Windows 7: Release Candidate 1 Preview
by Ryan Smith and Gary Key on May 5, 2009 11:00 PM EST- Posted in
- Systems
Getting Dirty: What’s Changing Under the Hood
While Windows 7 is a refinement of Vista, this doesn’t preclude making some changes in the kernel and other related systems. Microsoft has opted to spend most of their efforts working on various graphics systems, so among the big changes there’s only a few items of note that don’t fall into the graphics category.
Likely the change with the most immediate impact is that Microsoft has reworked the subsystem responsible for TV tuners, the Broadcast Driver Architecture (BDA). The latest incarnation of BDA adds a full DRM chain, giving rise to the Protected Broadcast Driver Architecture (PBDA). PBDA solves the biggest issue Microsoft has had getting Windows computers accepted as TV viewers: the lack of a simple and effective DRM chain between the tuner and the computer. HDCP ensures that content is protected between the computer and the display, but there has been no standardized way to do the same with incoming content. As such the only services that allow Windows connectivity with protected content thus far have been cable systems using CableCARDs, all the while limiting this functionality to computers specially licensed by CableLabs.
PBDA protected data flow. Slide courtesy Microsoft
PBDA also resolves some lesser technical issues with BDA, such as how a device should communicate with Windows Media Center when it needs setup information that Windows Media Center can’t provide, and how to feed guide data to Windows Media Center (currently it pulls the data from Zap2It). Although this is open to all services, Microsoft’s primary example here is DirecTV, which would require all of these additions. DirecTV has been developing the HDPC-20 tuner for PCs but held it back for unnamed reasons. All indications are that the HDPC-20 will finally be a go due to PBDA (and the addition of H.264 decoding support helps, too).
The downside from all of this however is obvious: more DRM. We’re not fans of DRM, so we’re not enthused to see that yet more DRM is required before content distributors are willing to let Windows computers access their content. It’s very much making a deal with the Devil.
Next up, the Windows kernel has also seen some tweaking in preparation for ever-larger core counts on CPUs. Vista was tuned for up to 32 cores, but the dispatcher lock made scaling beyond that difficult as it causes threads to spend too much time waiting on the lock. The lock has been redesigned to better support more cores, pushing the new cap up to 256 cores. Bear in mind that currently a single Intel Nehalem quad-core processor effectively has eight cores due to Hyper-Threading, so it was possible to hit the 32 core limit on a 4P Nehalem system, directly creating a problem once Intel puts more cores into Nehalem’s successor. With the limit raised to 256 cores, Windows 7 should be well ahead of the CPUs again.
SSD users will be happy to know that Windows 7 has improved support for those devices. Although Windows 7 doesn’t have an SSD-optimized file system as first rumored, it is adding TRIM support. For more details on TRIM, please see our SSD Anthology article
Wrapping up the changes, Microsoft has also added native support for Wireless Wide Area Networks (WWAN), more commonly referred to as mobile broadband networks. Adapters for such networks were already usable on existing Vista and XP installations, but this brings the configuration of those devices into the OS rather than using 3rd party utilities, similar to how Windows took over WiFi management previously.
Further optimizations have also been made under the hood to help contain Windows’ resource usage and speed up its boot time. Microsoft hasn’t documented every single change they’ve made to make Windows less resource hungry, but there’s clearly a cumulative effort beyond just squeezing more out of the DWM and gadgets (more on this later). Meanwhile everything that makes Windows less resource hungry feeds into shaving seconds off how long it takes to boot Windows, which along with other changes is designed to help get Windows to consistently boot in under 30 seconds. Changes here include additional parallelism in driver initialization and chopping down the number of services that load with the system before they’re ever called. SuperFetch has also been slightly tweaked to improve the post-boot experience – it no longer starts caching things immediately after the user account loads, so that using a freshly booted computer isn’t quite so sluggish. In effect SuperFetch has been deprioritized some so that its loading is less noticeable to the user.
