Improve this question. Feo Feo 6 6 bronze badges. Why are you fiddling with ACLs in kernel mode? Describe your scenario please — Ana Betts. It's a long story If you mount the network volume under Windows XP and format it, then do not add permissions to the group "Authenticated Users".
If the volume is then mounted under Windows 7, it prohibits any write operation to these discs. Due to the current architecture of the program, improve the rights from kernel mode is the easiest way. The behaviour you describe seems odd.
Post by mrpijey » Mon Sep 26, pm. Privacy Terms. The community for beta and abandonware collectors. Quick links. You'd be better off upgrading to something newer 7 or newer, vista will lose support next year. DLL is not the entire kernel, it's also ntoskrnl. Last edited by ovctvct on Mon Sep 05, pm, edited 3 times in total. Windows XP Very fast system not like those windows 7 up systems.
But, it is not easy. Dlls like comctl32, ntdll are hard to make a wrapper. Windows OS. Re: Enhancing XP kernel to bring modern apps running Post by sparcdr » Fri Sep 02, pm The problem is complicated by lack of source code, or the inability to use source code due to clean-room implementation requirements stemming from a legal grey area in both cases of ReactOS and binary wrappers. In the case of either, choosing which apis has to be done often per application and that's why there's a WineHQ compatibility database with Gold, Silver and Bronze monikers.
Followed by in no particular order the mentioned interdependencies, in the case of this topic a completely binary matter due to the standard "no modification or derivatives" EULA. Re: Enhancing XP kernel to bring modern apps running Post by Svyatpro » Wed Sep 07, am I can easily forward any export function in any system dll to a one from a wrapper dll.
But I don't have a good wrapper dlls like kernel32 and ntdll. Samuka did some wrappers like kernelex and vtdll, but not all functions works well. Who can write NT6 wrapper dlls?? Re: Enhancing XP kernel to bring modern apps running Post by jimmsta » Fri Sep 09, pm Some useful knowledge follows: ntoskrnl and all its variants are pure NT-mode code.
Applications do not see or talk directly to this layer. If your account doesn't depend on a roaming profile, and a domain policy that affects logon hasn't changed since your last logon, Winlogon doesn't wait on the workstation service which waits on networking services to start before presenting the logon dialog and allowing a user to log on.
This means disconnected laptop users with domain accounts won't be held up during logon as their system times out to look for a domain controller. The implementation of hibernation has been revamped for better performance. When the operating system hibernates, it informs device drivers to stop operations on their devices. When the computer resumes, the operating system loader reads the contents of the hibernation file into memory and tells device drivers to restart their devices, after which the computer is back to the state it was in before the power-off.
The hibernation improvements come in several areas. The Power Manager compression algorithm, which it uses to compress the contents of memory before writing it to disk, has been improved to both run faster and obtain better compression ratios than in Windows Other changes help resume-from-standby and hibernation performance.
For example, the resume code in NTLDR, the component that reads a hibernation file's contents into memory, has been streamlined to perform larger, more sequential reads. When a system is running on battery DC power , the Power Manager automatically adjusts the processor's clock rate to accommodate the processing demands of applications, throttling back the speed during idle periods to save power.
All versions of Windows except real-mode Windows 3x are demand-paged operating systems, where file data and code is faulted into memory from disk as an application attempts to access it. Data and code is faulted in page-granular chunks where a page's size is dictated by the CPU's memory management hardware. A page is 4KB on the x Prefetching is the process of bringing data and code pages into memory from disk before it's demanded.
In order to know what it should prefetch, the Windows XP Cache Manager monitors the page faults, both those that require that data be read from disk hard faults and those that simply require that data already in memory be added to a process's working set soft faults , that occur during the boot process and application startup. By default it traces through the first two minutes of the boot process, 60 seconds following the time when all Win32 services have finished initializing, or 30 seconds following the start of the user's shell typically Microsoft Internet Explorer , whichever of these three events occurs first.
The Cache Manager also monitors the first 10 seconds of application startup. After collecting a trace that's organized into faults taken on the NTFS Master File Table MFT metadata file if the application accesses files or directories on NTFS volumes , the files referenced, and the directories referenced, it notifies the prefetch component of the Task Scheduler by signaling a named event object.
The Task Scheduler then performs a call to the internal NtQuerySystemInformation system call requesting the trace data. The file's name is the name of the application to which the trace applies followed by a dash and the hexadecimal representation of a hash of the file's path. The file has a. Only after the Cache Manager has finished the boot trace the time of which was defined earlier does it collect page fault information for specific applications. When the system boots or an application starts, the Cache Manager is called to give it an opportunity to perform prefetching.
The Cache Manager looks in the prefetch directory to see if a trace file exists for the prefetch scenario in question. If it does, the Cache Manager calls NTFS to prefetch any MFT metadata file references, reads in the contents of each of the directories referenced, and finally opens each file referenced.
It then calls the Memory Manager to read in any data and code specified in the trace that's not already in memory. The Memory Manager initiates all of the reads asynchronously and then waits for them to complete before letting an application's startup continue. How does this scheme provide a performance benefit? The answer lies in the fact that during typical system boot or application startup, the order of faults is such that some pages are brought in from one part of a file, then from another part of the same file, then pages are read from a different file, then perhaps from a directory, and so on.
This jumping around results in moving the heads around on the disk. Microsoft has learned through analysis that this slows boot and application startup times. By prefetching data from a file or directory all at once before accessing another one, this scattered seeking for data on the disk is greatly reduced or eliminated, thus improving the overall time for system and application startup.
