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• Suspected network performance issue on VirtualBox Ubuntu guest on Win7 host

  - by Adam

  I set up Ubuntu 12.04 in VirtualBox on the Win7 machine I was allocated on my new project. I am running Java, Eclipse, Tomcat to develop a large data-intensive application and I noticed that this application runs at half the speed of my colleague's identical machine, where he runs it all under Windows. I think I have narrowed down the performance issue to the network, after comparing and equalising all the Java VM settings with my colleague. Is there a ping test I can do or some other network diagnostic test to flag up any problems? To give some background, the network performance is confusing. Running a network speed test to my colleague's machine with iperf shows speeds of 6 Mb/s from my Ubuntu guest, and 90 Mb/s from the win7 host. Large downloads, e.g. the Java SDK, come down at about 1.2 MB/s on both the guest and the host. Pings are sub-1ms on the host, but 1.5ms on the guest. I also did a broadband speed test, and got 10Mb/s download speed on both, but the host has an upload speed of 10Mb/s but the guest only uploads at 3Mb/s. I've been trying to diagnose any MTU problems with ping -M do to identify any kind of packet fragmentation problem but it's progressing very slow because I don't have much experience in this area. From what I read on other people's networking issues with VB and Linux guests on Win7 hosts, I should be able to get the speed on the guest up to the same level as the host. I installed a fresh VM with Ubuntu again to see if I'd foobar'd it somehow, but I'm getting the same readings with iperf on the virgin installation. My setup is: Adapter 1: Intel PRO/1000 MT Desktop (NAT) Adapter 2: ditto (host-only adapter) eth0 Link encap:Ethernet HWaddr 08:00:27:0b:76:bf inet addr:10.0.2.15 Bcast:10.0.2.255 Mask:255.255.255.0 inet6 addr: fe80::a00:27ff:fe0b:76bf/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:86236 errors:0 dropped:0 overruns:0 frame:0 TX packets:49369 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:69163946 (69.1 MB) TX bytes:3530535 (3.5 MB) eth2 Link encap:Ethernet HWaddr 08:00:27:a3:26:b8 inet addr:192.168.56.101 Bcast:192.168.56.255 Mask:255.255.255.0 inet6 addr: fe80::a00:27ff:fea3:26b8/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:59 errors:0 dropped:0 overruns:0 frame:0 TX packets:57 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:9148 (9.1 KB) TX bytes:7648 (7.6 KB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:701 errors:0 dropped:0 overruns:0 frame:0 TX packets:701 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:66321 (66.3 KB) TX bytes:66321 (66.3 KB)

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• How to encrypt dual boot windows 7 and xp (bitlocker, truecrypt combo?) on sdd (recommended?)

