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dave
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reply to trparky

Re: [WIN7] Recommended SSD System Tweaks?

said by trparky:

Hell, even the mouse starts to seem like it's asleep at the wheel in the sense that if you move the mouse the cursor doesn't always respond.

Doesn't sound like any sort of a disk issue.

I'd look at CPU load, particularly for interrupt and DPCs (use Performance Monitor.


trparky
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Yeah, I've looked at that too. Very low CPU usage, most of the time it's less than 25% usage across all eight "CPUs".

I know that this machine has DPC Latency issues and I have another thread open in this same forums regarding the issue.

»[WIN7] High DPC Latency with High Network Traffic

But now it seems like it doesn't even need network traffic to have DPC Latency shoot through the roof. NDIS, TCP/IP, and some driver for the nVidia video card seems to be the biggest culprits according to LatencyMon. But, after looking at the other machines in my house with LatencyMon they too have the same latency spikes but they don't seem to be having the same issues that this desktop has.

I'm at a complete loss as to what could be causing these issues. Like I said, I've been troubleshooting this issue for almost two weeks now and I'm no closer to a solution or a reason why this is happening than I was when I started investigating this mess.

Could I be looking at potential hardware failure here? Motherboard? CPU?
--
Tom
Boycott AT&T uVerse! | Tom's Android Blog | AOKP (The Android Open Kang Project)


trparky
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I'm looking at the Performance Monitor and Interrupts per Second are damn near at the top of the graph in Performance Monitor.


trparky
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It seems that Flash may be connected to the high DPCs and Interrupt Requests per second. That and a dirty video card.


DKS
Damn Kidney Stones
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Owen Sound, ON
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said by trparky:

That and a dirty video card.

There are a whole bunch of straight lines that leads to...
--
Need-based health care not greed-based health care.


trparky
Android... get back here
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I really need to clean the machine out, dust everywhere. I did clean the video card out and with the first pull of the trigger on the can of compressed air and large cloud of dust came out. I need to do the same to the CPU as well since I can see a layer of dust on one of the heat fin assemblies.

I still say that Flash is awful pig that needs to be put down.
--
Tom
Boycott AT&T uVerse! | Tom's Android Blog | AOKP (The Android Open Kang Project)


trparky
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The processing latency issue comes and goes. I can't seem to find a connection between the issues.

As of right now, Interrupts per Second according to Performance Monitor is nearly 10 Million but it's not effecting the performance of the machine. It's as fast as it should be.

It could be fine for several hours and then suddenly start running horribly. I can't seem to find a reason for the issues that I'm having.
--
Tom
Boycott AT&T uVerse! | Tom's Android Blog | AOKP (The Android Open Kang Project)

dave
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10 million interrupts per second seems like a hell of a lot. If it takes of the order of a few hundred instructions to service an interrupt, that's more than one CPU core's worth.

Are you sure you read that right?

My admittedly fairly idle system is taking around 6 or 7 hundred interrupts/sec.


trparky
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said by dave:

10 million interrupts per second seems like a hell of a lot. If it takes of the order of a few hundred instructions to service an interrupt, that's more than one CPU core's worth.

Yes, that's across all eight "cores" of the Core i7 CPU.
--
Tom
Boycott AT&T uVerse! | Tom's Android Blog | AOKP (The Android Open Kang Project)

dave
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But my point is that consuming one whole core just for interrupt handling is not normal.

Unless you're servicing a lot of non-DMA devices. (Are USB devices DMA? Dunno)


trparky
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I only have a Logitech Keyboard & Mouse receiver (one USB device services them both) and a Logitech web cam. Only two USB devices are plugged into the machine at any one time. It's rare, but sometimes I connect my Android phone to the computer but usually only for short periods of time and I disconnect it when I'm finished.

LatencyMon says that some nVidia driver along with the NDIS, TCP/IP, and USBPORT driver are also part of the problem but it changes depending upon the state of the machine. As you can guess, tracking down which driver is causing this issue has been rather difficult.
--
Tom
Boycott AT&T uVerse! | Tom's Android Blog | AOKP (The Android Open Kang Project)


trparky
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I can't help but to think that somewhere in this system of mine, hardware is failing and that this is a sign of the beginning of the end for it.


trparky
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Damn it, I solved the problem. Too bad I had to use the "sledge hammer" method to do so. I reformatted my machine and reinstalled from scratch. Guess what? No issues. No DPC Latency spikes according to DPC Latency Checker v1.3.
--
Tom
Boycott AT&T uVerse! | Tom's Android Blog | AOKP (The Android Open Kang Project)

dave
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Just for comparison, what's the interrupt rate now?


trparky
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Click for full size
Interrupts
Screenshot.