tlb

What is a TLB shootdown in SMPs? I am unable to find much information regarding this concept. Any good example would be very much appreciated. Carl Norum A quick example: You have some memory shared by all of the processors in your system. One of your processors restricts access to a page of that shared memory. Now, all of the processors have to flush their TLBs, so that the ones that were allowed to access that page can't do so any more. The actions of one processor causing the TLBs to be flushed on other processors is what is called a TLB shootdown. Gabe A TLB (Translation Lookaside Buffer)

Which addressing is used in processors x86/x86_64 for caching in the L1, L2 and L3(LLC) - physical or virtual(using PT/PTE and TLB ) and somehow does PAT(page attribute table) affect to it? And is there difference between the drivers(kernel-space) and applications(user-space) in this case? Short answer - Intel uses virtually indexed, physically tagged (VIPT) L1 caches: What will be used for data exchange between threads are executing on one Core with HT? L1 - Virtual addressing (in 8-way cache for define Set is required low 12 bits which are the same in virt & phys) L2 - Physical addressing

For Intel 64 and IA-32 processors, for both data and code independently, there may be both a 4KB TLB, and a Large Page (2MB, 1GB) TLB (LTLB). How does address translation work in this case? Would the hardware simply be able to access both in parallel, knowing that a double-hit can't occur? In the LTLBs, how would the entries be organized? I suppose, when the entry is originally filled from a page-structure entry, the LTLB entry could include information about how a hit on this entry would proceed? Anyone have a reference to a current microarchetucture? There are many possible designs for a TLB

Modern x86 CPUs have the ability to support larger page sizes than the legacy 4K (ie 2MB or 4MB), and there are OS facilities ( Linux , Windows ) to access this functionality. The Microsoft link above states large pages "increase the efficiency of the translation buffer, which can increase performance for frequently accessed memory". Which isn't very helpful in predicting whether large pages will improve any given situation. I'm interested in concrete, preferably quantified, examples of where moving some program logic (or a whole application) to use huge pages has resulted in some performance

Can someone clearly explain me the difference between a cache miss, a tlb miss and page fault, and how do these affect the effective memory access time? Let me explain all these things step by step. The CPU generates the logical address, which contains the page number and the page offset . The page number is used to index into the page table , to get the corresponding page frame number , and once we have the page frame of the physical memory (also called main memory), we can apply the page offset to get the right word of memory. Why TLB(Translation Look Aside Buffer) The thing is that page

I am reading Operating Systems Concept and I am on the 8th chapter! However I could use some clarification, or reassurance that my understanding is correct. Logical Addresses: Logical addresses are generated by the CPU, according to the book. What exactly does this mean? (In an execute-generated address system..) I assume when code is compiled for a program, the program has no idea where the code will be loaded in memory. All the compiler does is set up a general sketch of the program layout and how the image should be laid out, but doesn't assign any real addresses to it. When the program is