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• How can a driver change the kernel page table?

  - by Naruto

  I am encountering an issue with kernel memory. When my driver finishes running, the other processes in kernel fail to run, for example, I run ls, the command crashes the kernel with error "Corrupted page table" at a specified address. I do not know whether the page table of my driver relates to the page table of other process. How can my driver changes the page table of the other processes? And how the driver of a process relates to the kernel page table? As I know when the driver runs, it will be switched to kernel context. Kernel has its own page table and the driver has it own one. What is the relation among the kernel page table, the page table of my driver and the page table of the other processes when it runs in kernel context?

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• Lightweight, low cost enterprise backup solution

  - by Scott

  Looking for a backup solution primarily for Windows clients (XP/7), that will either back up to 2 different servers (1 on site, 1 off site - internet - can be our own server), or back up to 1 server and then we would need to somehow backup that server offsite/internet. By lightweight, I mean the backup client software should not eat up much memory and processor since some of the client machines are older. I am used to using Crashplan for home use - the pricing is nice for the amount of backup I get, and it works great / easy to install and get going - I can back up to my own machines locally and over the net. However, the price is going to be a little steep for enterprise level backup, 1500+ machines. Possibly ZManda and Bacula are good choices to consider? Are they light weight? Can the clients/agents be set to go over the net and/or multiple backup servers?

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• High Lock Wait ratio in MySQL

  - by FunkyChicken

  on my site I log every pageview (date,ip,referrer,page,etc) in a simple mysql table. This table gets very little selects (3 per minute), but a lot of inserts. (about 100 per second) Today I changed this table from an InnoDB table to a MEMORY table, this made sense to me to prevent unnecessary hard disk IO. I also prune this table once per minute, to make sure it never get's too big. -- Performance wise, things are running fine. But I noticed that while running tuning-primer, that my Current Lock Wait ratio is quite high. Current Lock Wait ratio = 1 : 561 My question: Should I worry about this Lock Wait Ratio? And is there something I can change in my my.cnf to improve things so that the lock wait ratio isn't so high?

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• Which Windows OS Supports 8 GB RAM in a Laptop and Suggestions for a Better Laptop for Personal & De

  - by Ellen

  I am about to purchase a laptop and have zeroed on the following two of them. Toshiba L500-ST2544 Toshiba L505-ES5034 The Common Specification for both of them are as follows - RAM - 4GB DDR3 Memory HDD - 320 GB Processor - Intel® Core™ i3-330M Processor WebCam and Mic - Available HDMI Port - Available Numeric Key Pad - Available Windows 7 (64 bit) Home Premium Now, the only difference between ST2544 and ES5034 is that, the ST2544 has a maximum of 2 slots with 2 GB in each. So, you can have a max of 4 GB RAM in that. The ES5034 can support 8 GB RAM, so, in a couple of years, if I want to add another 4 GB RAM I will be able to do it. The price for ST2544 is USD 629.00 whereas, the price for a ES5034 is USD685. A difference is USD 55.00 (not a major amount, but still something extra). Is it worthwhile going for the ES5034? Which Windows Operating System supports 8 GB of RAM?

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• IIS7.5 App Pool recycling. What is the best schedule for Recycling

  - by mikedopp

  I have been using IIS7.5 Since its release. I am also using commerce server 2007sp2. Due to Commerce Servers Need for memory and processor I have the app pool the website is assigned to recycling at midnight every night. My Question is what is the best time table to recycle heavy web app pools? I am looking to keep speed and not bump potential customers while recycling multiple times a day if possible. Another issue is that every few days the same app pool will hang and I have to force a reset of IIS to get it working again.

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• Firewire 800 with Windows

  - by Amitesh

  I have two windows machine with windows server 2003 installed on them. I am running a Lab View script on 1 machine and storing the data. But since it has less memory, I want to transfer data to another machine using firewire 800. Is it possible to configure out the second machine just as an external HDD attached to it and write data directly to it? (This is possible with MACs) Dont want to use the ethernet (internet/ TCP/IP prot.) to transfer the data. Is it possible? Thanks.

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• How should I capture Linux kernel panic stack traces?

