Faster than 2000Hz / TCP takes too long

1. How can we get faster than 500µs (2000Hz) on an PXI RT-8145 System? 502µs,501µs works fine, but 500 or lower the System doesnt respond. We loose connection to the RT System, also the RT-System Manager doesn´t respond. It doesn´t make any difference which VI we use. With 501µs we have an CPU usage about 91%.
2. If our program start´s, it takes always 1.24min to connect over TCP/IP. We tried all timing an loop-rates, but it´s always the same time.Message Edited by prol on 04-11-2005 07:58 AM

Could you describe in a bit more detail your application, including the code running in your host aplication and the code running in LV RT on the 8145 controller.
What type of I/O operations are your performing?
I assume you want to communicate between the host and LV RT application at 2000 Hz or faster? Why do you need these fast loop rates in your communication? What is the overall purpose of the application? In general TCP/IP is not well suited for fast loop rates, i.e. sending small packets back and forth at high rates. it is more designed for streaming data, sedning larger packets at high data rates in one direction. It sounds like you may be trying to setup a closed loop controller across Ethernet which will have a maximum looop rate around the rates you are describing.
On your second question, please describe what you mean by 'program starts'. What is the sequence of operation on the host and RT system? Do you reboot or start either of these two systems at this time? How is you Ethernet configured? Specifically how are IP addresses assigned to the two systems? Do you have a DHCP server on the network or are the IP addresses statically assigned? If neither is true, Windows will take about a minute to a minute and half to assign its own IP addresses.
Christian Loew, CLA
Principal Systems Engineer, National Instruments
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+####<Feb 29, 2012 12:11:03 PM EST> <Info> <Deployer> <entwl3t-vm.co.pinellas.fl.us> <Pinellas1tMS3> <[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1330535463373> <BEA-149059> <Module copyrequest of application copyrequest [Version=COPYREQUEST0002bb] is transitioning from STATE_NEW to STATE_PREPARED on server Pinellas1tMS3.>+
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+####<Feb 29, 2012 1:00:42 PM EST> <Info> <Diagnostics> <entwl3t-vm.co.pinellas.fl.us> <Pinellas1tMS3> <[ACTIVE] ExecuteThread: '1' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1330538442301> <BEA-320145> <Size based data retirement operation completed on archive EventsDataArchive. Retired 0 records in 0 ms.>+
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Edited by: john wang on Feb 29, 2012 10:37 AM
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Firefox use to be very fast. Now it takes a long time for pages to load. There is no malware or spyware. Hardware is working right. Have started using Safari to get the speed I use to get before, but I miss Firefox. I disabled all my addons and plugins and still at times it reminds me of dial up. I have a cable connection of +15 mps. I also constantly clean my cache so it isn't that. IE is much, much faster as well. I have totally uninstalled it and reinstalled it as well, but it doesn't help.

Maybe it is a problematic add-on? At the top of the Firefox window, select Help<Restart With Add-ons Disabled. This will start Firefox in safe mode. If you notice anything is faster, than chances are the problem you were having was an extension. Disable all of them, then begin enabling them one by one. Restart each time you disable an add-on. If you notice Firefox is slow after enabling a certain add-on, then, problem solved (hopefully).
Another thing you can do is install FasterFox, a helpful add-on that increases the speed of Firefox. Download here: https://addons.mozilla.org/en-US/firefox/addon/fasterfox-9148/

Having lagging problems with YouTube videos, it simply takes so long for the red bar to completely load and the videos frequently pause and take too long to restart playing again.

I have been having lagging problems with YouTube videos for a number of months now. It simply takes so long for the red bar to completely load and the videos frequently pause and take too long to restart playing again. Even with little 2 and 3 minute videos.
I have a fast computer and my webpages load really, really fast. I have FireFox 4 browser and a Vista Home Premium 64-bit OS. So I don't have a slow computer or web browser. But these slow YouTube vids take way too long to load for some reason.
Does anyone have any idea how I can speed up YouTube?

Hi
The forums are customer to customer in the first instance, Only the mods (BT) will ask for personal information through a email link. Would you mind posting your Hub stats & BT speed test results this will help all with diagnosis-
To post the full stats from your router
for home hub - 192.168.1.254
Navigate to ADSL Settings or use the A-Z at the top right
Click on More Details and then post the results.
Run BT speed tester and post the results from http://speedtester.bt.com/
If possible it would be best to connect to the BT master socket this will rule out any telephone/broadband extension wiring also consider the housing of the hub/router as anything electrical can cause problems as these are your responsibility, if these are found to be the case Openreach (engineer) will charge BT Broadband, which will be passed onto you, around £130.00.
Noisy line! When making telephone calls, if so this is not good for your broadband, you can check-
Quite line test dial 17070 option 2 and listen - should hear nothing best done with old type analogue phone digital (dect) will do but may have slight hiss If you hear noise- crackling pops etc, report it as a noisy line on your phone, don’t mention broadband, Bt Faults on 151.
As for your FTTC its available in some areas between 40% & 80% of customers in enabled areas can receive it!
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Sometimes my computer takes too long to connect to new website. I am running a pretty powerful work program at same time, what is the best solution? Upgrading speed from cable network, is it a hard drive issue? do I need to "clean out" the computer?

Many times my computer takes too long to connect to new website. I have wireless internet (time capsule) and I am running a pretty powerful real time financial work program at same time, what is the best solution? Upgrading speed from cable network? is it a hard drive issue? do I only need to "clean out" the computer? Or all of the above...not to computer saavy. It is a Macbook Pro osx 10.6.8 (late 2010).

Almost certainly none of the above! Try each of the following in this order:
Select 'Reset Safari' from the Safari menu.
Close down Safari; move <home>/Library/Caches/com.apple.Safari/Cache.db to the trash; restart Safari.
Change the DNS servers in your network settings to use the OpenDNS servers: 208.67.222.222 and 208.67.220.220
Turn off DNS pre-fetching by entering the following command in Terminal and restarting Safari:
defaults write com.apple.safari WebKitDNSPrefetchingEnabled -boolean false

Faster than 2000Hz / TCP takes too long

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