tlb Questions
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I started from Patterson & Hennessy book with basic definitions and then followed the intel programming reference documents for more information about TLB.
From the intel documents i got to kn...
Braze asked 21/2, 2016 at 23:9
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Could some one direct me to a command to measure TLB misses on LINUX, please? Is it okay to consider minor page faults as TLB misses?
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The page table associate each virtual page with its associated physical frame.
The TLB does the same except it only contains a subset of the page table.
What is the purpose of the TLB if page tabl...
Lautrec asked 19/4, 2016 at 3:46
0
First of all, I’m sorry for so long question.
I do some simulation modeling task and I need to translate user space virtual address into kernel space physical addresses. I used three different meth...
Mission asked 20/3, 2016 at 8:53
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I've heard that TLB is maintained by the MMU not the CPU cache.
Then Does One TLB exist on the CPU and is shared between all processor or each processor has its own TLB cache?
Could anyone please...
Almena asked 23/12, 2015 at 14:3
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Is page table updated when an entry is evicted from TLB? and if so, why? what information is updated in the page table? I think updating page table is not needed when the evicted page is clean.
Si...
Noyes asked 3/11, 2015 at 18:49
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In UC Berkley Video lectures on OS by John Kubiatowicz (Prof. Kuby) available on web, he mentioned that TLB hit doesn't mean that corresponding page is in main memory. Page fault can still occur.
T...
Laciniate asked 18/6, 2011 at 20:46
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I'm struggling to understand what happens when the first two levels of the Translation Lookaside Buffer result in misses?
I am unsure whether "page walking" occurs in special hardware circuitry, ...
Englebert asked 27/8, 2015 at 17:51
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Are there any Prolog implementations which support utilizing huge-pages (2MB/4MB per memory page) instead of the vanilla 4Kb memory pages.
Ideally, I would like to declare to the interpreter/compi...
Doggery asked 27/3, 2015 at 15:42
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What is the difference between Cache and Translation LookAside Buffer [TLB] ?
Monatomic asked 29/12, 2009 at 7:58
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Does anybody know if TLBs (L1 and L2) support simultaneous accesses with multiple page sizes in modern x86_64 microprocessor (Intel SandyBridge, AMD Bulldozer)? Does x86 core pipeline provides info...
2
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I have a very simple question, does QEMU emulate TLB? What happens when a guest linux system executes an "invlpg" instruction as it is for the invalidation of a TLB entry. I am aware that QEMU has ...
Eblis asked 16/3, 2015 at 6:21
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Prologue
I am an operating system hobbyist, and my kernel runs on 80486+, and already supports virtual memory.
Starting from 80386, the x86 processor family by Intel and various clones thereof ha...
Spahi asked 7/2, 2015 at 16:0
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I have the following specifications of an ARM based SoC:
L1 Data cache = 32 KB, 64 B/line, 2-WAY, LRU
L2 Cache = 1 MB, 64 B/line, 16-WAY
L1 Data TLB (for loads): 32 entries, fully associative
L2 ...
Lehmbruck asked 15/11, 2014 at 11:44
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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 abov...
Subtilize asked 20/5, 2010 at 17:42
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From a software point of view, what is the latency between an instruction that dirties a memory page and when the core actually marks the page dirty in the Page Table Entry (PTE)?
In other words, ...
Patti asked 28/10, 2011 at 0:41
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Could someone please explain the difference between a TLB (Translation lookaside buffer) miss and a cache miss?
I believe I found out TLB refers to some sort of virtual memory address but I wasn'...
Loathe asked 4/5, 2012 at 9:34
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I am observing the last few Intel microarchitectures (Nehalem/SB/IB and Haswell). I am trying to work out what happens (at a fairly simplified level) when a data request is made. So far I have this...
Jarboe asked 22/3, 2014 at 1:34
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I've been given the following problem and I'm not sure exactly how to approach it:
Consider a virtual memory system with the following properties:
· 35-bit virtual address
· 16 KB pages
...
Darciedarcy asked 19/11, 2013 at 17:2
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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 ...
Toscana asked 26/9, 2013 at 21:46
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I have been running some benchmarks on some algorithms and profiling their memory usage and efficiency (L1/L2/TLB accesses and misses), and some of the results are quite intriguing for me.
Consid...
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The Transparent Huge Pages(THP) support in recent Linux kernels allows automatic promotion/demotion between different page sizes (e.g., 4KB and 2MB in x86-64).
But I am not sure if THP can also pro...
Camala asked 18/10, 2012 at 16:46
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Does the Linux on x86-64 support multiple huge page sizes (e.g., both 2MB and 1GB page sizes beyond the 4KB base page size)? If yes, is there a way to specify that for a given allocation which huge...
Iridescent asked 7/5, 2012 at 20:52
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I've been experimenting with mremap(). I'd like to be able to move virtual memory pages around at high speeds. At least higher speeds than copying them. I have some ideas for algorithms which could...
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I want to estimate the performance overhead due to TLB misses on a x86-64 (Intel Nehalem) machine running Linux. I wish to get this estimate by using some performance counters. Does anybody has som...
Gravedigger asked 18/2, 2012 at 3:25
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