High processor load on i7 (Skylake) with many threads on .net application

[BBirg]

Hi,

We have a problem with the new Skylake processors when running our application.

The application is developed on c# .net platform and is easily using using 600-800 threads when running. We currently use 3770 processors on our machines and it works well.

Looking for an upgrade we started a test with 6700. This has not gone well at all. We see significantly higher CPU load. The strange thing is that if we turn of hyperthreading the CPU load drops significantly. In one test from 85% to about 45%.

Could this be related to the bug referred here: http://www.pcworld.com/article/3021023/hardware/how-to-test-your-pc-for-the-skylake-bug.html How to test your PC for the Skylake bug | PCWorld ?

Or is this by design and hyperthreading is not suitable for this type of load and we need to move away from CPUs with hyperthreading?

Any advice would be highly appreciated

Kind regards / Birger

[AHahn2]

HI,

i have a similar problem on i7-6820HQ and i7-6920HQ.

My Process takes on older Systems (i7 4th Gen, 2nd Gen, Core 2 Quad) 0-2%. On our new systems it takes >10% with peaks up to 100% what results in hard laggy mouse and unaffected system.

Turning off Hyperthreading solves the peaks and high cpu usage for me at the moment. Is there any other maybe better solution?

Are there any experiances if the behavior under other operating systems is different than Windows 7.

Regards,

Andy

[idata]

Hello hahn,

Thank you for joining the thread.

For us to further assist you and to help you with the specific problem, please create a new thread, make sure to add all the details in regard to your system. This way the next agent will have a better look at your specific scenario, you can add this thread as a reference but I recommend creating a new thread in order to isolate your case.

Regards,

Amy.