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

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0
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70 views

apache 2.2 to 2.4 sporadic performance drop

I updated apache from 2.2 to 2.4 and php from 5.3 to 5.4. For some reason I am experiencing huge performance drops in around 5% of requests to the server. On average, sites load in less than 2 seconds ...
0
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0answers
14 views

Conservative Azure Windows VM to Run SQL Server 2008 R2 [duplicate]

For testing purposes I need to set up three Azure Windows VMs to each run an instance of SQL Server 2008 R2 each holding one DB of approx 100GB. There will be quite a few complex stored ...
0
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0answers
25 views

Performance monitors

I would need to create a performance monitor on windows server 2012 R2 to monitor the following for a particular period(may be one hour) CPU usage Memory usage Network bandwidth I'm little ...
0
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0answers
45 views

Sudden increase in my CPU usage during random moments(Win Server 2012)

At random times, no matter if I am online or not I see that my server having increased Process usage spikes, as you can see in the picture: So I go inside the Dashboard on the Server Manager, look ...
2
votes
3answers
166 views

Apache - drawback to high number of httpd processes always running

Is there any issue with having a high number of spare httpd processes always running? I ran a test where I increased StartServers and MinSpareServers by 1,000 and measured the increase in memory ...
1
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0answers
191 views

VMWare ESXi and iSCSI via FreeNAS

I've recently been setting up a sandbox ESXi environment with a VM running FreeNAS providing a volume which is connected as a datastore on the host via iSCSI. I've created a VM on this datastore and ...
2
votes
1answer
421 views

Nginx performance when running multiple instances on the same machine

I'm trying to understand the performance impact of having multiple nginx instances (masters) running on the same machine, rather than having them all load into a single instance using different server ...
-1
votes
1answer
31 views

Is there a way to determine what impact an upgrade will make other than benchmarking it myself? [closed]

Several posts on capacity planning tells me that the only way for me to determine what hardware I need is to test it myself and benchmark it. Benchmark your code on hardware similar to what you'll ...
1
vote
1answer
41 views

RAID1 write penalty using mdadm - what's the cause?

When doing some performance tests writing to a SSD-based 3-way RAID 1 mirror powered by mdadm, it appears we suffer a significant write penalty of about 2.2x slower than doing the same test on just ...
1
vote
2answers
527 views

Can one root server handle over 50M requests per month? [duplicate]

I am running a LAMP Application installed on one server, happily serving about 1M PI per month. Now I am looking into a potential partnership where my app might serve around 50-80M requests per month. ...
1
vote
0answers
139 views

100% CPU, load average 0 - how is this possible?

Here's the top output: top - 19:20:47 up 1 day, 4:30, 1 user, load average: 0.01, 0.07, 0.12 Tasks: 170 total, 1 running, 169 sleeping, 0 stopped, 0 zombie %Cpu(s): 0.6 us, 0.9 sy, 0.0 ...
1
vote
0answers
19 views

Force disk cache even if guest uses direct i/o

Have IBM db2 on Rhel on Hyper-V on Windows Server. The *.vhdx file is on CSV. e.g. C:\ClusterStorage\volume1\hyper-v\oktest-lb1\oktest-lb1.vhdx. db2 uses O_DIRECT flag (uncached i/o) for its database ...
1
vote
1answer
44 views

Different network speeds from servers on same subnet

I have a pretty strange issue, I'm looking for advice on how I can debug it. I have two servers (A) and (B) on the same subnet and switch. Server A->B transfers at a full 12MB/s and vice-versa. ...
1
vote
0answers
43 views

How to track down bad performance on an api-server

If my api-server shows bad performance, such as high cpu - can this be blamed on the service or on the server? If a regular app-server shows bad performance, all I can do is track down the methods ...
0
votes
0answers
23 views

SSD vs RAM - Optimal ratio for different data sets / databases [duplicate]

I am looking for an advice or even better some studies / benchmarks to read for different scenarios (data sets) when it comes to the best ratio between actual RAM and SSDs. I know that fitting the ...
2
votes
2answers
372 views

ZFS reads on FreeBSD incredibly slow

I have a FreeBSD 10.0 system on which I have MySQL running with its InnoDB database files stored on ZFS. It seemed to have been going fine for months, but lately, and seemingly suddenly, performance ...
0
votes
0answers
154 views

vSphere | VMs are balooning and swapping | sched.mem.max paratmetar does not exist

I have two VMs in ESXi5.5 environment that are swapping memory. After a long research I found out the below two articles where it is explained that one must compare the values of memsize and ...
0
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0answers
56 views

How can I adjust buffer settings when using xbootmgr?