  - by therobyouknow

  I would like to setup a dual boot Windows 7 and Windows XP laptop/notebook computer where each operation system's partition is fully encrypted. I would like to do this on a SSD - a 128Gb Crucial M4. My research Dual boot of truecrypt encrypted OSs on one drive (not possible - in Truecript 7.x at time of writing) This cannot be done on a standard Truecrypt setup - it will only support encrypting one of the operating systems. I have tried this and also read about it here on superuser.com However, I did see a solution here that uses grub4dos as the initial bootloader to chain to separate truecrypt encrypted OSs, in my case Windows 7 and Windows XP: http://yyzyyz.blogspot.co.uk/2010/06/truecrypt-how-to-encrypt-multiple.html I am not going to consider this solution as it relies upon some custom code for use in the bootloader that is provided by the author. I would prefer a solution that can be fully understood so that I can be sure that there is nothing undesirable occuring (i.e. malware or just simply bugs in the code). I would like to believe such a solution doesn't have those risks but I can't be sure. BitLocker and Truecrypt combination - possible solution? So I am now considering a combination of encryption programs: I now aim to encrypt Windows XP with Truecrypt and Windows 7 with BitLocker. Assuming Truecrypt bootloader can boot into non-Truecrypt OSs (e.g. via hitting Escape to go to another menu), then this solution may be viable. SSDs and Encryption (use fastest possible spinning hard disk instead (?)) I read on various superuser.com posts and elsewhere that current SSDs are not suited to whole drive encryption for various reasons: impact of performance algorithms that give SSDs advantage over spinning harddisks. Algorithms used in compression of data for example. Wear on the SSD, shortening its life Security issues whereby data is repeated, as indicated in some Truecrypt documentation So I am now considering not using SSD. But with the aim to have the fastest drive possible, I am considering using the Western Digital Scorpion black 2.5" 7200rpm harddisk as this appears to be top rated among spinning platter-based harddrives (don't work for Western Digital). Summary So to achieve whole drive encrypted dual boot Windows 7 and Windows XP with minimal performance impact I intend to use a combination of Truecrypt and Bitlocker on a top-rated conventional spinning platter-based harddisk. Questions Will my summary: achieve whole disk encryption of the dual-boot Windows XP, Windows 7? OR an you suggest a simpler solution, including one that only requires only Truecrypt (BitLocker not available on XP). Or another encryption tool, including paid-for? provide the highest performance. Am I correct to avoid using SDD with encryption for the reasons I discovered? Are the concerns about SSDs and encryption still very real (some articles I read go back to 2010) Thanks for your input!

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• How to create an Iptables rule using domain name

  - by Supratik

  Hi, Can anyone please suggest a way to use domain name in Iptables rules. Regards Supratik

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• Cisco ASA - Unable to create "range" type of network object on 8.2

  - by j2k4j

  I'm wanting to block a range of ip addresses on my Cisco ASA 5520 (8.2) using ASDM 6.4. In the help files/cisco documentation, it says, just create a network object with a "range" type, and use that in a blocking access rule... When I'm accessing the ASA (8.2) with ASDM 6.4, I go to configfirewallobjectnetwork objects & groups, then click "add" to add the IP range as a "network object", I get the following 4 fields to fill out: Name: IP address: Netmask: Description: That's all... In the context-sensitive help files, it says that there should be a Type drop-down to select, with "range" being one of the options, but there is no "Type" drop-down list... If I try to create a "network object group" instead of just "network object", then I get a "Type" drop down list, but it only contains two options: network & host (No "Range" option here either) Can someone help me figure out how to block a range of IP's, using the current 8.2 version on the ASA? Thanks for any pointers or tips!

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• Where does netstat get the process name?

  - by tjameson

  I am developing a node application and there is an option to set the process title (process name). This only sets it in some tools (like ps and top), but not in htop or netstat. I found this article that explained how most applications do it, but it doesn't change in netstat. That lead me to wonder where those programs are getting the process name. Would they be getting it from /proc/##/cmdline? (## being the PID of the process) I figure messing with things in /proc is a bad idea (and probably not possible), so if this is where those programs are getting it, is there a way to change it?

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• Is there a performance penalty using in-place models/families in a large Revit project

  - by Jaips

  (I'm quite new at Revit so apologies if my concepts are a bit inaccurate) I have heard using, in-place models in Revit projects is poor practice since it can slow down a large project. However I noticed Revit also organising inplace models lumping them with the rest of the families. So my question is: Is there really any performance penalty/benefit to be had by inserting families from an external file as opposed to creating inplace models in a Revit project?

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• Notebook with NVIDIA Optimus not switching video card in games

  - by user140739

  I have a Samsung RC720 notebook with Intel Integrated Graphics and NVIDIA GeForce GT 520M. As you can see it has two video adapters and Optimus is supposed to switch between them. But when I choose dedicated GPU in NVIDIA Control Panel and try to run, for example, GTA IV, it uses integrated graphics and I get very poor performance. I have already installed last NVIDIA and notebook drivers, chose high-performance in NVIDIA Control Panel, tried to execute with "Run with graphics processor..." context option and so on. Thanks for help.

