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Operating Systems AIX AIX server problem - network connection is unstable ! Post 303044691 by Neo on Sunday 1st of March 2020 11:13:27 PM
Old 03-02-2020
Reference:

Network delay - Wikipedia

Quote:
Network delay is an important design and performance characteristic of a computer network or telecommunications network. The delay of a network specifies how long it takes for a bit of data to travel across the network from one communication endpoint to another. It is typically measured in multiples or fractions of seconds. Delay may differ slightly, depending on the location of the specific pair of communicating endpoints. Engineers usually report both the maximum and average delay, and they divide the delay into several parts:

Processing delay - time it takes router to process the packet header
Queuing delay - time the packet spends in routing queues
Transmission delay - time it takes to push the packet's bits onto the link
Propagation delay - time for a signal to reach its destination
There is a certain minimum level of delay that will be experienced due to the time it takes to transmit a packet serially through a link. Onto this is added a more variable level of delay due to network congestion. IP network delays can range from just a few milliseconds to several hundred milliseconds.
Your occasional delay of 44ms is small and normal for Ethernets. In addition, each h/w device (LAN card for example) can have a different characteristic. The more devices on the LAN segment, the more of a chance for crosstalk, etc.

If you need better performance, all network engineers, not only me, will advise you to put the two devices on their own (dedicated) LAN segment. This is the only way to insure the LAN segment delay is minimal.

If you don't want to believe a network systems engineer with over 30 years IP and Internet-based networking experience (33+ to be more exact), maybe you will believe the myriad references on the Internet:

Networking 101: Primer on Latency and Bandwidth - High Performance
Browser Networking (O'Reilly)


(just one of hundreds / thousands of examples on the net which discuss this topic.)

In addition, ping does not measure latency nor does it measure round-trip time. It measures ICMP echo request response time. ICMP messages run with low priority and take longer than other traffic. This means that if any single host on your network is "talking" at the same time (cross talk), your ping packet will be delayed.

As I mentioned, 44 ms is not much delay. It is 44/1000 of second.

If you need faster times between two devices on the same LAN segment, the #1 solution is to move the devices to their own LAN segment.
 

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KBDRATE(8)						     Linux Programmer's Manual							KBDRATE(8)

NAME
kbdrate - reset the keyboard repeat rate and delay time SYNOPSIS
kbdrate [ -s ] [ -r rate ] [ -d delay ] DESCRIPTION
kbdrate is used to change the keyboard repeat rate and delay time. The delay is the amount of time that a key must be depressed before it will start to repeat. Using kbdrate without any options will reset the repeat rate to 10.9 characters per second (cps) and the delay to 250 milliseconds (ms) for Intel- and M68K-based systems. These are the IBM defaults. On SPARC-based systems it will reset the repeat rate to 5 cps and the delay to 200 ms. OPTIONS
-s Silent. No messages are printed. -r rate Change the keyboard repeat rate to rate cps. For Intel-based systems, the allowable range is from 2.0 to 30.0 cps. Only certain, specific values are possible, and the program will select the nearest possible value to the one specified. The possible values are given, in characters per second, as follows: 2.0, 2.1, 2.3, 2.5, 2.7, 3.0, 3.3, 3.7, 4.0, 4.3, 4.6, 5.0, 5.5, 6.0, 6.7, 7.5, 8.0, 8.6, 9.2, 10.0, 10.9, 12.0, 13.3, 15.0, 16.0, 17.1, 18.5, 20.0, 21.8, 24.0, 26.7, 30.0. For SPARC-based systems, the allowable range is from 0 (no repeat) to 50 cps. -d delay Change the delay to delay milliseconds. For Intel-based systems, the allowable range is from 250 to 1000 ms, in 250 ms steps. For SPARC systems, possible values are between 10 ms and 1440 ms, in 10 ms steps. -V Display a version number and exit. BUGS
Not all keyboards support all rates. Not all keyboards have the rates mapped in the same way. Setting the repeat rate on the Gateway AnyKey keyboard does not work. If someone with a Gateway figures out how to program the keyboard, please send mail to util-linux@math.uio.no. All this is very architecture dependent. Nowadays kbdrate first tries the KDKBDREP and KIOCSRATE ioctls. (The former usually works on an m68k machine, the latter for SPARC.) When these ioctls fail an ioport interface as on i386 is assumed. FILES
/etc/rc.local /dev/port Linux 1.1.19 22 June 1994 KBDRATE(8)
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