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• ESXi 5 network performance is slow

  - by R D

  We just did a fresh install of ESXi 5 on a host that was running ESX 4 before. Nothing has changed hardware wise. After the upgrade network performance is much slower. Even copying a big file from one VM to another VM within same virtual switch is slower compared to other hosts that are running ESX 4. Network cards are auto-negotiating at 1Gbps as were on ESX 4 prior to upgrade. All settings are default and I haven't played with Advanced Settings at all. Before opening a case with vmware, wanted to know if I am missing something or if others have experienced similar issues and found a fix?

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• How to open ports on modem for better torrent performance

  - by Mehper C. Palavuzlar

  I've been using utorrent to download and upload torrents for a long time. Recently someone told me that I need to open port(s) for utorrent from my modem settings for better downloading and uploading performance. Is it true? If yes, how can I do that? My utorrent version: 2.0 and the port used for incoming connections: 61829. My modem: Yaksu S200 ADSL router modem and I can reach its settings via web interface. I looked at the settings but they seem a bit complicated to me. Other info you may need to know: I have dynamic IP. I'm using Win7 x64.

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• Apache mpm-itk Performance

  - by Matt Beckman

  I manage a bunch of VPSs with memory ranging from 1GB to 8GB. Most of these websites are Joomla websites, and the servers must support multiple sites/users/S-FTP. I use mpm-itk almost exclusively (mostly due to it's convenience in these shared environments). However, I'm aware it isn't known for performance, so I need some advice on making it faster. Due to the lack of documentation when I first went the way of mpm-itk, I included only one setting in the config, and that was to limit each user to 50 clients (the rest I left up to defaults): <IfModule mpm_itk_module> MaxClientsVHost 50 </IfModule> Are there any better alternatives available? Are there any settings supported in mpm-prefork or mpm-worker that are also supported in mpm-itk? Thanks!

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• Performance Testing through distributed jmeter instances and bamboo

  - by user1617754

  I´m working on performance test for several services running in an Amazon network. Our architecture is: Continuous Integration server running in our facilities (Bamboo); A Jmeter server instance in the same network than the services to test; A Jmeter client connected to the JMeter server (ssh tunnels) in our facilities. I want to start the execution of tests from bamboo, and see the different results on it too. Bamboo with <---------> Jmeter server <--------> WebService Jmeter client on Amazon on Amazon Has anybody tried something like this?

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• Performance hit with new hard drive?

  - by aaaidan

  I've recently upgraded my laptop's internal hard drive from a 160GB to 1TB drive. I cloned the drive, then installed it. The general system performance seems appreciably slower. In particular application launches seem to take much longer. Is this possible, or am I just expecting too much from the new drive? It's running a Macbook Pro which is a couple of years old. Any ideas? 160 GB 7MB cache 5400 rpm NCQ (Hitachi HTS545016B9SA02) -- original drive 1 TB 8MB cache 5400 rpm SATA300 NCQ (Western Digital WD10TPVT-00HT5T0) Sisoftware links: Hitachi HTS545016B9SA02 Western Digital WD10TPVT-00HT5T0

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• Troubleshooting server performance with a hosted server?

  - by ProfessionalAmateur

  We are in a tough spot, we have a hosted server with the following specs: OS: Windows Server 2008 R2 Enterprise SP1 64bit Processor: Intel Xeon X7550 @ 2GHz (8 processors) RAM: 16GB The file system is on a SAN or NAS (not sure). We are seeing very odd issues where a user will open a 25MB .xslb file and it takes literally 60-120 seconds sometimes. The server is just dog slow for excel. Resources are not being pegged, CPU never jumps up, plenty of RAM... it's just oddly slow. Our host has been looking at the issue for several weeks with not much to show for it. Is there a utility I can run myself that will help trackdown our issue? I have found Server Performance Advisor V1.0 Any experience in using it? Our host is ultimately responsible for fixing this, but we are going on 1 month and our users are losing patience. Any tips would be helpful.

