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Difference in the test Result done on two different Load-Generator

Hello,

I have two Load-Generator server.

  1. Windows 7, RAM- 8GB, 64-bit Operating System
  2. Windows 10, RAM- 16GB, 64-bit Operating System 

I did a test on Load Generator –windows 7 and the same test on Load Generator –windows 10.

However, the result on windows 7 was much faster than the result on Windows 10.

(Script, scenario, Vusers are same for both the test). 

Could anyone tell why it is so and how to fix it? 

Thanks

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Re: Difference in the test Result done on two different Load-Generator

Hi,

Which protocol? which LoadRunner version?

Did you ensure that the same run time settings were applied? 

What is the throughput/hit per second/transaction per second/bandwidth on each of the Load Generators?

Regards,

Shlomi

 

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Re: Difference in the test Result done on two different Load-Generator

Next to Shlomi remarks check the power settings on both CPUs Both in BIOS and operating system. Have both systems the same security patch level (anti Meltdown/Spectre patches)?

Are both systems physical systems or are the virtualised.

Did you register the performance counters of both LG during your test what are the differences?

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Re: Difference in the test Result done on two different Load-Generator

Hi,

I am using TruClient, Loadrunner 12.53 Patch-4.

Runtime setting is same for both the test. 

Load generator with windows 7Win 7.JPG

Load generator with windows 10

Win 10.JPG

Thanks

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Re: Difference in the test Result done on two different Load-Generator

Thanks for sharing the details. Strange indeed, there must be another factor that causes the slowness on Windows 10 machine. 

Which browser do you use? and which build of Windows 10? If you are using TC IE, can you try the same compairson with TC Firefox or TC Chromium?

Regards,

Shlomi

 

 

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Re: Difference in the test Result done on two different Load-Generator

Hi,

I am using TC IE.

However, I did one Test with TC Firefox on win 7 and win 10. (Same script, scenario and Vusers)

Win 10 Build:

win10_version.JPG

Test Result on Win 7.

Mozilla_win7.JPG

Test Result on Win 10

Mozilla_win10.JPG

Thanks 

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Re: Difference in the test Result done on two different Load-Generator

Hi,

Please open a support call. It requires closer look on the Windows 10 machine. 

Regards,

Shlomi

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Re: Difference in the test Result done on two different Load-Generator

Hi Skumar,

From my understanding it seems Win10 has some additional overhead in its networking, or other conflicting optimizations, due to some functionality of the newer OS different from Win 7, and we should pinpoint through trial which functionality that is.

 

Please provide the following details to better pinpoint the issue:

  • Resource consumption on the LG when the script is running (network, RAM) - from task manager
  • Slow network and high TRT might be due to a slower proxy? Is the proxy connectivity the same, and configured the same?
  • Please make sure Win10 is up-to-date.
  • How does this perform with a Chromium script? Does it replicate the slow results?
  • Is it possible to test it on a newer version of TC to see if they are related?
  • Is this problem replicatable on other Win 10 LG's? How many Win10 LG's are experiencing this issue?

 

For ideas, here are some things you can check that are Win10 specific:

  1. Close the Peer to Peer Update Process on Your Computer

    Step 1:  To start off, Click Start and then go ahead type Settings to open it.

    Step 2:  Next select Update and Security

    Slow Internet on Windows 10

    Step 3:  Now click on Advanced Options

    Slow Internet on Windows 10

    Step 4:  You’re almost there! Click on Choose How Updates are Delivered.

    Slow Internet on Windows 10

     

     

     

    Step 5:  Finally, go ahead and turn off the On button.

     

    Slow Internet on Windows 10

  2. Quit your background apps

    Step 1:  Start off by right-clicking the Windows Taskbar. Open Task Manager. (You can also search on your computer or ask cortana on Windows 10)

    Step 2: Once you’re in your Task Manager’s menu, click on the Performance tab.

    Slow Internet on Windows 10

    Step 3:  Now click on Open Resource Monitor from the bottom part of the window.

    Slow Internet on Windows 10

    Step 4:  Lastly, click on the Network tab and check for all your apps or services that have a high number of send and receive requests.

    The way it works is, the higher the number, then it shows that these apps or services are taking a chunk  of your internet bandwidth.

     

    Slow Internet on Windows 10

     

    Quitting your Apps

    Since now you have an idea or sort of which of the apps or services that takes up most of your internet, you can now get onto disabling them.

    Here’s how you can do that in just two little steps. 

    Step 1:  Click on Start and then select your Settings

    Step 2:  Next click on Privacy, and then Background apps. Here’s where you can turn Off for the apps and services that feed off your internet.

     

    Slow Internet on Windows 10

  3. Disable Windows 10 Auto-Tuning Feature

    Step 1:  Go ahead and press on your keyboard Windows key + X and then select Command Prompt(Admin).

    Step 2:  Next, type the command netsh interface tcp show global in the window.

    Step 3:  Now you are going to check for Receive Window Auto-Tuning Level and if you find that it is set to normal, then you will need to disable it.

    Slow Internet on Windows 10

    Step 4:  Finally, again type another command netsh int tcp set global autotuninglevel=disabled to disable it.

    Slow Internet on Windows 10

  4. Disable Windows 10 Large Send Offload (LSO)

    Step 1:  Go ahead and open Start and then right-click on your Computer

    Step 2:  Next, select Properties

    Slow Internet on Windows 10

    Step 3:  Now from your Control Panel, click on Device Manager 

    Step 4:  Here you will be able to see all your devices listed, but for now you will only need to expand your Network Adapters.

    Step 5:  Next, look for your Network Card and then double click on that.

    Slow Internet on Windows 10

    Step 6:  You’re almost there! Now select the Advanced tab and then go ahead and select Large Send Offload V2 (IPv4).

    All you have to do here is set the value to Disabled.

    Slow Internet on Windows 10

    Step 7:  Do the exact same that you just did for Large Send Offload V2 (IPv6) (that is if, it is available).

    Step 8:  Click OK and you’re done!

  5. Adjust the Internet Bandwidth Settings

    Step 1:  Go ahead and get the Run window up by clicking on Windows key+R key on your keyboard. (You can also search for it on your computer)

    Step 2:  Type gpedit.msc in the search box and then press OK.

    Slow Internet on Windows 10

    Step 3:  Alright! Now you will find that the Group Policy window will come up, so what you have to do here is just click on Computer Configuration

    Slow Internet on Windows 10

    Step 4:  Next go to Administrative Templates, then Network, and lastly QoS Packet Scheduler.Once you’re here click on Limit reservable bandwidth

    Slow Internet on Windows 10

    Step 5:  Now in the new window that comes up, all you have to do is just two things. First choose Enabled and then change the Bandwidth limit (%) from 100 to 0. 

    Slow Internet on Windows 10

    Step 6:  Make sure that you Apply these new changes that you just made and then click on OK.

 

Hope this helps. Let us know if any of these leads prove to possitively affect the transaction stats.

 

All the best,

Lup.

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