Feeds

Windows 7's dirty secrets revealed

Hidden work arounds and complex dependencies

  • alert
  • submit to reddit

The essential guide to IT transformation

PDC While chief technology officer Ray Ozzie was away in the clouds at Microsoft's Professional Developer Conference, technical fellow Mark Russinovich got down and dirty with the true heart of Windows - the kernel.

He presented a two-hour session on changes made to the kernel used by both Windows 7 and Server 2008 R2, shedding light on some confusing issues - like the Windows version number, which he said "means nothing at all". Windows 7 is version 6.1, not because it is a minor release, but for compatibility with applications that check the major number and would not run if it said 7.

Another of his themes was MinWin, a lightweight version of Windows whose purpose has sparked speculation. MinWin exists, he said, and contains the minimum necessary to boot and access the network: kernel, file system driver, device drivers, services and TCP/IP stack. It amounts to around 150 binaries, and requires 25MB disk space and 40MB RAM.

MinWin is handy for setup and system recovery, but its real purpose is to introduce what he calls "architectural layering" to Windows. Microsoft needs small footprint versions of Windows, both for embedded use and for the GUI-free Server Core edition. The problem is that the operating system is full of internal dependencies, and as Russinovich admitted: "We don't really understand those dependencies".

Engineers have added features to low-level APIs that assume the presence of dynamic link libraries (DLLs) that belong with higher level APIs, and when you try to extract just those low-level components, they break. MinWin is a first step in making Windows layered, maintainable and understandable.

A fresh DLL hell

In order to make MinWin, Microsoft had to split existing DLLs that had these unwanted dependencies, such as Kernel32.dll. The team created KernelBase.dll, which has only the base functions MinWin requires. Applications expect to find these functions in Kernel32, but they are simply forwarded to KernelBase. Kernel32 itself is outside MinWin.

A related problem is that Microsoft has been in the habit of combining unrelated APIs into the same DLL for performance reasons. Its solution is to create virtual DLLs, which are the API sets programmers call, but which are implemented in logical DLLs that might combine several virtual ones. A schema file that is mapped into every process tells Windows where the real API resides.

Russinovich went on to explain why Windows 7 is faster. Memory footprint was reduced by up to 30 per cent by reviewing excessive memory allocations, and by refactoring the Desktop Window Manager (DWM) to avoid a second copy of every Window being held in memory. The registry is no longer accessed as a memory-mapped file, reverting a change made for Windows XP. Processes that consume large amounts of memory are more aggressively pruned. Microsoft also picked out 300 common user actions, such as clicking the Start menu or opening Control Panel, and gave them intensive optimisation to improve perceived performance.

Next gen security for virtualised datacentres

Next page: Reliability?

More from The Register

next story
BBC: We're going to slip CODING into kids' TV
Pureed-carrot-in-ice cream C++ surprise
China: You, Microsoft. Office-Windows 'compatibility'. You have 20 days to explain
Told to cough up more details as antitrust probe goes deeper
Linux turns 23 and Linus Torvalds celebrates as only he can
No, not with swearing, but by controlling the release cycle
Scratched PC-dispatch patch patched, hatched in batch rematch
Windows security update fixed after triggering blue screens (and screams) of death
Windows 7 settles as Windows XP use finally starts to slip … a bit
And at the back of the field, Windows 8.1 is sprinting away from Windows 8
This is how I set about making a fortune with my own startup
Would you leave your well-paid job to chase your dream?
prev story

Whitepapers

Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Endpoint data privacy in the cloud is easier than you think
Innovations in encryption and storage resolve issues of data privacy and key requirements for companies to look for in a solution.
Why cloud backup?
Combining the latest advancements in disk-based backup with secure, integrated, cloud technologies offer organizations fast and assured recovery of their critical enterprise data.
Consolidation: The Foundation for IT Business Transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?