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• Improving terminal server performance for a specfic app

  - by Matt

  We have a windows 2003 terminal server running 2X application load balancign that is hosting a client's application that is accessed by around 50 users. Each user has there own database. The database is a file based database. The application is developed under Delphi so I think the database may be BDE based. As you can imagine, there is probably quite a lot of disk i/o. Here are some of the perfmon settings. Logged in users (average) 20 - 25 CPU Utilization (average) 80 - 100% Disk Queue Length (average) 1.6 % Disk time (average) 111 Page faults/sec (average) 1400 The application takes on average about a minute to load up. As usual, the budget is tight. Is there basic windows performance tuning tips that people can recommend to improve things before we fork out on more RAM etc. Server is a 2.8GHz Xeon with 3GB of RAM.

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• Disable Memory Modules In BIOS for Testing Purposes (Optimize Nehalem/Gulftown Memory Performance)

  - by Bob

  I recently acquired an HP Z800 with two Intel Xeon X5650 (Gulftown) 6 core processors. The person that configured the system chose 16GB (8 x 2GB DDR3-1333). I'm assuming this person was unaware these processors have 3 memory channels and to optimize memory performance one should choose memory in multiples of three. Based on this information, I have a question: By entering the BIOS, can I disable the bank on each processor that has the single memory module? If so, will this have any adverse effects or behave differently than physically removing the modules? I ask due to the fact that I prefer to store the extra memory in the system if it truly behaves as if the memory is not even there. Also, I see this as an opportunity to test 12GB vs. 16GB to see if there is a noticeable difference. Note: According to http://www.delltechcenter.com/page/04-08-2009+-+Nehalem+and+Memory+Configurations?t=anon, the current configuration reduces the overall data transfer speed to 1066 and in addition, the memory bandwidth goes down by about 23%.

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• SQL Performance Problem IA64

  - by Vendoran

  We’ve got a performance problem in production. QA and DEV environments are 2 instances on the same physical server: Windows 2003 Enterprise SP2, 32 GB RAM, 1 Quad 3.5 GHz Intel Xeon X5270 (4 cores x64), SQL 2005 SP3 (9.0.4262), SAN Drives Prod: Windows 2003 Datacenter SP2, 64 GB RAM, 4 Dual Core 1.6 GHz Intel Family 80000002, Model 6 Itanium (8 cores IA64), SQL 2005 SP3 (9.0.4262), SAN Drives, Veritas Cluster I am seeing excessive Signal Wait Percentages ( 250%) and Page Reads /s (50) and Page Writes /s (25) are both high occasionally. I did test this query on both QA and PROD and it has the same execution plan and even the same stats: SELECT top 40000000 * INTO dbo.tmp_tbl FROM dbo.tbl GO Scan count 1, logical reads 429564, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. As you can see it’s just logical reads, however: QA: 0:48 Prod: 2:18 So It seems like a processor related issue, however I’m not sure where to go next, any ideas? Thanks, Aaron

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• Raid0 performance degradation?

  - by davy8

  Not sure if this belongs here or on SuperUser, feel free to move as appropriate. I've noticed the performance on my RAID0 setup seems to have degraded over the past months. The throughput is fine, but I think the random access time has increased or something. In use I generally see about 1-5mb/sec when loading stuff in Visual Studio and other apps and it doesn't seem like the CPU is bottlenecking as the CPU utilization is pretty low. I don't recall what Access Time used to be, but HD Tune is reporting 12.6ms Read throughput is showing as averaging about 125MB/sec so it should be great for sequential reads. Defrag daily and it shows fragmentation levels low, so that shouldn't be an issue. Additional info, Windows 7 x64, Intel raid controller on mobo, WD Black 500GB (I think 32mb cache) x2.

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• Raid0 performance degradation?

  - by davy8

  Not sure if this belongs here or on SuperUser, feel free to move as appropriate. I've noticed the performance on my RAID0 setup seems to have degraded over the past months. The throughput is fine, but I think the random access time has increased or something. In use I generally see about 1-5mb/sec when loading stuff in Visual Studio and other apps and it doesn't seem like the CPU is bottlenecking as the CPU utilization is pretty low. I don't recall what Access Time used to be, but HD Tune is reporting 12.6ms Read throughput is showing as averaging about 125MB/sec so it should be great for sequential reads. Defrag daily and it shows fragmentation levels low, so that shouldn't be an issue. Additional info, Windows 7 x64, Intel raid controller on mobo, WD Black 500GB (I think 32mb cache) x2.

