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Questions tagged [performance]

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

0
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2answers
34 views

RAID1 vs RAID5: read performances of a 2-disks array

I'm testing some RAID setups built with mdadm. This is about parallel reads on a 2-disks array. RAID1 seems to balance the reads by process, some sort of coarse-grained balancing, so reading the ...
2
votes
2answers
39 views

ZFS performance with databases and more than 80% space used

We have Oracle 11.2 databases on SAN storage (fibre channel on EMC) with Solaris 11.3. For the development environments, the space used on the filesystems is over 80% most of the time. How important ...
1
vote
1answer
36 views

Incredibly slow file copy speed on Virtual Machine

I've noticed one of our web servers has incredibly slow disk drive speed when copying files. The server is a bare metal Dell server hosting a single VM (virtualized mainly for backup and DR purposes)...
3
votes
2answers
35 views

AMD Epyc, occassional crappy performance

I'm working on a 2x AMD EPYC 7451 server, with scaling governor set to performance, yet there are issues when the server is under low load. When the load is low all the cores are basically downscaled ...
2
votes
1answer
60 views

Can consumer SSD over-provisioning improve performance?

While reading up on ways to improve SSD endurance, I came across an Intel whitepaper on the subject of SSD over-provisioning (limiting the host-adressable space on a drive or not including some of the ...
-1
votes
2answers
64 views

Making AWS cheaper by simultaneously deploying my own server [on hold]

As a start-up with very low cash flow, I am thinking about deploying my own server and combine that with AWS cloud, just in the beginning. Trying to do some of the heavy and costly operations on my ...
1
vote
0answers
28 views

Hard disk with xfs file system has bad write performance in subfolders

Our server has a raid6 array (10+2 disks, each disk is 6TB/SATA/7200rpm). We plan to make it an NFS storage shared with other clients. However, the writing speed is very slow: [root@Server ~]# mkfs....
1
vote
1answer
23 views

When using DNS from another continent, will IP's and CDN's reflect host country as well?

Lets say I am using Russia’s Yandex DNS from Canada, or America. Will I be served IP's and CDN's that reflect the host country of said DNS? And will they tend to be nearer to that nation?
0
votes
0answers
24 views

Bandwidth and IO issues when running hardware raid and zfs

I've inherited a setup using Linux Ubuntu 14, a megaraid_sas, and ZFS. We're getting some performance problems (never being able to fully utilize the 6GB bandwidth from the raid) and I'm curious if ...
1
vote
1answer
32 views

How to monitor data transfer speed and volume between two computers on same network

My application on Win2012 Server stores its cache on a ZFS appliance in the local network, during peak load we are seeing some performance degradation, this only happens in the production environment ...
0
votes
1answer
24 views

Apache-PHP slow page in one virtual host causes performance degradation or timeout on other

I have multiple PHP applications running under different virtual host on an Apache server. Each application uses MySQL as backend. Each application uses different MySQL servers in the same data center....
3
votes
4answers
128 views

Nginx thousands of server config files very slow to reload (nginx -s reload)

I have one master nginx.conf where I include the rest of my servers (sever blocks) with the include directive: include myservers/*.conf; My problem is when I have a new configuration file in ...
-1
votes
0answers
30 views

PostgreSQL Cluster with Synchronous Replication on RAM Disks

Has anybody tried it? I would like to know what is the expected overhead of the synchronous replication in a 3 node cluster where all the nodes are running entirely on RAM disk. My concern is that ...
1
vote
0answers
37 views

Difference in utilisation reported by iostat for two identical disks in RAID1

I'm trying to debug some weird behaviour with Postgres performance and am trying to understand the iostat output. I'm on 2x SSD on RAID1. Why would one of the disks be reported at ~21% utilisation ...
0
votes
1answer
43 views

CentOS 7.4.1708 kernel issuing sub-optimal device read sizes

I have a system running CentOS 7.4.1708, with uname reporting kernel 3.10.0-693. I needed to profile some aspects of disk performance, and so I wrote a basic C program that would use functions in the ...
0
votes
0answers
10 views

setting expire headers seemingly not working

I am trying to turn on my expire headers. I'm running a CENTOS 6.10 kvm with whm v70.0.62. In easy appache 4 i installed the mod_expire 2.4.37-1.1.2.cpanel. Then in my .htaccess I put this script: ...
7
votes
3answers
124 views

How to make rsync of ~2M files from remote server performant for regular backups

We have a large amount of files on a remote server that I'd like to setup regular backups to a local system for extra redundancy. Some details: Remote system is not in my control. I only have SSH/...
2
votes
1answer
49 views

Scaling up / reorganising VPS infrastructure for SMB

I work for a digital agency, where we design, build and host websites for our (local) clients. Currently, we have approx. 80-90 sites scattered on 11 VPS instances. 99% of those sites is WordPress ...
1
vote
2answers
87 views

Is it possible for Windows clients to carry out external queries through an alternative DNS server directly?