  - by Alnitak

  What's current best practice to capture full kernel stack traces on a Linux system (RHEL 5.x, kernel 2.6.18) that occasionally panics in a device driver? I'm used to the "old" SunOS way of doing things - crash dumps get written to swap, and on reboot the dump gets retrieved in the local file system. man 8 crash refers to diskdump, but that appears to be unsupported. and/or deprecated. I've played with kdump, but it's unclear whether I can get a stack trace from that. Triggering a panic via Magic SysRq didn't create one. It also seems wasteful to reserve so much memory (128MB) just for a kexec crash recovery kernel.

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• Windows CE Remote Kernel Tracker - gathering data in one (more) file during a log period of time

  - by Nic

  I'm using the "Windows CE Kernel Tracker" tool to gather data from my embedded device. This is working fine for short period of time. It seems that the tool is getting data in memory and not on disk. I'm wondering if there is a way to take the data from the device and log it in one or more file on my development computer. This could be useful for long time test period : for instance, one night or one entire day. Any ideas? p.s. I don't want to log on to the device, I want to log on my development PC.

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• Do I need to conver the older Access Database, and, if so, how?

  - by octopusgrabbus

  I have an Access 2003 database. When I click on a pivot table, I get this message MS Access There isn't enough memory to complete the Automation object operation on the worksheet object. There is a lot of discussion concerning this message. Here is one link. http://community.spiceworks.com/topic/113228-access-2003-file-pivot-table-issue-when-opening-in-access-2010 But this particular link's explanation doesn't really go into fixing the problem in general, like fixing the pivot tables and getting things all nicely back together in the original Access database. That's why I am also interested in converting the database to 2010 format if that is possible. Are there instructions -- I cannot currently find them and would very much appreciate a link -- on dealing with this problem in a nice stepwise fashion?

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• Patriot-2 RAM on ASUS PK5-E not running at PC2-8500?

  - by evan

  I have a P5K-E Motherboard and recently upgraded to 8GB of RAM (4 2GB sticks of PC2-8500 1066 MHz - Patriot Viper 2). When looking at the RAM with PC Wizard 2010 it's showing the RAM being recognized PC2-6500. I've read elsewhere that this is a common problem and requires manually changing the DRAM Voltage in BIOS to 2.2. I've done this and I'm still getting it recognized as PC2-6500. (I also manually set the FSB speed to 1066MHz instead of the AUTO). Any ideas on how to get this memory working properly? Thanks in advance!

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• Nginx + PHP-FPM on Centos 6.5 gives me 502 Bad Gateway (fpm error: unable to read what child say: Bad file descriptor)

