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Kernel Quest: Linux bogomips Quest

author is in the v3.13.0 version of the Linux kernel source of the experiment. There are few changes in this section, and other similar versions should be no different.first , the bogomips calculation is given in the file arch/mips/kernel/proc.c :seq_printf (M, "bogomips\t\t:%u.%0 2u\n ", cpu_data[n].udelay_val/(500000/hz), (Cpu_data[n].udelay_val/(5000/hz))% 100);Where HZ is the fixed constant at the time of kernel configuration, the only Udelay_val value left in this formula is unknown.

Flisikar imx51 configuration parameters and startup information

entries: 2048 (Order: 11,819 2 bytes)Dentry cache hash table entries: 65536 (Order: 6, 262144 bytes)Inode-Cache hash table entries: 32768 (Order: 5, 131072 bytes)Memory: 432 MB = 432 MB totalMemory: 432236kb available (4700 K code, 875 K data, 136 K init, 0 K highmem)Slub: genslabs = 11, hwalign = 32, order = 0-3, minobjects = 0, CPUs = 1, nodes = 1Nr_irqs: 368Mxc IRQ initializedMxc_early serial console at mmio 0x73fbc000 (options '123 ')Console [ttymxc0] EnabledConsole: Color dummy device 80x3

Linux boot Error

supervisor mode... OK. Calibrating delay using timer specific routine .. 4787.69 BogoMIPS (lpj = 23938475) Security Framework v1.0.0 initialized Capability LSM initialized Mount-cache hash table entries: 512 CPU: Trace cache: 12 K uops, L1 D cache: 8 K CPU: L2 cache: 128 K CPU: Hyper-Threading is disabled Compat vDSO mapped to ffffe000. Checking 'hlt 'instruction... OK. SMP alternatives: switching to UP code Freeing SMP alternatives: 13 k freed CPU0:

Study Notes on AM335x (TQ335x) -- Nand & amp; NIC Driver porting, am335xtq335x

, wraps every 178956969942ns [0.000062] OMAP clocksource: timer1 at 24000000Hz [0.000794] Console: color dummy device 80x30 [0.000846] Lock dependency validator: Copyright (c) 2006 Red Hat, inc ., ingo Molnar [0.000855]... MAX_LOCKDEP_SUBCLASSES: 8 [0.000863]... MAX_LOCK_DEPTH: 48 [0.000870]... MAX_LOCKDEP_KEYS: 8191 [0.000877]... CLASSHASH_SIZE: 4096 [0.000884]... MAX_LOCKDEP_ENTRIES: 32768 [0.000891]... MAX_LOCKDEP_CHAINS: 65536 [0.000898]... CHAINHASH_SIZE: 32768 [0.000906] memory used by loc

AM335x (TQ335x) study notes -- start the kernel, am335xtq335x

]... CHAINHASH_SIZE: 32768 [0.000 916] memory used by lock dependency info: 5167 kB [0.000924] per task-struct memory footprint: 1152 bytes [0.000966] Calibrating delay loop... 996.14 BogoMIPS (lpj = 4980736) [0.079040] pid_max: default: 32768 minimum: 301 [0.079436] Security Framework initialized [0.079561] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes) [0.079574] Mountpoint-cache hash table entries: 1024 (order: 0, 40 96 bytes) [0.08177

Android shutdown and Charging

. import_kernel_cmdline (0); obtain some parameters from the kernel. The obtained parameters are as follows: /# Cat/proc/cmdlineInitrd = 0x4c00000, 0xf9dfe lpj = 3350528 mtdparts = sprd-nand: 256 k (spl), 512 k (2 ndbl), 256 k (params), 512 k (vmjaluna ), 10 m (modem), 3840 k (fixnv), 3840 k (backupfixnv), 5120 k (dsp), 3840 k (runtimenv), 10 m (boot ), 10 m (recovery), 200 m (system), 190 m (userdata), 60

Limits on Linux system management startup time

electronic products. However, due to different applications, we can only use some of their experiences for reference, analyze and try your own problems. Key kernel components (Timer, IRQ, Cache, Mem Pages ......) Currently, there are no reliable and feasible optimization solutions for initialization. For items 2 and 3 in the above analysis results, CELF has a special optimization solution: "RTCNoSync" and "PresetLPJ ". The former is easier to implement by shielding RTC clock synchronization dur

How to view linux Command source code

For details about how to view the linux Command source code-Linux general technology-Linux technology and application information, see the following. I 've been using linux for a while. Sometimes I want to see the source code of ls, cat, more, and other commands. I haven't found the source code in the downloaded kernel source code. I searched online and summarized the method as follows: Take the ls command source code as an example. First, search for the package where the command is located.

