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Questions tagged [performance]

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

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21 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 ...
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0answers
13 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 ...
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43 views

SQL Server 2017, 2012 Express Edition Insert Select Performance Issue with very less data

Command 1: (Get Count from View1) Select Count(*) From View1 Results: ----------- 183 (1 row affected) Execution time = 11 seconds Command 2: (store the count in a table called Temp) Drop Table ...
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1answer
100 views
+50

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 ...
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5answers
86 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
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1answer
40 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 ...
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1answer
17 views

Performance testing an Azure Netapp instance

We are looking to run a Netapp instance in Azure Ireland. The first time our cloud architect tried it performance was terrible. We therefore want to run some performance tests but are hitting a brick ...
2
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1answer
48 views

Intel NVME performance on Linux

I have an Intel 760P NVME drive hooked up to a Supermicro X11SRM-F with a Xeon W-2155 and 64GB of ddr4-2400 RAM. The specs for this drive claim 205K-265K IOPS (whatever 8GB span means) with about 3G/...
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2answers
41 views

PCIe 3.0 downgraded to 2.0 speed

I have a dual Xeon board with Intel C602 chipset and two E5-2670 CPUs. The board comes with five PCIe 3.0 x16 slots and a PCIe 3.0 x4 slot; all of which are directly connected to the CPUs. I added a ...
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2answers
1k views

How to backtrace slowness of a shared hosting web server

I have a shared hosting plan (godaddy), and time to time I suffer slowness problem. When this happens, I try to login to cpanel to double check if the problem is me or the server, and it also takes 1-...
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1answer
27 views

JMETER: Which requests to load

The question is about load testing a web application, in order to find out server capacity (I should answer the question: For how many users using my web application, the server can handle the ...
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0answers
33 views

Tcp/IP Latency on Ethernet peer to peer connection

I'm having 2 computers connected over the ethernet and communication with each other in a test setup. No for a round trip for a message to travel from computer A to B and back it takes about 12 ms for ...
0
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1answer
24 views

Why does WordPress on 3 load balanced EC2 servers run out of memory/fpm child processes and crash?

The problem: 30-40 minutes after pointing the DNS from our old server towards our new server, all available memory gets used up and our (3) load balanced EC2 instances crash. To make matters worse, ...
0
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1answer
36 views

What does iostat show a different utilization for the 'dm' device?

I installed an M.2 drive into a Proxmox host this morning and monitored the disks with iostat -x 1. Why is iostat showing dm-7 is at 98% utilization, while the M.2 LVM PV (nvme0n1p1) shows only 6.8? ...
3
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0answers
115 views

GeoIP vs IPset performance in iptables

I would like to ask you what is faster in term of performance GeoIP or IPset. Let me explain, imagine that I have rule: iptables -A INPUT -m geoip ! --src-cc US,UK,CA -j DROP And imagine that I ...
0
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2answers
70 views

AWS RDS with Postgres : Is OOM killer configured

We are running load test against an application that hits a Postgres database. During the test, we suddenly get an increase in error rate. After analysing the platform and application behaviour, we ...
3
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4answers
74 views

DL580 G7 giving only low performance on CPU (E7 4870)

I have a DL580 G7 with four E7 4870 and 128gb of RAM installed (eight cartridges with 2x 8gb each). The operation system is Ubuntu 18.04. There is a TITAN X on the pcie16 and the obligatory p410i ...
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0answers
22 views

MySQL Server cause high wait %

I've a website made of a frontend AWS instance (nginx + php-fpm) and a backend AWS instance (mysql+solr). Both instances has EBS as volume, with high IOPS capacity. The website worked well for ...
0
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0answers
22 views

Intermittent delay sending MSMQ message across network

I'm experiencing an intermittent problem when sending an MSMQ message from one server to another, where the message is sent from one service, but is not received by the consumer for up to 30 minutes. ...
0
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1answer
38 views

VPS high traffic load

Hello everyone I am really new on this topic so most of my questions will be trivial. I buyed a VPS from godaddy which has 4 CPUs 8GB Ram and 200 GB HDD. I set up a one domain and upload my web site ...
2
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1answer
108 views

