Questions about server hardware and software performance, or network performance.

learn more… | top users | synonyms (2)

-1
votes
2answers
674 views

Bad disk performance on m3.medium (SSD) EC2 instance [closed]

May be I'm missing something but at a glance new SSD-based m3.medium EC2 instance doesn't provide any disk performance advantage. I didn't run benchmark tools yet, but directory copying, directory ...
-2
votes
4answers
154 views

Too many httpd processes on my Cpanel VPS [closed]

For months my VPS has been doing fine. But since last week I saw Mysql server stopped two times and I was told that it was some load issue. I don't want to upgrade due to budget issue. Yesterday when ...
0
votes
0answers
19 views

Typical web browsing profile

I am looking for a typical profile of a one day browsing session. The end goal is to realistically simulate a web proxy traffic in a mobile network. Of course the best would be to find some kind of ...
2
votes
1answer
50 views

Server load avg. hitting 16-20, but all resources under 90% usage?

As you can see in the image shared below, the server load peaked to almost 20 but the CPU, RAM, DISK IO and Network I/O remained well under their full capacity. My question is: 1). What caused the ...
1
vote
1answer
66 views

Intermittent performance issues on Azure Web Application with ASYNC_NETWORK_IO errors

Our web application is suddenly experiencing intermittently slow performance (slow page loads, slow ajax calls going from <1 sec to over 20 secs). The only clue is when the application slows, we ...
0
votes
0answers
8 views

Boost up performance of Rails application on Ubuntu [duplicate]

I'm trying to configure my ubuntu server to serve as many as possible concurrent connection. My application is built on RoR and it takes about 30ms to serve a request in average. I also use fushion ...
0
votes
0answers
28 views

Dual Drive Failure and server restore slowness on Windows Server R2

I recently had a hosting company that had a dual drive failure within 6 minutes of each other, not sure how that could even happen. However they had to restore a backup of the server last night. ...
0
votes
1answer
86 views

Linux unfriendly IIS/ASP.NET :-) : Quick download on windows but slow on linux [closed]

This particular web site (gops.tay.be) serves objects quick if I try to request the page using windows, but I get them very slow if trying using linux. There is no difference if I use browser or curl: ...
-1
votes
1answer
49 views

Does not measuring performance improve performance?

Running the Task Manager or Resource Monitor or even simply viewing the status of a network connection indicates the system is constantly tabulating a large number of performance metrics. It must ...
0
votes
2answers
33 views

Distribute all services between 3 VPS [closed]

i just rent 3 vps servers with this: 4GB RAM 150GB hard disk 2 CPU 6 ip address so we have vps1, vps2 and vps3 and i'm thinking distribute the services like this: VPS1 - frontend + DNS Server + ...
1
vote
4answers
219 views

Heavy production MySQL/Percona Database in openvz container

So I'm currently running a MySQL 5.1 database, with the following specs: Proc: Intel(R) Xeon(R) CPU E5-1620 0 @ 3.60GHz RAM: 64 Go disks: 2x 100 Go SSD (RaidSoft) I'm planning to migrate my ...
-1
votes
3answers
232 views

How can be ping used to measure a server speed? [closed]

When I ping myserver.com, I get this responses: 64 bytes from XXX.XXX.XXX.XXX: icmp_seq=1 ttl=242 time=52.6 ms 64 bytes from XXX.XXX.XXX.XXX: icmp_seq=2 ttl=242 time=55.9 ms 64 bytes from ...
0
votes
1answer
117 views

Randomly slow MySQL queries

I know this type of question come often. But I have done a lot of research, tried a lot of different settings, but still have the same issue: queries that usually are very fast can take 3s to 5s ...
2
votes
0answers
425 views

Very poor disk performance on KVM node - mdadm raid10

For a long period of time, i'm experiencing performance issues on CentOS servers that are used for KVM virtualization. I'm running software RAID-10 with 4 disks (Seagate ST2000DM001, 2TB, 7200rpm ...
0
votes
2answers
100 views

Graceful way to rsync millions of files between two local folders

I want to rsync a folder with millions of files from a local directory to another, on a daily basis. The files themselves change very rarely. I want to reduce the impact on the running server, e.g. ...
0
votes
2answers
33 views

Apache Configuration not use server capabilities

I have a web server with 16 GB of RAM. The server has a good traffic and have pics of 300 simultaneous requests. Unfortunately when these peaks arrive queries fall into error or are very very slow. ...
2
votes
0answers
67 views

How to debug sluggish process performance

I have a test application which writes a string to a file 10000 times. I run this on two servers and I get totally different results. [SYSTEM 1] $ time ./test_depth real 0m0.152s user ...
0
votes
0answers
57 views

Are there any performance benefits when using Redis caching combined with Nginx caching?