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• Is there a performance pentalty using in-place models/families in a large Revit project

  - by Jaips

  (I'm quite new at Revit so apologies if my concepts are a bit inaccurate) I have heard using, in-place models in Revit projects is poor practice since it can slow down a large project. However i noticed Revit also organising inplace models lumping them with the rest of the families. So my question is: Is there really any performance penalty/benefit to be had by inserting families from an external file as opposed to creating inplace models in a Revit project?

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• Resolving host names to their domain name in an internal BIND domain

  - by Adam Plumb

  I'm setting up a domain on my home network for learning purposes, using BIND on CentOS to act as the name server. I've got the name server up and running as type master for my internal domain (plumbnicoll.family), and can do forward and reverse lookups from other computers in my LAN. For example, host office2.plumbnicoll.family correctly returns office2.plumbnicoll.family has address 192.168.1.3. What I'd like is to be able to resolve just office2 to its address, without needing to put .plumbnicoll.family at the end. Is this possible, or even desirable to do? I'm running a mixed environment at home with both Linux and Windows computers.

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• Host forwarding fails, server is up, domain name tests ambiguous

  - by jayunit100

  I have a domain name registered with http://www.registryrocket.com/ The "main" site, which is called rudolfcode.net, is registered under godaddy, and forwards to a heroku site (rudolfcode.herokuapp.com). I have found that the main site, rudolfcode.net works, but the hostgator forwarding has stopped working (firefox simply fails when you point to http://www.rudolflabs.com, which is the domain name registered by hostgator). How can I debug this issue ? Finally, I have tried to run some DNS tests, and here are the results : Im not sure what the failures mean .... But Im pretty sure that "Conecting to WWW Home Page" failed is a pretty bad sign ! Thanks.

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• Is (Ubuntu) Linux file copying algorithm better than Windows 7?

  - by Sarath

  Windows Copying is a real mess ever since Windows Vista. Even Microsoft claims they've improved the performance, from a user perspective, it's not quite visible. Even with single file the copying window appears too much time for 'Calculating' and then finishing the copy(Even after 100% completion some times the dialog remains active). At the same time, I was backing up some files in Ubuntu Linux. I felt it's really fast. Might be a feeling caused by faster UI updates. I read an informative post from Jeff Atwood few years back on Windows File Copying. but what my specific questions are Is (Ubuntu) Linux file performance is better than Windows-7? Are both algorithms, Windows and Linux is making use of multiple threads and pipelining mechanism to improve the speed? If yes, which one is better?

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• i5+SSD or i7+HDD gives better performance [closed]

  - by Cas Sakal

  Which performs better for developers on a notebook(running VS.NET, SQL Server, no gaming); (A) i5 540M + SSD (Intel) or (B) i7 720M + 7200 RPM HDD (Western Digital) In short, I want to ask whether the performance difference between i5 540M and i7 720M can be compensated via using solid state drive instead of using a hard drive? Thank you, cas

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• What would cause a query being ran from SSMS on local box to run slower then from remote box

  - by Racter

  When I run a simply query such as "Select Column1, Column2 from Table A" from within SSMS running on my production SQL Server the results seems to take extremely long (45Min). If I run the same query from my dev system’s SSMS connecting to the production SQL Server the results return within a few seconds (<60sec). One thing I have notices is if the system was just rebooted performance is good for a bit. It is hard to determine a time as I have had it start running slow very quickly after reboot but at most it performed good for 20min and then start acting up. Also, just restarting the SQL service does not resolve the issue or provide a temporary performance boost. Specs for Server are: Windows Server 2003, Enterprise Edition, SP2 4 X Intel Xeon 3.6GHz - 6GB System Memory Active/Active Cluster SQL Server 2005 SP2 (9.0.3239)

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• Windows 7: "Replace All Child Object Permissions" Doesn't Stay Checked

  - by raywood

  I right-click on a top-level folder in Windows Explorer. I choose Properties Security tab Advanced Change Permissions. I check "Replace all child object permissions with inheritable permissions from this object" Apply. I get a Windows Security dialog that says, "Setting security information on" the list of objects that flashes by. But now the "Replace all child object permissions" box is unchecked. What is happening here?