Does TRUNCATE take a long time on huge tables 10gig+

I wonder if it is a good idea to use phpMyAdmin's empty feature on a table with ~12gb on a production server. I don't want to cause too much lag but need to free some disk space. This needs to be ...
0
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1answer
143 views

KVM-QEMU Windows Guest Memory Speed

How to speed up memory in Windows guest running on KVM-QEMU hypervisor? The memory speed differs between Ubuntu guest and Windows 2016 Server on the same node quite a lot. Same benchmark tool counts ...
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0answers
11 views

How can I further improve Oracle 12.1 performance on RDS m4.large instance?

I'm having performance issues with my current Oracle setup. Queries are taking half a second and I can't figure out how to speed it up further. I've upgraded my RDS instance from a t2.medium to m4....
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0answers
33 views

what causing LTO 6 to write only 1.5TB? [duplicate]

enter image description hereI have been using the IBM TS2260 3580S6E Drive from 2014. From two weeks I am getting an issue with the space in the tape media. After the format while I am copying data to ...
5
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1answer
156 views

Why do my SSD read latency benchmarks get markedly worse when I put an XFS filesystem on top?

I am benchmarking a small server box based on the SuperMicro E300-8D. I've installed the latest CentOS 7.5 with the latest updates, 64GB of DDR4-2100 RAM, and a Samsung 970 EVO 1TB NVMe SSD. The OS ...
3
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1answer
137 views

What does new “S3 Increased Request Rate Performance” annoucement mean

On 17 July 2018 there was an official AWS announcement explaining that there is no longer any need to randomize the first characters of every S3 object key to achieve maximum performance: https://aws....
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0answers
26 views

Collectd on Solaris NFS server

I have collectd running on an NFS ZFS Solaris based server gathering NFS performance data points. Where does collectd store this information by default.
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0answers
23 views

Performance on Pinned CPU cores versus automatically managed?

I have a XenServer 7.5 environment where I'm running a single Windows VM with 16 total vCPU's. My server has dual Xeon E5-2620v4 CPU's with 8cores/16threads each clocked at 2.1GHz nominal and a Max ...
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0answers
55 views

Bad performance on better hardware

I have postgresql streaming replication on 2 hosts and I've faced with the problem of different performance compared between two servers. It looks like all sql queries on one host are slower on 70-90% ...
3
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1answer
107 views

How to get load average in Windows

In linux by "uptime" command you can get the load average in last 15 minutes. But how to get that in windows? Many had suggested alternative found here. But it is about CPU utilization where load ...
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0answers
71 views

SSD performance on Ubuntu + Nginx

I'm trying to improve the performance of server for nginx 100TB/month images distributions. But I have two problems: high CPU load and periodical splashes (I don't know why) Hardware is quite poor (...
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0answers
77 views

Is it worth using Nginx as an SSL/TLS terminator in front of Varnish, rather than just Nginx itself as a cache?

First off, as I understand it, Varnish Cache is only a HTTP accelerator, and thus does not support client-side or server-side (backend) connections over HTTPS, despite the existence of this whitepaper....
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1answer
158 views

Very high tcp retransmit rate to Internet on devices inside LAN

I work with Linux systems a lot as a developer and have a moderate level of networking knowledge, but the following situation is a real baffling mystery: I'm running pfSense 2.4.3 (that's current) on ...
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1answer
37 views

Cheapest solution to monitor gigabit internet connection performance [closed]

I want to perform speedtest-cli performance tests of the internet connection of a fibre connection which is advertised to 1Gbps at regular intervals, say every hour, for one year. I have been looking ...
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2answers
264 views

what is the relation between block size and IO?