I came across these posts about putting Redis in front of Nginx. I also noticed the Nginx HTTPRedis module. Which seem interesting from a performance standpoint, but I don't have much experience in ...
0
votes
1answer
759 views

Is it possible to use SSD for storage on Windows Azure?

There is some marketing-speak suggesting that it may be possible ..: http://gigaom.com/2012/06/05/new-windows-azure-goes-all-ssd-to-one-up-amazon-in-the-cloud/ .. but I couldn't find any way to ...
1
vote
1answer
156 views

Why WHM, New Relic and SSH memory usage statistics different?

I have a Cent OS 6.4 Apache Nginx VPS. I have WHM cpanel. How do I check past 24 hours or 48 hours this server RAM usage? I use new relic server monitor web application. It reported that, this VPS ...
0
votes
0answers
39 views

What is a good set of performance counters to measure scalability bottlenecks

We're moving our enterprise product to the cloud (IAAS) and are determining how many users we can support on a single VM. Our product uses SQL Server, SharePoint and a bunch of WCF services. What ...
1
vote
0answers
32 views

How do I reduce server load for a dormant WordPress site using W3 Total Cache?

My current host who did all performance optimization for me has jacked up their price to $1,000/month, so I was forced to move to a new host. The new host charges only $150/month. They give you W3 ...
0
votes
0answers
28 views

How to benchmark a whole storage infrastructure

I'm a 100% sure that I'm not the first one to consider benchmarking a whole infrastructure, but yet I haven't found any relevant information on how to face this challenge. As I guess we all know what ...
0
votes
1answer
239 views

HTTPS overhead compared to HTTP

HTTPS is the encrypted version of HTTP, and nowadays it is becoming a common practice to encrypt all the web traffic, not only sensitive one. The drawback of HTTPS, apart from the need to buy ...
0
votes
1answer
37 views

Wireless performance, normal results

Here is the setup: An IBM server machine connected to a TP-Link TL-WR1043ND (latest firmware). It is connected with a wired gigabit connection. An lenovo laptop with a centrino wireless-n 2230 and a ...
-1
votes
2answers
39 views

What exactly is controlling single HTTP requests speed? [closed]

As you may know using multiple HTTP threads when downloading a file from a server can significantly increase your download speeds if not max it out. What is control of determine the throughput of ...
2
votes
1answer
122 views

My Ubuntu VPS is not using available swap, even if OOM. What to do?

I recently added 1 GB of swap to my Ubuntu virtual private server to prevent MySQL crashes on RAM overloading. I followed this tutorial. I use htop to monitor resources. When I use loadimpact to test ...
2
votes
4answers
587 views

LSI RAID: Write cache policy affects read performance?

I have a server with a LSI MegaRAID SAS 9260-4i controller, RAID-5 with 3 x 2 TB disks. I did some performance testing (with iozone3) and the numbers show clearly that the write cache policy affects ...
1
vote
1answer
44 views

Advice on web server performance troubleshooting is needed

I'm renting a virtual CentOS based server where I have about 5 active sites running. Several months ago I noticed a significant performance degradation in how my sites are running. First symptom was ...
0
votes
2answers
79 views

How to tell which script is slowing down the server the most?

As it happens often to coders, I had to take over someone else's code for this company, the server runs on Amazon Cloud (i2.xlarge) running ubuntu-saucy-13.10-amd64-server. (the guy left) The ...
1
vote
2answers
168 views

Why does dd show slow disk speed first time?

I'm checking the disk speed of a hdd on CentOS 6 using dd command. The setup is a DRBD setup - with this server being primary. To ensure that I get correct values, I execute the dd command 3 times ...
-1
votes
2answers
642 views

Poor SQL performance on HP ProLiant ML310e Gen8 v2 with raid10

I recently bought HP ProLiant ML310e Gen8 v2 server with 8G's RAM and 4 HP 1TB 6G 7.2k rpm SATA (3.5in) Non-Hot Plug MDL HDD disks. It was surprise to me that HP didn't provide debian drivers for ...
4
votes
2answers
287 views

Importance of disk alignment for Windows Server 2012

I saw article about Disk alignment here and also here.Also there where some references that windows server 2003 has some problem with disk alignment. After reading article I am confused whether we ...
1
vote
0answers
107 views

Why are pgpgin/s and majflt/s inconsistent in sar -B?