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• Using rsync to synchronise folders without overwriting files of same name on Mac OS X

  - by Adam

  I would like to synchronise the contents of two directories. Without overwriting but to create a copy if two files have the same name, but different sizes Without duplicating if two files have the same name and size. To work recursively So far I have found the following command which might work $ rsync -varE --progress ~/folder /volumes/server/folder But I'm not entirely sure what the -E flag does. It was suggested by a user on bananica.com but couldn't see a description for it in the manual. Would this do what I require successfully? Thanks

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• Query Performance Degrades with High Number of Logical Reads

  - by electricsk8

  I'm using Confio Ignite8 to derive this information, and monitor waits. I have one query that runs frequently, and I notice that on some days there is an extremely high number of logical reads incurred, +300,000,000 for 91,000 executions. On a good day, the logical reads are much lower, 18,000,000 for 94,000 executions. The execution plan for the query utilizes clustered index seeks, and is below. StmtText |--Nested Loops(Inner Join, OUTER REFERENCES:([f].[ParentId])) |--Clustered Index Seek(OBJECT:([StructuredFN].[dbo].[Folder].[PK_Folders] AS [f]), SEEK:([f].[FolderId]=(8125)), WHERE:([StructuredFN].[dbo].[Folder].[DealId] as [f].[DealId]=(300)) ORDERED FORWARD) |--Clustered Index Seek(OBJECT:([StructuredFN].[dbo].[Folder].[PK_Folders] AS [p]), SEEK:([p].[FolderId]=[StructuredFN].[dbo].[Folder].[ParentId] as [f].[ParentId]), WHERE:([StructuredFN].[dbo].[Folder].[DealId] as [p].[DealId]=(300)) ORDERED FORWARD) Output from showstatistics io ... Table 'Folder'. Scan count 0, logical reads 4, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Any ideas on how to troubleshoot where these high logical reads come from on certain days, and others nothing?

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• Getting list of opened ssh connections by name

  - by lyrae

  I have a config file in my .ssh dir that looks like this Host somehostA HostName 123.45.67.89 User katsh So from my local machine, i can ssh into multiple machines by their name in the config file, like so ssh somehostA ssh somehostB ssh somehostC ... etc Is it possible to get a list of all machines i am connected to, by their name? I know I can do: lsof -i tcp -n | grep '\<ssh\>' and i'll get something like ssh 9871 katsh 3u IPv4 400199 0t0 TCP 987.654.2.2:47329->987.654.2.2:47329:ssh (ESTABLISHED) ssh 20554 katsh 3u IPv4 443965 0t0 TCP 123.456.7.8:41923->123.456.7.8:ssh (ESTABLISHED) But it does not list their names, just IP

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• Duplicate Name Exists error from virtual PC with NAT network configuration

  - by Phred

  Whenever I change the network configuration to NAT for a virtual machine running under Virtual PC 2007, I get "A duplicate name exists on the network." error. There is no other machine on my network with this name and running the VM in any other network configuration doesn't cause this error. This seems to be a common problem with Virtual PC 2007 based on a google search but no-one seems to have a solution to it. So far, I've discovered that turning off NETBIOS over TCP causes the problem to go away but I need to join this VM to a domain and you can't do that if NETBIOS over TCP is turned off.

