OS and Software > Microsoft Help > [WIN7] Recommended SSD System Tweaks?

reply to trparky

Re: [WIN7] Recommended SSD System Tweaks?

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)

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

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

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)

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)

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.

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)

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)

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.

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)

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

reply to trparky
I was reading through the FAQ's on the Intel site yesterday while downloading the firmware update for some 40GB Intel SSDs. Poor performance is one of the times they do recommend a low-level format of the SSD. It may not fix your problem, but is possibly something to look at.

Ok, but here's the problem. It starts out fast, boots up fast, starts up apps fast, generally it's very fast. Then, as the system is used over time the machine gradually slows down to where apps take forever to load relative to how it is when the system first boots. To fix this I'd reboot, reboot and everything gets zippy again. But, wait a couple of hours and it's slow-mo again.

I'm at my wits end here. There is no reason on God's green Earth that a machine of this caliber should be slowing down like this. There just isn't any call for it.
--
Tom
Boycott AT&T uVerse! | Tom's Android Blog | AOKP (The Android Open Kang Project)

If I had a bad SSD, a reboot wouldn't magically solve the issue. It would be slow-mo all the time, not just after awhile of being up without a reboot.

Besides, I have another computer that's also a Core i7 and it's only processing about 2,000 Interrupts/seconds whereas my machine processing nearly 10,000!