Hi, I have tried on my Windows 7, the mount is successful, and the folders on NFS showed up. However, if I click any of the folders, the system will just keep trying. Thesis work Master thesis: Mirror: SCS - Master of Science theses (1.4 mb) Final presentation: (26.6 mb, includes embedded wmv videos) Experiment. Software, Hardware & Other Hacks. In my previous post I talked about reducing the DPC latency in order to prevent frequent audible clicks and audio skipping.
Alex. P's Weblog | Software, Hardware & Other Hacks…Last week I got the latest Apple’s 1. Mac. Book Rev. F.
This is an amazing looking laptop, and is one of the fastest performing laptops out there. I decided to have dual boot OS and installed Vista and Apple’s Boot. Camp. Here is Mac. Book’s performance index in Vista: As you can see, the overall rating is pretty high and the graphics card has pretty high rating (5. One nice thing is that at the back Apple gave us easy access to the hard drive on the back.
The NUI Group has been working hard to bring the PS3 Eye to windows. From the factory, this device has pretty impressive specs, but no windows drivers. International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research.. The Bespoke Multi-Touch Framework is a feature-rich and extensible software framework for developing multi-touch interfaces. Licensed under the BSD License, you are. Ein interaktives DIY-Whiteboard auf IR-Basis für 50 Euro. Diese pfiffige Alternative verwendet die Infrarotkamera der Wii-Remote™-Fernbedienung zur.
This makes a very easy upgrade. The thing that I found is that this is the only laptop that can fit new 5.
GB SATA laptop drives which are thicker (1. GB laptop drive (9. So I managed to easily upgrade mine to 5. GB 5. 40. 0rpm Hitachi laptop drive.
The Problem. After playing with Mac. Book for a while on Vista, I noticed that when playing music, frequently there are audible clicks and audio skipping. This was even more audible when I was listening streamed radio stations over shoutcast network.
On top of this, I think that there is significant reduction of the Mac. Book battery run time as well (comparing to OSX). I decided to investigate this more closely. In short, I found, the reason why this happens is because of the exceptionally high DPC latency.
Why Audio Drop- outs Occur?(Taken from http: //www. Processing of streaming data in real- time is a very challenging task for Windows based applications and device drivers. This is because by design Windows is not a real- time operating system. There is no guarantee that certain (periodic) actions can be executed in a timely manner. Audio or video data streams transferred from or to an external device are typically handled by a kernel- mode device driver.
Data processing in such device drivers is interrupt- driven. Typically, the external hardware periodically issues interrupts to request the driver to transfer the next block of data.
In Windows NT based systems (Windows 2. A device driver cannot process data immediately in its interrupt routine.
It has to schedule a Deferred Procedure Call (DPC) which basically is a callback routine that will be called by the operating system as soon as possible. Any data transfer performed by the device driver takes place in the context of this callback routine, named DPC for short.
The operating system maintains DPCs scheduled by device drivers in a queue. There is one DPC queue per CPU available in the system. At certain points the kernel checks the DPC queue and if no interrupt is to be processed and no DPC is currently running the first DPC will be un- queued and executed. DPC queue processing happens before the dispatcher selects a thread and assigns the CPU to it.
So, a Deferred Procedure Call has a higher priority than any thread in the system. Note that the Deferred Procedure Call concept exists in kernel mode only. Any user- mode code (Windows applications) runs in the context of a thread. Threads are managed and scheduled for execution by the dispatcher. While there is a pre- emptive multitasking for threads, DPCs are executed sequentially according to the first in, first out nature of a DPC queue.
Thus, a sort of cooperative multitasking scheme exists for Deferred Procedure Calls. If any DPC runs for an excessive amount of time then other DPCs will be delayed by that amount of time. Consequently, the latency of a particular DPC is defined as the sum of the execution time of all DPCs queued in front of that DPC. In order to achieve reasonable DPC latencies, in the Windows Device Driver Kit (DDK) documentation Microsoft recommends to return from a DPC routine as quick as possible. Any lengthy operation and specifically loops that wait for a hardware state change (polling) are strongly discouraged. Unfortunately, many existing device drivers do not conform to this advice. Such drivers spend an excessive amount of time in their DPC routines, causing an exceptional large latency for any other driver’s DPCs.
For a device driver that handles data streams in real- time it is crucial that a DPC scheduled from its interrupt routine is executed before the hardware issues the next interrupt. If the DPC is delayed and runs after the next interrupt occurred, typically a hardware buffer overrun occurs and the flow of data is interrupted.
A drop- out occurs. The Solution. After running the DPC Latency Checker program, I found that the excessive DPC latency was indeed the cause of all the audio skipping. Here is the DPC Latency with my Mac. Book idling: At moments the latency was as high as 3. After running the Process Explorer program I was able to track down the program that was causing the problem. It was the Apple’s Kbd.
Mgr. exe. This program is responsible for managing the keyboard, handling the special keys and displaying the OSD (on- screen- display) when you, for example, change screen brightness. For a program that is mostly idle the Kbd. Mgr. exe consumes quite a lot of CPU cycles. You can see that Kbd. Mgr has eight threads, but only one of them constantly consumes high number of CPU cycles. After inspecting the API calls that thread (TID 1. I found that the main cause for the high CPU cycles is the bad Kbd. Mgr’s multiprocessor implementation (deadlock situation betwen CPU cores in User/Kernel mode).
In another words, by simply limiting Kbd. Mgr to a CPU core #1 (CPU affinity) and optionally setting Kdb. Mgr’s priority to Idle, the DPC latency of my Mac. Book improved dramatically: As you can see the latency went from whopping high 3. The result was smooth audio playback with no skipping, much more responsive machine and improved laptop’s battery life. Here is the fix: Kbd.
Mgr. rar. The new fixed version will automatically run on CPU #1 with low priority and will reduce the DPC latency of Mac. Book. Installation: 1.
Go to Task Manager and kill Kbd. Mgr. exe process. Download and extract the contents of the Kbd. Mgr. rar file to a temporary directory. Backup the original Kbd. Mgr. exe file located in C: \Program Files\Boot Camp directory.
Copy new Kbd. Mgr. C: \Program Files\Boot Camp directory. Restart your machine. Posted in Mac. Book Hacks.