  - by Latheesan Kanes

  I am setting up a standard LEMP stack. My current setup is giving me the following error: 502 Bad Gateway This is what is currently installed on my server: Here's the configurations I've created/updated so far, can some one take a look at the following and see where the error might be? I've already checked my logs, there's nothing in there (http://i.imgur.com/iRq3ksb.png). And I saw the following in /var/log/php-fpm/error.log file. sidenote: both the nginx and php-fpm has been configured to run under a local account called www-data and the following folders exits on the server nginx.conf global nginx configuration user www-data; worker_processes 6; worker_rlimit_nofile 100000; error_log /var/log/nginx/error.log crit; pid /var/run/nginx.pid; events { worker_connections 2048; use epoll; multi_accept on; } http { include /etc/nginx/mime.types; default_type application/octet-stream; # cache informations about FDs, frequently accessed files can boost performance open_file_cache max=200000 inactive=20s; open_file_cache_valid 30s; open_file_cache_min_uses 2; open_file_cache_errors on; # to boost IO on HDD we can disable access logs access_log off; # copies data between one FD and other from within the kernel # faster then read() + write() sendfile on; # send headers in one peace, its better then sending them one by one tcp_nopush on; # don't buffer data sent, good for small data bursts in real time tcp_nodelay on; # server will close connection after this time keepalive_timeout 60; # number of requests client can make over keep-alive -- for testing keepalive_requests 100000; # allow the server to close connection on non responding client, this will free up memory reset_timedout_connection on; # request timed out -- default 60 client_body_timeout 60; # if client stop responding, free up memory -- default 60 send_timeout 60; # reduce the data that needs to be sent over network gzip on; gzip_min_length 10240; gzip_proxied expired no-cache no-store private auth; gzip_types text/plain text/css text/xml text/javascript application/x-javascript application/xml; gzip_disable "MSIE [1-6]\."; # Load vHosts include /etc/nginx/conf.d/*.conf; } conf.d/www.domain.com.conf my vhost entry ## Nginx php-fpm Upstream upstream wwwdomaincom { server unix:/var/run/php-fcgi-www-data.sock; } ## Global Config client_max_body_size 10M; server_names_hash_bucket_size 64; ## Web Server Config server { ## Server Info listen 80; server_name domain.com *.domain.com; root /home/www-data/public_html; index index.html index.php; ## Error log error_log /home/www-data/logs/nginx-errors.log; ## DocumentRoot setup location / { try_files $uri $uri/ @handler; expires 30d; } ## These locations would be hidden by .htaccess normally #location /app/ { deny all; } ## Disable .htaccess and other hidden files location /. { return 404; } ## Magento uses a common front handler location @handler { rewrite / /index.php; } ## Forward paths like /js/index.php/x.js to relevant handler location ~ .php/ { rewrite ^(.*.php)/ $1 last; } ## Execute PHP scripts location ~ \.php$ { try_files $uri =404; expires off; fastcgi_read_timeout 900; fastcgi_pass wwwdomaincom; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; include fastcgi_params; } ## GZip Compression gzip on; gzip_comp_level 8; gzip_min_length 1000; gzip_proxied any; gzip_types text/plain application/xml text/css text/js application/x-javascript; } /etc/php-fpm.d/www-data.conf my php-fpm pool config ## Nginx php-fpm Upstream upstream wwwdomaincom { server unix:/var/run/php-fcgi-www-data.sock; } ## Global Config client_max_body_size 10M; server_names_hash_bucket_size 64; ## Web Server Config server { ## Server Info listen 80; server_name domain.com *.domain.com; root /home/www-data/public_html; index index.html index.php; ## Error log error_log /home/www-data/logs/nginx-errors.log; ## DocumentRoot setup location / { try_files $uri $uri/ @handler; expires 30d; } ## These locations would be hidden by .htaccess normally #location /app/ { deny all; } ## Disable .htaccess and other hidden files location /. { return 404; } ## Magento uses a common front handler location @handler { rewrite / /index.php; } ## Forward paths like /js/index.php/x.js to relevant handler location ~ .php/ { rewrite ^(.*.php)/ $1 last; } ## Execute PHP scripts location ~ \.php$ { try_files $uri =404; expires off; fastcgi_read_timeout 900; fastcgi_pass wwwdomaincom; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; include fastcgi_params; } ## GZip Compression gzip on; gzip_comp_level 8; gzip_min_length 1000; gzip_proxied any; gzip_types text/plain application/xml text/css text/js application/x-javascript; } I've got a file in /home/www-data/public_html/index.php with the code <?php phpinfo(); ?> (file uploaded as user www-data).

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• Asus laptop not retaining Aero theme when unplugged

  - by expiredninja

  The problem i'm having occurs when i unplug my laptop, it disregards several elements of my theme. The taskbar becomes unlocked. My desktop background is turned white. The transparency on my windows goes away. I can fix these things by running the Aero trouble shooting utility, which mentions something about the color bit depth These are these specs for the computer: Asus Laptop / Intel® Pentium® Processor / 15.6" Display / 4GB Memory Model: X54H-BD3MA SKU: 4005394 I'm sure there are duplicates of this, just not sure whick one refers to me. Thank you. Also i think someone should add an "unplugged" tag.

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• Tracking down Data Execution

  - by Agnel Kurian

  I have some malware infecting one of our machines at home. It first showed up as winulty.exe. After investigating, I am of the opinion that winulty.exe itself is an uninfected file but is being modified after it has loaded into memory. Turning on Data Execution Prevention for all processes and services has confirmed this to be true. How do I track down the process responsible for this? I've used File Monitor from sysinternals.com to monitor winulty.exe and see this being accessed by the svchost.exe instance hosting most of the system services and also by dfrgntfs.exe. How do I know which service or which DLL has been infected?

