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https://support.symantec.com/us/en/article.TECH244351.html
The memory is further divided in Low memory (or Normal memory), which is directly mapped to kernel's part of the address space and High memory, which has no direct kernel mapping. In other words: - The kernel itself (including its active modules, e.g. Check Point kernel modules) can only make use of LOW memory.
https://bbs.archlinux.org/viewtopic.php?id=47275
Apr 18, 2008 · Re: [HowTo] Enable High Memory support for kernel Well, you could call those easy steps, courtesy of ABS. Run abs, cd /var/abs/core/kernel26, edit config and enable HIGHMEM64G, remove/update md5sums in PKGBUILD and run makepkg.
http://pank.org/blog/2006/05/linux-kernel-high-memory-suppo.html
Processor type and features ---> High Memory Support (4GB) ---> off, 4GB, 64GB 三個選項 預設 off, 只能抓到 1G
https://answers.microsoft.com/en-us/windows/forum/windows_10-other_settings/system-nt-kernel-system-high-memory-usage-win10/1be11051-6e4a-46e0-832a-dd504722ed38
Sep 16, 2015 · Tech support scams are an industry-wide issue where scammers trick you into paying for unnecessary technical support services. ... NT Kernel & System - High Memory usage - Win10 Hello, So after I updated to Win 10 from 8.1, this process won't stop bother me. ... First of all, I'm an Idiot, It's high MEMORY usage not CPU usage. And secondly I ...
https://www.kernel.org/doc/gorman/html/understand/understand005.html
As the addresses space usable by the kernel (ZONE_NORMAL) is limited in size, the kernel has support for the concept of High Memory. Two thresholds of high memory exist on 32-bit x86 systems, one at 4GiB and a second at 64GiB. The 4GiB limit is related to the amount of memory that may be addressed by a 32-bit physical address. To access memory between the range of 1GiB and 4GiB, the …
http://linux-mm.org/HighMemory
Memory above the physical address of 896MB are temporarily mapped into kernel virtual memory whenever the kernel needs to access that memory. Data which the kernel frequently needs to access is allocated in the lower 896MB of memory (ZONE_NORMAL) and can be immediately accessed by the kernel (see Temporary mapping ).
https://en.wikipedia.org/wiki/Kernel_(operating_system)
The critical code of the kernel is usually loaded into a separate area of memory, which is protected from access by application programs or other, less critical parts of the operating system. The kernel performs its tasks, such as running processes, managing hardware devices such as the hard disk, and handling interrupts, in this protected kernel space. In contrast, application programs like browsers, word …
https://en.wikipedia.org/wiki/High_memory
On computers with a lot of physical memory, this can mean that there exists memory that the kernel cannot refer to directly—this is called high memory. When the kernel wishes to address high memory, it creates a mapping on the fly and destroys the mapping when done, which incurs a performance penalty.
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