I am trying to analyze our clients which suffer from long boot & logon delays, so I installed Windows Performance Toolkit. This is the command line I have used to capture a startup: xbootmgr ...
0
votes
0answers
16 views

How to estimate max request per second of web servers? [duplicate]

I'm planning on a system that handles quite a huge amount of requests per second (say 500,000 requests / second). How to estimate maximum request per second of my web server can handle (so that I can ...
2
votes
2answers
103 views

Migrating Vmware to Hyper-V - number of Virtual CPU

I'm performing a migration from VmWare to Hyper-V and the Virtual CPU that you are assigning to a Virtual Machine is different and I'd like to know what should be the equivalent values when we move a ...
0
votes
1answer
111 views

Sata Disk very poor performance

I have a HP MicroServer NL54, stock BIOS, with 4 HDs Seagate Barracuda ST2000DM001 2TB 7200 RPM 64MB Cache. If I run a dd benchmark I get: $ dd if=/dev/zero of=/dev/sdb bs=4K count=4096 4096+0 ...
-2
votes
1answer
52 views

Servers in different DC's - performance impact

Today Linode eat my nerves completely by shutting down main DB server for 25 minutes due to their internal network problems. Right today I was going to set up another one server at linode to set up ...
0
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1answer
138 views

HP ProLiant BL460c Configuring Memory

I hope you can help me. I need to install 48GB of RAM in an HP BL460c G1. The CPU is 48W, and I've researched the specification and I can do it for this kind of processor. I've also read the basic ...
0
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0answers
28 views

KVM Virtual Machines and Public IPs

I currently have some Virtual Machines on my business dedicated server using the KVM layer as apposed to Xen or other virtualization methods. I was wondering if I could get a "best practice" on ...
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votes
4answers
200 views

MYSQL - is LOCALHOST speedy than i.e. (domain) mysql.domain.com [closed]

I am interested, on some hosting(although they are paid hostings, for example, DreamHost. probably 000webhost too), in database server, you have to insert: mysql.domain.com (instead of: localhost). I ...
3
votes
0answers
54 views

NGINX Worker Process, Burst Read Speed to only 1918kb/s

I am running an NGINX/1.8 server on Centos6.6 with multiple worker_processes, however while observing iotop I notice they burst up to 1918kb/s Read speed and rarely if at all pass that limit. I want ...
4
votes
2answers
830 views

NGINX Serving Large mp4 Files extremely inefficiently

I am currently running nginx/1.0.15 on a Centos 6.6 OS. The server has the following specs: Intel(R) Atom(TM) CPU C2750 @ 2.40GHz (8 cores) 32GB Ram 5 x 6000 GB 7200 RPM (Raid 10) The Problem The ...
1
vote
1answer
46 views

postfix SMTP outgoing gateway server, Software RAID1 vs RAID1 + RAID 0 on 2 disks

I have this old smtp server that is currently running Windows 2003 and with EOL I want to move it to something that will continue to get security upgrades but at same time I want to improve ...
0
votes
1answer
111 views

MySQL slow connection

I am running a laravel application that is on a separate server than my MySQL database. If I run the query on the Mysql server it takes the expected 0.00 - 0.01 seconds to return. However when I log ...
1
vote
1answer
128 views

Use in-memory database or search engine for read only to make website faster

I have an application which require doing a lot of queries for every single page which make it slower. I have tried to use cache systems (Redis) but implementation are little bit complicated and will ...
1
vote
1answer
852 views

nginx loading page very slow

I just deployed nginx in a new environment with the same configuration that I've used previously and I am seeing some very odd behavior. Nginx is configured as a reverse proxy for Solr, when I try ...
3
votes
1answer
128 views

How to find source of system running slow clock?

I've a problem on one of my Gentoo server. After some time, the clock starts running very very slow. It takes about one minute for one second to go. The major problem is that not only the clock is ...
2
votes
1answer
81 views

cloud server performance vs same specification dedicated server?

I have a web application written in php (5.6.10) and using Postgresql (9.4) we have about 4k users per day and about 20k page views per days, my main issue that we are running in cloud host with 2 ...
5
votes
2answers
307 views

cpufreq-info differs from /proc/cpuinfo?