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• Improving Chrome performance on OSX

  - by Giannis

  There are a number of sites that do not display properly on Safari and I need to switch to Chrome. Although when the content of the sites requires flash player, Chrome will consume a significant amount of CPU. Running more than 3 windows, will cause my MBP to overheat, start the fans, and reduce battery life way more than Safari. What I am looking for is suggestions on ways to improve performance of Chrome running flash. I know Safari is optimised for OSX, but any improvement is welcome. Following I have a demo to display the issue. I am running same youtube video on Safari 6 and Chrome 21,both updated,at the same time. Both browsers have been reseted and have no extensions. This is run on MBP 13" 2012 with 2.9 i7 running OSX 10.8.1. p.s If any additional details can help please let me know.

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• Join performance on MyISAM and InnoDB tables

  - by j0nes

  I am thinking about converting some tables from MyISAM to InnoDB in my mysql server. The tables will certainly benefit from the change because a lot of write requests come to these tables, while there are also quite a lot of read request at the same time. However, they are often joined together with some tables that almost don't get any writes. Is there a performance penalty when joining together MyISAM and InnoDB tables or should everything work fine? Second question: During backups at night, I am copying data from the InnoDB tables to MyISAM tables for archiving purposes. In these backups, a lot of write-requests happen, however there is almost no read from these archive tables. Would these tables also benefit from using InnoDB or is this just a waste of space and RAM?

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• Database Performance Across 3 NetApp FAS2050

  - by bjd145

  I recently inherited a SQL Server 2005 box that has LUNs mounted on it from three different NetApp FAS2050 filers. The reason there are three is because the first two filers are out of space and our databases continually need more of it. What kind of performance impact (if any) does this setup have? Is it better to move the LUNs from the two other older filers to the newer one so that we have only one filer/controller for caching, etc ? This is in general. I apologize for not having more specifics.

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• MySQL & tmpfs : performance

  - by Serty Oan

  I was wondering if, and how much, using tmpfs could improve MySQL performance and how it should be done ? My guess would be to do mount -t tmpfs -o size=256M /path/to/mysql/data/DatabaseName, and to use the database normally but maybe I'm wrong (I'm using MyISAM tables only). Will a hourly rsync between the tmpfs /path/to/mysql/data/DatabaseName and /path/to/mysql/data/DatabaseName_backup penalize performances ? If so, how should I make the backup of the tmpfs database ? So, is it a good way to do things, is there a better way or am I losing my time ?

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• Silverlight and .NET 4 tools

  I've just added two new attributes to SharpToolbox.com: Built for Silverlight and Built for .NET 4. There are already more than 30 tools tagged as offering support for Silverlight, and 20 tools for .NET 4.You can search for tools, libraries and add-ins with these attributes using the search page. PS: if you have submitted tools, be patient, I have a lot to process......Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• xinet vs iptables for port forwarding performance

  - by jamie.mccrindle

  I have a requirement to run a Java based web server on port 80. The options are: Web proxy (apache, nginx etc.) xinet iptables setuid The baseline would be running the app using setuid but I'd prefer not to for security reasons. Apache is too slow and nginx doesn't support keep-alives so new connections are made for every proxied request. xinet is easy to set up but creates a new process for every request which I've seen cause problems in a high performance environment. The last option is port forwarding with iptables but I have no experience of how fast it is. Of course, the ideal solution would be to do this on a dedicated hardware firewall / load balancer but that's not an option at present.

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• RAID P410i and P812 performance issues

  - by Alexey

  I'm having much trouble with I/O performance of HP DL360 server with two RAID controllers - P410i and P812, Windows Server 2008, 36 GiB RAM and 16 x Intel Xeon x5550. The server runs a bunch of tasks producing heavy sequential I/O, and after about 20-30 minutes of intensive work it looks like the tasks are stuck, not using CPU and with enough free memory (so this cannot be a bottleneck). The same tasks were running quite well on the older server (Windows Server 2003, 4 x Intel Xeon, 12 GiB RAM). RAID cache is present, write-cache battery is installed. Cache is configured as 25% readahead/75% writeback. The swap file resides on the logical disk served by P410i and other logical disks are on P812. Can someone tell me what can be the matter of this? Is this a hardware problem or misconfiguration?

