![]() There is one DPC queue per CPU available in the system. The operating system maintains DPCs scheduled by device drivers in a queue. Any data transfer performed by the device driver takes place in the context of this callback routine, named DPC for short. 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. A device driver cannot process data immediately in its interrupt routine. In Windows NT based systems (Windows 2000 and better) there is a specific interrupt handling mechanism. Typically, the external hardware periodically issues interrupts to request the driver to transfer the next block of data. Data processing in such device drivers is interrupt-driven. There is no guarantee that certain (periodic) actions can be executed in a timely manner.Īudio or video data streams transferred from or to an external device are typically handled by a kernel-mode device driver. This is because by design Windows is not a real-time operating system. Processing of streaming data in real-time is a very challenging task for Windows based applications and device drivers. In short, I found, the reason why this happens is because of the exceptionally high DPC latency. I decided to investigate this more closely. On top of this, I think that there is significant reduction of the MacBook battery run time as well (comparing to OSX). This was even more audible when I was listening streamed radio stations over shoutcast network. So I managed to easily upgrade mine to 500GB 5400rpm Hitachi laptop drive.Īfter playing with MacBook for a while on Vista, I noticed that when playing music, frequently there are audible clicks and audio skipping. The thing that I found is that this is the only laptop that can fit new 500GB SATA laptop drives which are thicker (12.5mm) than standard 250GB laptop drive (9.5mm). One nice thing is that at the back Apple gave us easy access to the hard drive on the back. Here is MacBook's performance index in Vista:Īs you can see, the overall rating is pretty high and the graphics card has pretty high rating (5.4) as well. ![]() I decided to have dual boot OS and installed Vista and Apple's BootCamp. This is an amazing looking laptop, and is one of the fastest performing laptops out there. (aluminum unibody model) This is an amazing looking laptop, and is one of the fastest performing laptops out there. Last week I got the latest Apple's 13.3" MacBook Rev. F Audio Skipping in Vista Analisys and Solution - Part 1
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