I have a server and I want to ensure it's always running at maximum speed, never in energy-saving mode. I've tried a few strategies (aside from rebooting and changing the setting in the bios, which I ...
3
votes
2answers
235 views

Performance azure disks, high average queue length

I'm having a classic developer-system admin battle where I am stating that there is an IO problem on the disk of the shared sql server while the system admin tells me that the capacity hasn't been ...
1
vote
2answers
215 views

PHP5-FPM pm.max_children affect RAM or CPU+RAM?

Recently inherited a Nginx+PHP5-FPM server, and I'm learning and trying to optimize PHP5-FPM settings. Server info: 4 CPUs (8 threads) 7.5 GiB RAM PHP5-FPM info: pm.max_children = 5 ...
-2
votes
2answers
112 views

Is it normal to have 400~600ms of waiting for first byte? [closed]

I have optimized my website and apply many advices found on the Google search. but finally i have about 400~600ms of time to first byte. Does it normal or I can lower it? For dynamic data it it about ...
2
votes
1answer
170 views

Nginx: Optimal map_hash_max_size and map_hash_bucket_size for 1M map?

I have 1M static rewrite rules and using this map configuration. How to determine the optimal values for map_hash_max_size and map_hash_bucket_size? I want to optimize for memory consumption. The ...
1
vote
1answer
92 views

nginx no speed limitation for a connection

I have a server with nginx installed on it to serve some files for downloading. I also didn't change default configuration of nginx. Problem is that when I try to download from this server it seems ...
0
votes
0answers
196 views

Slow FTP download speeds on Synology DiskStation

We just got a Synology DS2415+ NAS which is connected to internet via a FIOS 300/300mbps connection. I am testing download speeds from a remote location with a 200mbps download connection. When ...
1
vote
0answers
95 views

IIS hanging when running Active Reports, possibly splwow64.exe

We have a Windows 2008 R2 web server running our web app on IIS and when running a particular page which generates a PDF (using Active Reports https://activereports.grapecity.com/) it takes between 1 ...
3
votes
1answer
143 views

NFSv3 client differences in read/write performance

I'm taking care of a few servers that make relatively heavy use of a NFS filer. At crunch time a single server sends about 2k reads + 2k writes per sec to the filer. According to nfsiostat at these ...
2
votes
1answer
182 views

Unexpected File Download Slowness After Enabled SPDY on Nginx

A simple WordPress static site run entirely on https. Nginx conf here: http://pastebin.com/BrP0LThT Only difference before / after is: listen 443 ssl; listen 443 ssl spdy; Nginx ...
1
vote
0answers
16 views

What is involved in adding ZFS cache stats to orca?

I am interested in looking to add ZFS cache stats into existing orca performance monitoring that we have. Particularly, I am interested in the output of echo ::memstat | mdb -k Am still in the early ...
1
vote
2answers
634 views

Optimize Linux file system for reading ~500M small files

We're seeing performance problems on a file system that contains ~500 M files that are relatively small (typically tens of kb) and ~150 K directories. Files access is predominantly reads and writes ...
0
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0answers
9 views

Does Intel's FlowDirector work for multicast traffic?

FlowDirector works by sampling outgoing packets, and establishing a core<->flow association so that when packets come in, it can lookup which core to send it by way of the usual RSS 3 or 5-tuple. ...
0
votes
1answer
189 views

Delaying packets with libnetfilter_queue

From my Raspberry Pi configured as an access point, I set the following rules: sudo iptables -I FORWARD -p tcp --sport 25 -j NFQUEUE --queue-num 0 sudo iptables -I FORWARD -p tcp --sport 80 -j ...
7
votes
1answer
465 views

Why is FileZilla so much faster than PSFTP?

I'm using FileZilla 3.10.3 and PSFTP 0.63 (PuTTY). Can anyone help me figure out why the throughput I get is so drastically different between the two clients? It can't just be a shortcoming of the ...
1
vote
0answers
108 views

Why a VPN slows down LAN access?

We have an access server providing VPN to some of our clients and the workforce with laptops. They usually connect from outside of the office, and everything works fine. However, for simplicity and ...
6
votes
1answer
294 views

4X10GB Bonded NIC - only producing 4-5GB throughput

I have Two HPBL685c G6 blade servers running Ubuntu 15.04 Each server has 4X10GB NIC 2x10GB NIC are connected to a single VirtualConnect 10/10G Ethernet module The other 2x10GB NIC are connected to ...