Our Windows domain is far away. DNS performance is affected. Would it be possible for Windows clients to carry out external queries through an alternative DNS server directly? I understand this is not ...
0
votes
0answers
120 views

OpenVPN Connection very slow. Server located in Hong Kong, and Client Desktop is in New York

I have a OpenVPN vps server in Hong Kong. The specs is just 1 Core 2.2ghz CPU and 1GB of RAM. The connection is a 100mbit. But when I connect from my desktop in NY, my speed is only 1-2mbit only. I'm ...
0
votes
0answers
10 views

typeperf disk write log interpretation

When running typeperf utility to get total disk write. typeperf -si 2 "\LogicalDisk(_Total)\Disk write Bytes/sec" I get results in the format "01/11/2019 01:29:40.674","58066.696363" what is the ...
1
vote
1answer
65 views

HTTP/2: speed vs. security

As a measure for speeding up of webpage loading times i recommended to switch over from HTTP1.1 to HTTP/2 protocol. And just today, firtsly in my experience since HTTP/2 rising, i've heard as the ...
0
votes
0answers
83 views

Http Post - long delay at state ExecuteRequestHandler

I have an asp.net mvc website hosted on Windows Server 2012r2 Standard which uses KnockoutJS to display data in a grid. This server is dedicated to the process that I'm having trouble with - it does ...
0
votes
0answers
36 views

Poor network performance on host machine using libvirtd / Qemu / KVM

We've got two Fedora 27 servers that we use to host several virtual servers using libvirtd / Qemu / KVM that are experiencing the same issue. When freshly booted, network performance is great, pings ...
0
votes
0answers
15 views

Using hdparam for more strenuous tests

So I am tasked with getting some strenuous raw hard drive performance tests. We started with FIO but this has proven to be ineffective as the results are poor in windows and linux. I tried Bonnie++ ...
0
votes
2answers
63 views

How to measure profit of using huge pages

I'm looking for a way of measuring performance impact/gain, in case of using huge pages. For example, I have 192GB RAM server, with 140GB allocated by huge pages. I run Postgres, with shared buffers ...
2
votes
1answer
131 views

Mariadb 1000% CPU [closed]

I have a big problem with my site (Laravel based), I have from 1000 to 1500 contemporary visitors, and I have a problem with mariadb, practically when people use filters, and other options that ...
0
votes
1answer
53 views

bonded ethernet NFS use both NIC's possible?

I have a box with two 1Gb NIC's in it, bonded. The type of bonding is "per connection" so each connection goes "to 1 nic" but if a process has multiple connections, it will share the bonded NIC's and ...
1
vote
1answer
54 views

rsyslog writing to postgres. rsyslog process very high cpu, postgres very low cpu

I'm using rsyslog to write dns data to postgres. The messages are always quite short and similar to each other: <ip of host making dns request> <dns request> I use a regex to pull ip ...
1
vote
0answers
88 views

What is a “normal” latency/performance of inserts on mariadb or mysql?

Hadn't used MySQL family for years. Now need to move from OracleDB to either MariaDB or PostgreSQL. So on a similar "hardware" (Openstack VM: RHEL 7.3, 4HT cores of 2.5GHz Xeon E312xx, "local" SAN &...
1
vote
1answer
14 views

Why the 'uptime' command showing the load output faster than the 'w' command

Why the 'uptime' command showing the load output faster than the 'w' command. I am unable to use the 'w' command in high load environment but the 'uptime' shows the results more faster..
0
votes
0answers
66 views

File Server Resource Manager (FSRM) inconsistently triggering on a file screen rule

I've been exploring the capabilities of the FSRM -- specifically the File Screen Management feature -- to see how it works and what it can do. To test it out, I set up in a lab with some VMs. I ...
0
votes
0answers
31 views

High wa but no IO usage

My VPS is having extremely high wa (around 90), but there is no IO usage taking place. htop: iotop: nethogs: What can be the problem here?
0
votes
0answers
10 views

How do I help Cloudflare / Apache / Wordpress to cache 404 pages?