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• Slow performance with WAMP localhost access from other devices

  - by Adam

  I setup a localhost WAMP server and other device can access my localhost site on my win8 laptop with computer name instead of IP (bc I have use DCIP so that the wireless router can assign me IP otherwise it will not work). However, problem is that the website (WordPress), access speed is extremely slow on other devices other than my localhost computer, usually a 3s task take at least 10 seconds. (i.e. view my localhost site with computer name in a phone within the same wireless network.) Is that normal? What could be the reason causing it? Thank You

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• Add folder name to beginning of filename - getting multiple renames

  - by Flibble Wibble

  I've used dbenham's excellent response to the question of how to add the folder name to the beginning of a filename in a cmd script. @echo off pushd "Folder" for /d %%D in (*) do ( for %%F in ("%%~D\*") do ( for %%P in ("%%F\..") do ( ren "%%F" "%%~nxP_%%~nxF" ) ) ) popd What I'm finding is that seemingly randomly (though it probably isn't) sometimes the script will run through several child folders and rename correctly but then it gets to a folder where it gets stuck in a loop and starts adding the folder name repeatedly to the file inside. I have 90,000 files in 300 folders to rename this weekend. Any chance you can guess the cause? PS: Is there a maximum number of files that are acceptable in each folder?

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• How to dump the Subject Alternative Name (SAN) from an SSL certificate file

  - by LonelyPixel

  I know that I can dump the entire information from a PEM certificate file with this command: openssl x509 -in certfile -noout -text And I've already found another direct parameter to show me only the expiry date of a certificate: openssl x509 -in certfile -noout -enddate But is there also a shortcut to get only the alternative names? Like when a certificate can be used for example.com as well as www.example.com. In the full dump, it's here: Certificate: Data: X509v3 extensions: X509v3 Subject Alternative Name: DNS:www.example.com, DNS:example.com I'd just like to save me the hassle to parse this output and get the domain names only. Is that possible? Otherwise, what would be best practices to parse this output? What can be assumed, what may change? Could I use a regexp like X509v3 Subject Alternative Name:\s*DNS:(\S+)(?:, DNS:(\S+))*?

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• Server browser resolves localhost, but not server name

  - by user147795

  I have a 2008 R2 server that I recently installed Solarwinds on. It is running IIS V7.5. I got the Solarwinds site loaded into IIS, however I can't resolve it when using the server name. It will however resolve when I put http:// localhost into the browser. I have tried editing the Hosts file to no avail. I have also played around with our DNS server to see if I can figure anything out there. I mess with the bindings in IIS, when I remove the binding for "localhosts" it stops resolving. But still get DNS lookup failed if I add the actual server name to the binding. Any ideas?

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• Help remembering name of boot CD (maybe it wasn't a live CD)

  - by daneee

  I am struggling to remember the name of a boot CD I have since lost the disc for. It was great for cloning discs, and resetting passwords. It's NOT the UBCD4Win, and it defos wasn't Knoppix. I have checked the LiveCD list and can't seem to find it there by doing a 'sort by'. I seem to remember it was called something like GS Tools but that might be more or less completely wrong. It had an unusual but memorable name. Makes me wonder how I came across it in the first place!

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• Which type of motherboard i should buy and why?

  - by metal gear solid

  If budged is not a problem. I just need best performance with less power consumption. I can purchase any cabinet , power supply and Motherboard. Is Power supply has any relation with Form factor? Is the size of motherboard and number of Slots only difference between all form factors? Is there any differences among form factors, related to performance of motherboard? Is bigger in Size (ATX) motherboard always better? Is it so smaller in Size motherboard will consume less power? What are pros and cons of each Form factor? What there are so many Form factor were created?

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• How to tell, before buying, if a given graphics card will play Full HD video?

  - by Dominykas Mostauskis

  I am looking for the cheapest video card that would be capable of smooth playback of Full HD (1080p) video on a Full HD screen. An answer by @Mikhail on a related question briefly mentioned that: performance of video playback is largely dependent on the video accelerators present [in the card] Is this true? Could anyone expand on that? Are there any benchmarks or specifications that could be used to tell if a given (low-end) card can play Full HD video smoothly? Benchmarks I encountered are oriented towards computer games, and using them to evaluate video playback performance may be less-than-optimal, I imagine.

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