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• Laptop Locking Up

  - by David

  I am having a very weird issue on a Lenovo W510 laptop. It will lock up randomly. I have had it lock up during post, during the boot-up of Linux, during login, and after the login. The following are tests that I have performed on the laptop. I ran memtest I took out the extra memory module. I swapped the HDD with another HDD that had Windows 7 on it. (It BSOD'd, and before anyone could possibly read the error line, it restarts.) I tried taking the battery out and booting with only the Power cord. The only other options I can think of the problem being are the motherboard or the PSU. If anyone has any advice, I appreciate it. If not, the HP guy will be here in a few days to fix it. I would just love to call them up and tell them that the service is no longer needed.

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• Active Directory Profile Slows down machine

  - by boburob

  I have a strange issue with an Active Directory profile. When the user logs onto a machine with his profile, the whole machine becomes incredibly slow and unresponsive, with programs hanging and taking an age to load everything. If I log into the same machine with any other profile nothing happens. I took a look at his original profile, any start up programs, login scripts, etc and could not see what could be causing this. The machine is not running out of memory or CPU. Nothing strange is appearing in the event log and I can see nothing running under his profile which may cause this. So I created the user a new profile to test this on and exactly the same thing happens on the first login. The only thing which would of been carried across is the security groups the user is assigned to, yet I have other users with the same groups who do not experience these issues so I am now at a complete loss on where to go next!

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• ASA Slow IPSec Performance

  - by Brent

  I have a IPSec link between two sites over ASA 5520s running 8.4(3) and I am getting extremly poor performance when traffic passes over the VPN. CPU on the device is 13%, Memory at 408 MB, and active VPN sessions 2 so the load on the device is particularly low. Screenshot of wireshark file transfer between the two hosts over the VPN: The large amount of Header checksum failures is alarming, but I am not sure what to check now. I perf is showing around 4-5 Mbit/sec with differing TCP window sizes. Show Run on the ASA http://pastebin.com/uKM4Jh76 Show cry accelerator stats http://pastebin.com/xQahnqK3

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• Tomcat access logs - are failed requests included?

  - by Maxim Eliseev

  We have a RESTful web service (Java, hosted in Tomcat on Ubuntu on Amazon EC2). From time to time it fails (not every week). When it fails, Java CPU consumption goes to 100% and it takes all available memory. It does not finish by itself. I have to restart the server. There is nothing suspicious in Tomcat access logs. I guess one of our users could submit a very "heavy" request which brought the server down. Is it possible this request is not in Tomcat logs since it never finished?

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• Apache worker is crashing after 3.000 users

  - by user1618606

  I activated Apache Worker on my VPS and I'm having problems, 'cause the website is crashing when 3000 users are accessing the website. I'm using http://whos.amung.us/stats/2jzwlvbhvpft/ as counter. My Apache Worker configuration: KeepAlive On MaxKeepAliveRequests 0 KeepAliveTimeout 1 <IfModule mpm_worker_module> ServerLimit 20000 StartServer 8000 MinSpareThreads 10400 MaxSpareThreads 14200 ThreadLimit 5 ThreadsPerChild 5 MaxClients 20000 MaxRequestsPerChild 0 </IfModule> The VPS have the SO: Debian 64 LAMP, memory: 14gb and CPU: 24ghz What I could to do to give a best performance?

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• Force Windows to cache executables without running them?

  - by Josh Einstein

  Is there a way to force Windows to pre-load certain EXE/DLL binaries into its prefetch/superfetch cache as if they had been executed? I have a particular application that loads pretty slowly on first run but if it's "warm" (recently executed) it starts pretty quickly. I'd like to prime the cache early in the background before the application is needed. But since it shows a UI, I'm looking for a way to do this silently. So simply launching the application it isn't ideal. Thanks you in advance. Prompted by David's suggestion in the comments, I wrote a PowerShell script to memory map the files, seek to the end, and close them. I haven't done any controlled tests yet and it could just be my imagination, but Sublime Text (the application in question) appeared to load much more quickly this time around and I haven't used it for several hours.