In sar -B ouptut, I would naively expect pgpgin/s to equal majflt/s multiplied by the system page size. From man sar: pgpgin/s Total number of kilobytes the system paged in ...
-1
votes
1answer
39 views

Firewall Connections fail to open under load

Problem : During High load , our applications are encountering errors : java.net.connection Time out. After some investigation , we found out that it was Firewall the root cause, but still don't know ...
0
votes
1answer
27 views

Slow application performance in one location

We have a problem that perplexing both of us in our department. We have a video viewing application that we need to have loaded on a workstation to be used in a particular location. When we load a ...
0
votes
1answer
95 views

Using all host resources for a single Windows VM (KVM) - how to improve performance

We're using KVM/qemu on Ubuntu 12.04 to spawn a Windows 2008 R2 VM that uses a lot of host resources (all CPU cores, 4GB RAM). It seems that during a Windows boot that Windows allocates all its ...
2
votes
1answer
71 views

How Long Should Data Collection Sets run in Windows Server Performance Montioring

I currently have an application server and a database server both running on Windows Server 2008 R2. I have been tasked with generating a weekly report on the utilization of CPU, Memory and Disk. I am ...
0
votes
1answer
41 views

uk vps server route to thailand? [closed]

I'm just a Javascript developer using node.js... My host has got me a vps sever in england. I have had someone test my site loading in england and it is lightning fast. I've also had someone test in ...
0
votes
1answer
208 views

High CPU load caused by slow disks?

We are running a online application on a 3-year old server (quadcore Xeon, 4GB RAM, SAN-disks). The server hosts besides the web application a SQL-, FTP-, SFTP, SMTP, and POP-services. Over the years ...
1
vote
1answer
75 views

Performance impact of slower encryption/hash/group settings in Phase 1

When defining IPSec VPN tunnels, how much of a performance impact can I expect from choosing "stronger" Phase 1 settings (such as AES256/SHA1/DH5 over DES/MD5/DH1)? For example, I'm told that AES-256 ...
0
votes
1answer
39 views

Loss of performance on backup power

I tested my system on backup and saw considerable degradation in performance when running on backup. Here are the results: Config: CPU: 2.0 Ghz, 6 Core, 12 Threads RAM: 16 GB UPS: 600W/ 1000VA PSU: ...
0
votes
3answers
195 views

Does software RAID-0 really improve performance?

I am going to lease a server and I have two options, SATA or SSD, I decided to save the money and go for the SATA option. But I do not need all that storage they are giving me! So I thought MAYBE I ...
2
votes
0answers
118 views

mdadm raid10 or nfs performance issues?

I have a fresh mdadm RAID10 device which is healthy, built from 4 x 7200rpm SATA 3 drives: # cat /proc/mdstat Personalities : [raid10] [raid1] md2 : active raid10 sdc3[5] sda3[4] sdb3[1] sdd3[3] ...
2
votes
0answers
67 views

Infiniband link is at 4X SDR with DDR HCAs; has anyone seen this before?

I've recently upgraded my Infiniband HCAs from SDR to DDR, however upon upgrading, it has not improved the link speed at all. Receiving the following output from 'iblinkinfo': CA: ip-san-1-au3a ...
0
votes
1answer
86 views

Website is slow without https

As you can see, http://coinad.com/ is slow, and https://coinad.com/ is fast. I've upgraded the server, reviewed the code, optimized the tables and anything seems to work. This is driving me mentally ...
4
votes
1answer
205 views

iSCSI TGTD over InfiniBand Performance

I have just configured a server-to-server 4x SDR InfiniBand link to increase bandwidth for the backend storage of my virtual machines, specifically a database server. I am using iSCSI with TGTD on ...
1
vote
1answer
85 views

Choosing the right database/storage engine for iptables ulogd

I'm looking for some help choosing a database backend for a iptables ulogd setup. We are going to swap out our current proprietary firewall solution with iptables and one of the requirements is to ...
8
votes
3answers
212 views

Adding CPUs puts MySQL 5.5 (Debian) performance down

I am about to setup a database server (MySQL) in OpenVZ container and I've been wondering how many CPUs I should assign to it. I decided to benchmark it. I compared two OS/MySQL distributions and ...
1
vote
1answer
267 views

3ware card in RAID-5 configuration slow and causes load when writing

I have a 1Gb/s bandwidth between my computers. The source can actually read and send data at 25MB/s via SSH. My test file is 4GB, I use scp without compression for the test transfer. The rate is ...