Using Newrelic I've found out that 65% of load on my web server was created from the 404 rendering of static resources, because the 404 page was rendered also for the missing static resources (jpg, ...
6
votes
1answer
168 views

HP dl360p G8 writes/latency with SSDs in raid very poor

I have a DL360P g8 server with a HPE p420i raid controller (2gb cache). We have noticed that writes to the SSDs via raid are incredibly slow. The drives in question I have in the arrays are: Volume 1 ...
3
votes
1answer
122 views

How to eliminate chunked response delay from NginX?

We have a cascade of two NginX reverse proxies in front of a Java web server. The first proxy runs on FreeBSD (11.1-RELEASE-p10) load balancers and proxies all internet traffic into the internal ...
0
votes
0answers
66 views

Performance issues with Kubernetes

I am having performance issues in kubernetes with my application. I have a nodejs application running inside a docker container in kubernetes, all it does it call a mongodb with a GET, there is quite ...
1
vote
3answers
63 views

Setting recursive permissions: how to increase performance?

We have a huge directory tree, many levels deep and with a (very) large number of small files at each level. From time to time we have large file data changes where parts of the tree are replaced and ...
0
votes
1answer
15 views

What are the split latency measurements produced by httping?

I've been using httping to monitor the performance of my load balancer. The httping utility accepts a -S argument which is briefly described in the man page: -S Split measured latency in time ...
0
votes
0answers
56 views

Docker - handle multiple Tomcat containers

I have the following setup in the company I am working: A Linux server running Tomcat with multiple contexts of the same java webapp. Although the webapp running on each context is pretty much the ...
0
votes
1answer
52 views

How to monitor/performance Jenkins server?

How to monitor Jenkins server and check the performance of the server. is there any tool to check regular or anything else.
6
votes
1answer
252 views

Nginx: Optimizing server response time for a HTTP cached website

I have a website with all of the pages served from nginx’s http cache and rarely invalidated or expired. The average total page download size is around 2 MB But despite being a static site with no ...
1
vote
1answer
287 views

NFS slow throughput

I have experienced some issues with less-than-expected throughput with NFS. After examining a number of options (endless googling), including raid setup, network interfaces etc, I wanted to test a ...
0
votes
0answers
31 views

How to force raid1 mirror to stripe on read

I use RAID1 - mirror long time. I have beleaved yet, that RAID1 does stripping on read operation for improve the speed. While migrating form 160GB disk to 3TB mirror, I started the file copy, ...
0
votes
0answers
7 views

How Can I Determining Time for Samba Network Request Versus How It Returns a File?

Implemented Samba as a method for file sharing to some Windows servers, but a question constantly gets asked about performance. How can I break down the time it takes for Samba to first receive the ...
1
vote
0answers
116 views

Linux Bonding with 2x10G LAN poor performance in kernels after 4.13.x

Here is our setup a DELL server with two 10G LAN ports and our old kernel 4.13.4 serving static video content using nginx (~8000 active connections) with the bandwidth of around 15.5G (1.2Mpps) on ...
0
votes
0answers
15 views

Do memories from different manufacturers impact performance? Is there a way to measure it?

Memory in one of my systems: % lshw -C memory|grep vendor | grep -v NO | grep -v 'American Megatrends' | grep -v 'Intel' vendor: Samsung vendor: Samsung vendor: Micron ...
9
votes
1answer
136 views

what is the IOPS behavior when partitions of single disk are used in an LVM?

I have an ubuntu 14.04.1 LTS server which have LVM(backed by hardware RAID5) with logical volume and a volume group named "dbstore-lv" and "dbstore-vg" which have sdb1 sdb2 sdb3 created from same sdb ...
0
votes
5answers
183 views

Configure JMeter to test a proxy service

I have developed a proxy service using ballerina language by referring the following [1] and [2]. It works perfectly fine. Now I want to run a load test via JMeter. That is JMeter should be configured ...
0
votes
1answer
141 views

Nginx performance drops significantly when I enable https (slower 30 times than http only) & 12 times slower than Apache https

I have an Angular website with static assets of around 1.5 mb and gzipped it is around 400 kb, I have nginx as my webserver & reverse proxy to the API server, when I test nginx with Apache ...