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• JFFS2 poor mount performance

  - by Marcin Polkowski

  I run multiple ARM boards with Debian Linux installed. Board is equipped with 512 MB of NAND memory. I've observed that after ~3 months of continuous run booting time increased significantly - it takes over 3 minutes to mount filesystem (JFFS2). System was using about 35% of available storage so I’ve removed unnecessary files (got to ~18%) but this didn't change anything. Then I realized that my software produces directories that are left empty so I’ve removed ~500 empty and unnecessary dirs. This didn’t help either. After system is started I see JFFS2 garbage collector (jffs2_gcd_mtd4) running and occupying over 90% of CPU. Now my question: is there a way to „optimize” JFFS2 filesystem for better performance - faster booting (my system have limited timid to boot up)? It would be great if this optimization could be done remotely - I have no physical access to boards.

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• Explanation of nodev and nosuid in fstab

  - by Ivan Kovacevic

  I see those two options constantly suggested on the web when someone describes how to mount a tmpfs or ramfs. Often also with noexec but I'm specifically interested in nodev and nosuid. I basically hate just blindly repeating what somebody suggested, without real understanding. And since I only see copy/paste instructions on the net regarding this, I ask here. This is from documentation: nodev - Don't interpret block special devices on the filesystem. nosuid - Block the operation of suid, and sgid bits. But I would like a practical explanation what could happen if I leave those two out. Let's say that I have configured tmpfs or ramfs(without these two mentioned options set) that is accessible(read+write) by a specific (non-root)user on the system. What can that user do to harm the system? Excluding the case of consuming all available system memory in case of ramfs

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• Painless way of consolidating files across multiple machines/OSes

  - by 5arx

  Just bought a NAS. So I thought I'd get all our photos, media files and pdfs consolidated, de-duplicated, de-junked and virus-checked and stick them all on it. We have 3 laptops, one running Windows, the others OSX. We have a file server running Windows - it was the result of an earlier attempt at a networked fileserver - and a Mac Pro that is also kind of a server (previous attempts at this job have resulted in most of our stuff being on it). Also memory cards/sticks, cd backups and so on. I would be grateful if anyone could suggest a strategy or, ideally, tool(s) I could use to solve this problem. It is probably no more than one or two terabytes of data in total, but I can imagine that going through it all manually, file-by-file may well drive me insane.

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• Top ten security tips for non-technical users

  - by Justin

  I'm giving a presentation later this week to the staff at the company where I work. The goal of the presentation is to serve as a refresher/remidner of good practices that can help keep our network secure. The audience is made up of both programmers and non-technical staff, so the presentation is geared for non-technical users. I want part of this presentation to be a top list of "tips". The list needs to be short (to encourage memory) and be specific and relevant to the user. I have the following five items so far: Never open an attachment you didn't expect Only download software from a trusted source, like download.com Do not distribute passwords when requested via phone or email Be wary of social engineering Do not store sensitive data on an FTP server I have two questions: Do you suggest any additional items? Do you suggest any changes to existing items?

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• Computer turns off and on after start ..then goes dead

  - by Shiki

  I built a new PC from the following components: - CPU: Intel Core i7 950 - MB: Gigabyte X58A-UD3R - RAM: 2x2gb i7 Corsair memory - VGA: Zotac AMP2 GTX260 - HDD: 1 GreenSATA HDD (Western Digital 500gb RE2) When I turn it on, it goes for a few seconds, fans at maximum speed, then turns off. The again, it starts by itself.. and goes with fans on max speed, nothing happens. First I suspected my PSU. It's a Chieftec 450AA PSU. After I borrowed a Chieftec 550AA PSU, I tried to start with that. Exact same story. Any idea ? Do I need a bigger PSU? Reason why its not localized. I never seen this turn on, off, on. If you give answer for that, it would already help people like me, with the same problem.

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• A space-efficient guest filesystem for grow-as-needed virtual disks ?

  - by Steve Schnepp

  A common practice is to use non-preallocated virtual disks. Since they only grow as needed, it makes them perfect for fast backup, overallocation and creation speed. Since file systems are usually based on physical disks they have the tendency to use the whole area available1 in order to increase the speed2 or reliability3. I'm searching a filesystem that does the exact opposite : try to touch the minimum blocks need by an aggressive block reuse. I would happily trade some performance for space usage. There is already a similar question, but it is rather general. I have very specific goal : space-efficiency. 1. Like page caching uses all the free physical memory 2. Canonical example : online defragmentation 3. Canonical example : snapshotting

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