Linux Startup time limit Optimization

forcibly specifying the lpj value in the startup parameter, which is based on the fact that the lpj value does not change without changing the hardware conditions. Therefore, after normal startup, record the "calibrating delay" value in the kernel information, and then you can forcibly specify the lpj value in the following form in the startup parameters:

Linux Startup time limit Optimization

time drift it has brought has reached the "second" level), and I will continue to pay attention to it. The latter skips the actual computation process by forcibly specifying the LPJ value in the startup parameter, which is based on the fact that the LPJ value does not change without changing the hardware conditions. Therefore, after normal startup, record the "Calibrating Delay" value in the kernel inform

Research on Quick Start Technology in Embedded Linux

decompression speed, resulting in the copy time (inversely proportional to the compression ratio) and the decompression time (generally proportional to the compression ratio). 2.2 kernel stage During kernel initialization, realtime clock (RTC) must be synchronized. This process takes 1 s of time and can be removed to save time, but the CPU may be 1 s different from the correct time. If the CPU clock is to be stored in RTC at shutdown, deviations will continue to accumulate. However, systems th

New Tricks: Extreme Optimization of Linux Startup time

of specific applications for clock accuracy, however, the kernel must be patched. It seems that CELF's current job is only to remove this process, rather than implementing the aforementioned "delay" to process RTC clock synchronization. For this reason, I have not introduced this optimization in my solution. After all, the time drift it brings has reached the "second" level. The latter skips the actual computation process by forcibly specifying the LPJ

Linux acceleration and extreme startup time optimization

the lpj value in the startup parameter, which is based on the fact that the lpj value does not change without changing the hardware conditions. Therefore, after normal startup, record the "calibrating delay" value in the kernel information, and then you can forcibly specify the lpj value in the following form in the startup parameters:

[HTML5 Game Development] challenge horizontal Act (III)

}); locationlist. push ({X: 0, Y: 0}); locationlist. push ({X: 100, Y: 0}); locationlist. push ({X: 150, Y: 20}); locationlist. push ({X: 5, Y: 0}); locationlist. push ({X:-30, Y: 10}); // attacked range: var hertlist = [[-30,-60, 60, 50], [-30, -60, 60, 50], [-30,-60,

Quick hue Color Ring Calculation

File: fasthue.txtName: Quick hue Color Ring CalculationAuthor: zyl910Blog: http://blog.csdn.net/zyl910/Version: v1.00Updata: 2006-11-3 Download (note the modified extension) 1. HSV Color Space H: hue ). Value Range: [0,360)0 degrees: Red, RGB :( 255, 0, 0), 255: R, 0: B, G +60 degrees: yellow, RGB: (255,255, 0), 255: G, 0: B, R-120 degrees: Green, RGB :( 0,255, 0), 255: G, 0: R, B +180 degrees: cyan, RGB :( 0,255,255), 255: B, 0: R, G-240 degrees: b

Using HTTP components to implement multiple engine search function

multiple engine results! Note: In the results of the search, because some of the engine's class uses the relative connection, so invalid (these results you can actually handle, but the author is too lazy, so do not want to spend that effort), but all the Web site and the Web page connection is valid, this article provides the code is only suitable for testing, Not suitable for specific applications, if you need specific applications, you need to use the appropriate HTTP components, or if you a

An article on optimizing the startup time of Linux system in foreign language __linux

/Deferred_Initcalls Adjust command line In their respective boot, the kernel has a correction delay time (for this udelay function). This means that a value is a small value and you need to measure it once. Find the LPJ value in the boot log. Now you can use this LPJ argument directly. 180ms can be saved here. This is directly added to the u-boot inside the cmd line OK is as follows: console=ttys0,115200 m

AS plotting (2)

. createEmptyMovieClip ("triangle", 1); lineStyle (0, 0x000000,100); with (_ root. triangle) {// draw the dotted line a1 = daxiao2 * math. sin (n + 1*60) * math. pi/180); b1 = daxiao1 * math. cos (n + 1*60) * math. (pi/180); a2 = daxiao2 * math. sin (n + (I + 1) * 60) * math. pi/180); b2 = daxiao1 * math. cos (n + (I + 1) * 6

ASP database programming: How to display paging when ADO accesses a database

of the RecordSet.EOF property: The current indicator refers to the last stroke of the RecordSet.Move method: Moves the indicator to a record in the recordset.AbsolutePage property: Sets the position of the current record on which page AbsolutePosition property: The current position of the indicator in the RecordSet.PageCount property: Displays data for how many "pages" the Recordset object includes.PageSize Properties: Displays the number of records displayed on each page of the Recordset objec

How to view Linux Command source code and function source code

I 've been using Linux for a while. Sometimes I want to see the source code of the LS, Cat, more, and other commands. I couldn't find the source code in the downloaded kernel source code, but I searched the internet, the methods are summarized as follows: Take the LS command source code as an example. First, search for the package where the command is located. The command is as follows:lpj@lpj-linux:~$ which ls/bin/ls Use the command to search for

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