I have been reading about disk recently which led me to 3 different doubts. And I am not able to link them together. Three different terms I am confused with are block size, IO and Performance. I ...
2
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1answer
32 views

UDP. Sending speed is limited by the minimal Ethernet adapter configuration

I have 1Gbit Ethernet adapter on my computer. And I have the other computer with Ethernet adapter 100Mbit. The both in one LAN and connected through the 1Gbit switch. 1 Test: I try to send from my ...
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4answers
99 views

Why does disk latency drop during periods of heavy writes?

Looking at the output of Munin's diskstats plugin (which is reading from /proc/diskstats) I'm noticing what seems peculiar to me. The disk is a SSD, and I would assume, magnetic or solid state, that ...
0
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1answer
62 views

Need help increasing performance of logstash

We are in the process of deploying an ELK stack and need advice and general recommendations regarding the performance of the cluster and more specifically, logstash. So the current setup we have now ...
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0answers
30 views

capturing durations (intervals) between tracepoints in perf

When using the perf tool (Linux), is there any simple and convenient way to time durations between two tracepoints? The obvious use is for syscall sys_enter and sys_exit points like sys_enter_fsync ...
0
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1answer
51 views

MySQL perf bad on SSD-based server. Small tables. MySQL config? RAID?

I have a couple of servers in an industrial setting (air-gapped network) that do some fairly light telemetry gathering. We generate about 10GB of telemetry history in ~30 days. All telemetry goes ...
4
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1answer
229 views

SSD IOPS on linux, DIRECT much faster than buffered, fio

I have a 30Tb-sized hardware RAID-6 system (LSI 9280-8e) of 10 DC-S4500 Intel SSDs that is used for database purposes. The OS Debian 7.11 with 3.2 kernel. The filesystem is XFS mounted with nobarrier ...
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1answer
2k views

cost of syscall very different on similar machines

I have two machines: 1) 2 x E5-2620 v3 @ 2.40GHz (microcode: 0x3c 2018-01-19), 8GB RAM (CentOS 7 w/ 4.11 kernel) 2) 2 x E5-2630 v3 @ 2.40GHz (microcode: 0x3c 2018-01-19), 64GB RAM (Fedora 22 w/ 4.11 ...
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0answers
204 views

IIS: Slow time-taken does not match with application api response time

We are in a situation of API Micro services architecture. There is an API endpoint (initialise), which is called by the Native. This "initialise" endpoint is further calling four endpoints. Since ...
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0answers
117 views

Ffmpeg performance after running many instances on same time

I use hangfire to run a tool to generate Videos using FFmpeg tool, what I discovered that after a high number of parallel FFmpeg execution, FFmpeg gets so slow in response I thought it was hung but it ...
0
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1answer
106 views

Can I compare stress-ng bogo ops/s across different CPUs?

I'm testing out a new server with a Xeon 6130 CPU and trying to compare it to an older box with the E5-2660v4. Here's a test I just ran on each box: On the 6130: # stress-ng --matrix 40 -t 30s --...
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0answers
21 views

Give read operations priority over write

I'm working on a system where I have a program that outputs high quality videos for a tv connected to an HDMI (raw 1080p data for instance) and I'm having an issue that when I copy some files to my ...
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0answers
146 views

Ubuntu Server Performance Issues with CockroachDB

I have a cockroachdb node I am playing with. My box has Ubuntu 16.4, 64 GB of RAM, 4 physical cores (Quad Core Intel Xeon 3.3 GHZ). Inserts to this DB are very slow. On a 100000 sample set, average ...
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0answers
9 views

Real World Speed Test via public Web Pages

Warning: I know up front that this is a question asking both for resources and opinions. Ideally, feedback/answers could address the spirit of the question, rather than shout it down. By spirit of the ...
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0answers
116 views

Strange await times in iostat output

I am seeing strange big numbers as w_await times (like 5 million ms) on a server with 2x SSD in MD RAID1. Scheduler is deadline. OS is Debian 9 with kernel 4.9.65-3+deb9u1. Is this just some sort of ...
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0answers
34 views

Compare performance with and without TPM module

I try to compare PC performance with TPM and without TPM module. My 1-st idea is to measure PC boot time for encrypted HDD with active TPM and with TPM disabled. What else cases suitable to do ...