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• Hyper-V R2 Performance Counters

  - by Ascendo

  Hi all I've been playing around with the WMI performance counters for Hyper-V. Of interest to me are the Virtual NIC bytes/sec input and output counters. I notice that the results are very "spikey". Over what time period is the latest counter averaged? I'm trying to calculate total traffic volume per VM, but sometimes a very high instantaneous poll result is inflating the result as I only poll the result each minute. I would prefer to read a 'bytes total' counter instead of a 'bytes/sec' counter - is there such a thing? Thanks Acendo

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• How to open ports on router for better torrent performance

  - by Mehper C. Palavuzlar

  I've been using utorrent to download and upload torrents for a long time. Recently someone told me that I need to open port(s) for utorrent from my router settings for better downloading and uploading performance. Is it true? If yes, how can I do that? My utorrent version: 2.0 and the port used for incoming connections: 61829. My router: Yaksu S200 ADSL router modem and I can reach its settings via web interface. I looked at the settings but they seem a bit complicated to me. Other info you may need to know: I have dynamic IP. I'm using Win7 x64.

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• Using LDAP Attributes to improve performance for large directories

  - by Vineet Bhatia

  We have a LDAP directory with more than 50,000 users in it. LDAP Vendor suggests maximum limit of 40,000 users per LDAP group. We have number of inactive users and those are being purged but what if we don't get below the 40,000 users? Would switching to using multivalued attribute at user record level instead of using LDAP groups yield better performance during authentication, adding new users, etc? I know most server software (portal, application servers, etc) use LDAP groups. But, we have a standardized web service interface for access control instead of relying on server software to map LDAP groups to security roles. Each application uses this common "access control web service". Security roles are used within application to build fine-grained ACL used within each enterprise application.

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• How to improve performance of ubuntu server 10.04 for my dms system?

  - by prasanna

  I will be using one of the dms (document management system) which is java + jackrabbit + postgresql + jboss + openoffice based on ubuntu server 10.04. this is the only application i will running on my server. i want to speed up the performance of the system for this. can you give me tips for improvements of ubuntu server? can i change any settings which give fast system performance. My application will be used concurrently by around 70 - 80 people. We have total 600 users. they will constanly upload , download the files in dms. i am going to use dedicated dell server with minimum 4 gb of RAM. i appreciate help. thanks and regards, Prasanna

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• why is iometer performance slower after first run?

  - by Dan

  I'm doing some benchmarking with IOMeter, and I'm seeing a consistent and susbtantial drop-off in performance after running the first test. These drop-offs are about the same on the three systems I've tested on, which makes me think it's a configuration setting, or just a fact of life about using IOMeter. For example, one system (local RAID 10) went from 388 I/Os per second the first run, to about 211 I/Os per second on every run after that. Everything else about the test was identical, and I also bounced the machine in between runs. So, is this expected behavior, or am I missing something?

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• Can USB Hubs affect peripheral performance?

  - by Daniel Rasmussen

  Like many laptops, mine has 2 USB 2.0 ports. I'm looking to purchase a USB hub for my peripheral devices. I'm also planning on purchasing a laptop cooler with two USB powered fans, which connects to a USB port but can extend the plug, so it doesn't use one up. (Sorry for the poor description; see the link for a picture.) My questions are these: Can one plug 'too many' peripherals into a USB port? Can I plug my fans into a port, then the hub into the fans, then my keyboard and mouse, mic, and webcam into the extender..? Is it possible to draw too much power from a port? Secondly, will a USB hub affect the performance of any of my devices? I'm mostly worried about my mouse and keyboard. I like wired mice because I've noticed some lag in my Bluetooth mouse.

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• Slow performance over network (Ubuntu)

  - by Filipe Santos

  i did setup this NodeJs TCP Server and tested it with a message flooder. Just to see how the performance of the server is. While the message throughput is great if i run the server and the message flooder on the same computer (ubuntu), the throughput dramaticaly decreases if i start the server on computer1(ubuntu1) and the message flooder on computer2(also ubuntu). Both PC are on the same network. In fact, they are directly connected to each other. I started searching the internet for reasons and i suppose i need to tune TCP on both Ubuntu-pcs but until now i haven't been successfull at all. Has anyone experienced such problems, or could someone help me out? Thanks Here the flooding code: var net=require('net') var client = net.createConnection(5000, "10.0.0.2") client.addListener("connect", function(){ for(var i = 0; i < 1000; i++) { client.write("message "); } })

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