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Recent content by rob18767

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Xperf, Windows Performance Analyzer and Symbols

Hi On a Windows 10 IoT Enterprise (Build 1809) I managed to get an .etl file using xperf. Great. However... When I open Windows Performance Analyzer I am told to open the .etl file, which it does. I then am told to select File > Configure Symbols. Which does not exit. The load...
- rob18767
- Thread
- Jul 22, 2020
- Replies: 0
- Forum: Windows 10
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User space code and not getting read requests fast enough.

That does not help. Its seems that another process is starving our process of its IRQL time that it requires.
- rob18767
- Post #6
- Jul 16, 2020
- Forum: Windows 10
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User space code and not getting read requests fast enough.

I think xperf could be a solution to my problem... potentially Is there anyway to get xperf to trace only after user space application throws an exception? The user space application takes many hours to crash and xperf -on interrupt+dpc will make a ridiculously large file.
- rob18767
- Post #4
- Jul 16, 2020
- Forum: Windows 10
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User space code and not getting read requests fast enough.

This is a user space issue. The driver is working fine. The user space application cannot provide read requests fast enough to the driver.
- rob18767
- Post #3
- Jul 16, 2020
- Forum: Windows 10
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User space code and not getting read requests fast enough.

I have a piece of PCIe hardware, that I designed, running on an FPGA. The FPGA has 2 ping pong buffers and interrupts every 80ms after filling up one buffer, which tells Windows to go away and process this data (KMDF driver), while this is being processed the other buffer starts to fill to be...
- rob18767
- Thread
- Jul 13, 2020
- Replies: 5
- Forum: Windows 10
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The good 'ol latency issues

Sometimes you run Latency Monitor for quite a bit of time and comeback and you see a huge spike in activity. In the report section of Latency Monitor does it give a timestamp for the maximum times of DPC execution? You could try running it in conjunction with Process Monitor - Windows...
- rob18767
- Post #10
- Jul 8, 2020
- Forum: Windows 10
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The good 'ol latency issues

Why would removing a soundcard and its drivers affect ndis.sys? Something else going on.
- rob18767
- Post #8
- Jul 8, 2020
- Forum: Windows 10
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The good 'ol latency issues

15ms in the DPC is ridiculous for ndis.sys. What on earth are they doing in there? Have they not heard of Work Items? When your kernel mode driver makes an IO request read or write first of all the Interrupt fires to say that it has DMA'd a buffer. The ISR should only set/clear registers and...
- rob18767
- Post #6
- Jul 8, 2020
- Forum: Windows 10
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The good 'ol latency issues

Can you increase the buffer size on your audio card? For some reason I cannot extract your System Info file.
- rob18767
- Post #4
- Jul 8, 2020
- Forum: Windows 10
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Hello. Engineer here.

As an embedded engineer, as part of my job I design embedded Windows 10 IoT products. I write in kernel (driver) mode and user mode. I also design PCIe hardware. However..... My biggest problem is I often run into more general problems with Windows that I believe that people here could...
- rob18767
- Thread
- Jul 2, 2020
- Replies: 6
- Forum: Introductions - New Members

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