
retransmission of that segment.
Using this algorithm, TCP tunes itself to the "normal" delay of a
connection. Because the default number of retries is five, the round-trip
time can double four times (or in other words become 16X slower than its
initial value) before the session is dropped. By increasing this number to
10, you are allowing the round-trip time to double nine times instead of
four, thereby allowing the connection quality to erode up to 512X its
original value before being dropped. For example, a connection that begins
with a roundtrip time of 20 milliseconds would have to erode to a round-trip
time of 10,240 milliseconds before being dropped by the server.
3/04/2002
CTX111133 - Maximizing Performance with Internet Explorer Document ID: CTX111133
This solution pertains to:
MetaFrame 1.8 for Microsoft NT Server 4.0, Terminal Server
Last modified: Thu Jan 04 10:34:29 2001
Maximizing Performance with Internet Explorer
“Setting up Personalized Settings” in Internet Explorer 4.0 may cause CPU congestion. Completely remove the following registry key (which runs the “Personalized Settings” setup and other Internet Explorer 4.0 settings at logon) for dramatic performance increase:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run BrowserWebCheck: REG_SZ: loadwc.exe
This solution pertains to:
MetaFrame 1.8 for Microsoft NT Server 4.0, Terminal Server
Last modified: Thu Jan 04 10:34:29 2001
Maximizing Performance with Internet Explorer
“Setting up Personalized Settings” in Internet Explorer 4.0 may cause CPU congestion. Completely remove the following registry key (which runs the “Personalized Settings” setup and other Internet Explorer 4.0 settings at logon) for dramatic performance increase:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run BrowserWebCheck: REG_SZ: loadwc.exe
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