Figure 1 shows the contents of a prefetch directory, highlighting the layout file. Then it launches the system defragmenter with a command-line option that tells the defragmenter to defragment based on the contents of the file instead of performing a full defrag.
The defragmenter finds a contiguous area on each volume large enough to hold all the listed files and directories that reside on that volume and then moves them in their entirety into that area so that they are stored one after the other.
Thus, future prefetch operations will even be more efficient because all the data to be read in is now stored physically on the disk in the order it will be read.
Since the number of files defragmented for prefetching is usually only in the hundreds, this defragmentation is much faster than full defragmentations. It runs on the new Intel Itanium processor at one time internal builds of Windows were running in native bit mode on the Compaq Alpha AXP processor, but this was never released. To port Windows XP to Itanium was a major development effort. First, the architecture-specific code in the kernel, memory manager, and HAL had to be written from scratch.
This includes support for trap dispatching, context switching, and the new three-level page table structure. Then, thousands of changes were required to get the millions of lines of code that comprise Windows XP to compile and run properly using the native bit compiler and data types. However, the end result is a system that feels like its bit counterpart.
In fact, there are virtually no visible differences to the user or administrator other than text on the system properties page and various system display utilities that report processor type, and the fact that the new Visual Styles, like the Luna theme, are not supported on bit Windows; only classic-style Windows is supported.
The most significant change is, of course, the fact that the virtual address space is huge compared to bit Windows. While 32 bits provides 4GB of address space, 64 bits means over 17 billion GB 16 exabytes of available address space. However, the way this address space is divided and laid out is quite different. Whereas bit Windows divides the address space in half—2GB for user processes and 2GB for system space—bit Windows provides GB to each user process.
Figure 2 bit Address Space Layout This larger virtual address space means applications can process vast amounts of data in a flat address space without resorting to mapping tricks like the AWE introduced in Windows that allow bit applications to utilize more than 2GB of memory. Also, since the address space for the operating system is much larger, key system memory pools can be much larger now.
This translates to the ability for the system to run more and bigger programs, load more and bigger device drivers, and cache more data. These larger limits are detailed in Figure 3. Itanium runs firmware that's compliant with the new Extensible Firmware Interface EFI , a specification that is maintained by a consortium of companies. For example, all disk offsets in the partition table are bit instead of bit quantities, and the partition table information is mirrored at the start and end of a disk.
Furthermore, there's no nesting of partitions as is required in MBR partitioning when there are more than four partitions on a disk. Just as with the bit version of the OS, the bit edition can be configured to make the Logical Disk Manager LDM service manage a disk's partition so that you can define multipartition volumes volume sets, RAID-5, and so on.
LDM preserves the original partitioning scheme MBR or GPT , but internally manages all the space on a disk not included in the boot partition or the partition table information, thereby creating soft partitions as opposed to hard partitions defined by the disks main partitioning format.
Interestingly, the Compaq Alpha processor's firmware was programmed to understand the relatively simple FAT file system format, which meant that at least one partition on the Alpha boot disk had to be formatted as FAT. Windows was already a reliable platform. Windows XP builds on that foundation by adding a number of significant recovery capabilities and reliability improvements such as System Restore, Driver Rollback, Volume Shadow Copy, a more reliable service infrastructure, and new Driver Verifier options.
We'll describe these options in detail. System Restore, which originally appeared in a more rudimentary form in Windows Me, provides a way to restore the system to a previously known state that would otherwise require you to reinstall an application or even the entire operating system. For example, if you install one or more applications or make other system file or registry changes that cause applications to fail, you can use System Restore to revert the system files and the Registry to the state it had before the change occurred.
System Restore is especially useful when you install an application that makes changes that you would like to undo. Setup applications that are compatible with Windows XP integrate with System Restore to create a restore point before an installation begins.
The service's role is to both automatically create restore points and to export an API so that other applications—such as setup programs—can manually initiate restore point creation. By default, the service creates a restore point every 24 hours while the system is up, and when the system is off or running on batteries when automated restore points creation is disabled , it tries to ensure that the latest restore point is no older than 24 hours.
The restore directory contains restore-point subdirectories having names in the form RPn, where n is a restore point's unique identifier. It is not often enough appreciated enough that although Windows XP and Windows Server were largely contemporaneous, they were significantly different. At least as much under-appreciated is that although Windows Vista and Windows Server were marketed as very different, being for use as client and server respectively, their kernels are exactly one and the same.
Matters are even worse for Windows Server and Windows Server R2, for although their names sound alike, the kernel in the one is exactly that of a Windows Vista service pack but the kernel in the other is exactly that of Windows 7, so that they are in fact very, very different.
On the assumption that similar unification of client and server editions is intended forever, however much the correspondence is disguised in the names that Microsoft chooses for marketing, I do not keep downloading releases of the server products just to check the correspondence with client products. The version numbering gets indisputably quirky for Windows Vista, Windows 7, Windows 8 and Windows 8.
As if to acknowledge this as unsatisfactory, the major version number for Windows 10 leaps ahead to This, however, brings the different problem that its roughly half-yearly updates vary more from one to the next than did many service packs but all have the same major and minor version numbers. This multiplicity is even without the complication of free and checked builds.
The latter are offered by Microsoft as an aid to debugging and since they are explicitly not for real-world use they are all but ignored at this website. It applies only to bit x86 builds.
The point to having separate builds for PAE is that the memory manager is specialised to use bit or bit page table entries. This is not a choice that will change mid-flight and so the loaded kernel is better to have code for only one or the other, not both.
An installed system has either the single-processor kernels or the multi-processor kernels but not both. EXE as if for a single-processor system.
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