Vista SP1 Boot Times, Courtesy Microsoft
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strikeback03 - Thursday, May 7, 2009 - link
In some things I can understand moving stuff, but there are also some that were moved for no good reason. For example, in XP to get display properties, you right click the desktop and click properties. In Vista there is at least one additional page to click through to get that. Ultimately, it seems to me that MS tries too hard to hide the settings, likely to protect the users who don't know what they are doing, but a pain for the users who do. For the record, I had the same complaint about XP coming from win2000, that whenever you hop on a system that wasn't set to all the classic settings, it is a pain to get around.Jackattak - Thursday, May 7, 2009 - link
But Strikeback you're talking about probably 10% of the users (power users). The majority of Windows users don't give a crap about modification, and that's who they're "protecting" based on your explanation.If you were running Microsoft, wouldn't you find it a small issue that you were "inconveniencing" 10% of your user base by making them go "one page deeper" in order to "protect" 90% of your users?
strikeback03 - Friday, May 8, 2009 - link
Then do like the GPU companies do and have both simple and advanced versions of the interface. Allow them to change one setting to show or hide all the "advanced" stuff across the OS. And put it somewhere easy to find, like the start menu.mathew7 - Wednesday, May 6, 2009 - link
I'm also a XP-lover. Even in XP I'm using it with classic view (2K view).My main problem is removal of old start-menu (cascading menus). I really hate the Vista style-menu.
Also, I prefer UAC disabled and using run-as different user. Unfortunately (in Beta), explorer would not take the new permissions (launch in separate process was enabled for both users), which means configurations had to be done with admin logon. I have not tried this yet in RC. Also, once UAC was disabled, the UAC menu items (with the shield) were still present with no actions (again I don't know about RC).
On the other hand, the new taskbar (with previews) and the multimedia settings are good-enough reason for me to switch.
ssj4Gogeta - Wednesday, May 6, 2009 - link
Start menu is one of the best features that were introduced in Vista. It's great on a netbook or a small monitor. You also don't need to move your mouse, just type in the first few letters of the app name. It also searches your documents for you.And about that RAM issue, what did you expect? I'm surprised it even runs on 512MB. Even netbooks have at least a gig of RAM.
SirKronan - Wednesday, May 6, 2009 - link
I like the revamped start menu as well. Love instant search!But did they add Blu-ray support to Media Center? This has been one of my complaints from the beginning about Media Center. It has to launch a separate program to play Blu-rays & HD DVD's, and I haven't found any way around it short of ripping the movies to a hard disk. I realize there are anti-trust/competitive laws, and I honestly don't mind having to buy PowerDVD or WinDVD to get their decoder, but I want the movie to play back in MEDIA CENTER with all of the interface's great features, like the smooth playback and intuitive controls, guide information, zoom feature (get rid of black letterbox - with 1080p you certainly have enough resolution to scale a tad!), etc.
Have they added that yet? If not, PLEASE, Anand, ask them to for us!
KingViper - Wednesday, May 6, 2009 - link
Archsoft and the newest version of PowerDVD both have plugins for Media Center..from what I hear. Although Media Center itself isn't actually playing the Blu-Ray..it looks like it integrates well. You might try out the trial versions.chrnochime - Wednesday, May 6, 2009 - link
Just because netbooks have more ram(and not every one of them has 1G, some has 512MB), doesn't mean the OS should try to gobble up as much as is available. I don't get why every iteration of their OS just keep getting bigger and bigger, with little discernible improvements to the average user.and this? "Ultimately, with Microsoft throwing Windows 7 RC1 out to the masses, we can't think of a good reason not to try it."
Unless they have ways to export the settings in programs and whatever document users have when they were using W7, it'd be really hard to convince the average user to try out just for sake of novelty.
KingViper - Wednesday, May 6, 2009 - link
"I don't get why every iteration of their OS just keep getting bigger and bigger, with little discernible improvements to the average user. "Many things an OS is responsible for is not necessarily obvious to the average user. Compatibility with almost all hardware available, including keeping the OS as secure as possible. DX10\DX11 and h264 codecs etc. etc. etc. TONS of stuff is added, but it isn't necessarily used everyday. Of course it's going to get bigger.
I don't understand how XP users are about as bitter with Microsoft as Mac users are. Can you just not afford a Mac or what?
mathew7 - Wednesday, May 6, 2009 - link
I also would like to say about W7RC and low-RAM:Windows 7 on 512MB RAM (desktop Intel G45 MB w/laptop HDD) feels to me like XP din on a 64MB RAM laptop years ago. It's good for internet/light work, but even for that you need patience because of swapping.