Questions tagged [performance]
Questions about server hardware and software performance, or network performance.
3,186
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MariaDB I/O Limit
I have a server with MariaDB 10.6.
The mysqld process uses 100% of DSK with very high I/O.
I tried to set these values but it didn't have any affect:
innodb_io_capacity = 100
innodb_io_capacity_max = ...
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2
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Windows server standard, processes not able to utilize all physical CPU
Please find the attached picture.
I have windows server 2019. with SQL server web edition and IIS.
the CPU always shows (on all 4 servers of same specification) that its utilizing only 48 cores (out ...
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How dangerous might it be - and what performance gains may be had - by turning vulnerability mitigations off on non-Internet facing servers?
When a virtual machine Linux host server is non-Internet facing and is used exclusively on a LAN and is using a relatively well tested distribution like Proxmox, how dangerous would it be to turn off ...
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Unbound as a caching intermediate server is slow, and doing more than what I need
What I need
A forwarding DNS server as an intermediry to another DNS server that serves expired records and renews its cache later.
Problem
I tried to use unbound as the only software that I've found ...
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774
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Slow read speed in ZFS mirror (slower than write speed, and very slow for small chunk sizes)
I have a server running debian on top of a ZFS 3-way mirror of Exos X18 18TB (ST18000NM001J).
I'm benchmarking it and I'm finding some surprises for the read rate under certain conditions.
But first, ...
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917
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Nginx cache for frequent and different requests
I have a service.
This service has a GET handle(/api/v1/retrieve_blocks).
This handle's requests and responces are small, no more than 1024 characters.
regular situation:
this handle is constantly ...
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2
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69
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Dell PE RHEL 7 terrible performance
We have an 'old' Dell PE r740xd server with quite high specs, installed with rhel 7 (latest).
Running ls -l on / can take minutes.
Some specs:
# lscpu
Architecture: x86_64
CPU op-mode(s): ...
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MDADM Nvme raid Slower than traditional HDD, need enlightenment
I have setup server about 20 days ago with new nvme, before setup raid mdadm the two Nvme samsung 980 pro 1TB i test bench have IO speed average 1.5G/s each nvme, but after creating raid 1, IO nvme ...
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199
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Laravel page loads over 1s in production (while blazing fast locally on my dev macbook)
I've shipped my Laravel based platform to a production server but with little to no users online page loads are still above 1 second, around 1,5s. There's little to no data in the database. I've ...
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File transfer between servers seems slow
I have two servers both running Rocky Linux v8.4, one hosts a raid drive that I use to back up a (very) large raid drive mounted on Server A as /home.
Server A (with the large raid of 70TB mounted as /...
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Fix the KubeletHasDiskPressure in Kubernetes on a very limited server
I have a question regarding our local Kubernetes installation (Kubelet version == 1.24.4).
We're having a Kubernetes installation installed using Kubespray.
I'm aware of a few related questions/...
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own openvpn server, connection falls down of 5% speed
I tried to set up my own openvpn server. Want to connect my devices like phone, tv, tablet, laptop and so on.
My system of the VPS:
CPU (4x):
Socket Designation: CPU 0
Type: Central Processor
...
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Poor forwarding performance between two WireGuard tunnels
I've got a dedicated server (Ubuntu Server 20.04), running two WireGuard interfaces:
wg0 is used to connect end-users, like laptops, mobile devices, etc.
wg1 is a tunnel to a 3rd-party VPN service
...
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Massive performance issue for just two users in UI and Download
I have a strange issue with my self hosted nextcloud instance:
All works fine, but I have two users who report huge issues with speed when accessing that nextcloud. Two independent effects apparently:
...
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WordPress with Nginx + PHP-FPM sometimes slow where slowlog pointing to wp-config.php (PHP 8.1)
I have a recent WordPress 6 installation with MariaDB and PHP 8 FPM running on Docker. Sometimes, request on the frontend have a slow response time on the main HTML document. In this example, one of ...
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kafka cluster RAID vs JBOD with new hardware and kafka versions
we want to design production kafka cluster with 7 kafka machines , on RHEL OS
kafka version should be - 2.7
usually we are installing the kafka machine/s disks as RAID 10 ( as confluent recommended )
...
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FIO test results wildly vary based on number of jobs
Take the following 3 commands:
fio --name=write_throughput --numjobs=8 \
--size=10G --time_based --runtime=60s --ramp_time=2s --ioengine=libaio \
--direct=1 --verify=0 --bs=1M --iodepth=64 --rw=write \...
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Are there any big performance boost when upgrade from Ubuntu 16.04 to 22.04?
If I run the server as MySQL database. (Assume using the same MySQL version).
Are there any big performance boost when upgrade from Ubuntu 16.04 to 22.04?
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RAID Controller -- SAS Expander -- SATA drives. What max throughput can be expected?
I am building fast recovery solution. And there is a stuck with the choosing of the RAID controller.
I have a chain:
24 SATA SSD drives each performing at 4Gbit/s. Total write throughput is 96Gbit/s.
...
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What are the consequences of RAM speed to high on a Proliant DL385 G7?
Rendering the 3D model of an optical lens or mirror with openSCAD can require huge amount of RAM, and for this use, I have maxed the RAM on a Proliant DL385 G7 but the RAMs I got were PC-14900: ...
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40Gbit/s RAID10 - on a single raid adapter is it possible?
I need an ultrafast backups restore for my solution.
I am going to use two hosts: operating server and backup server.
Both servers will be connected directly via 40Gbe PCIe 4.0 8x ethernet adapters so ...
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3
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1k
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Performance improvement for Innodb - High CPU
I have a dotnet application that has a high-traffic connection to the MySQL database. It's an application that stores IoT data. It connects to the database approximately 50 times per second. In these ...
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Firewall throughput and LAN Speed
A quick question, I'm considering to buy a firewall which offers throughput up to 450 Mbps and has fast Ethernet ports, my understanding is that the firewall limits the internet speed but not LAN ...
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487
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Disk speed on Azure Virtual Machine Scale Set is slower than advertised
I have an Azure Service Fabric cluster with 5 nodes, baked by an Azure Virtual Machine Scale Set. The size of the instances is Standard_D2ds_v4 with an advertised disk speed of max 3200 IOPS. At the ...
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sdb: Disk read/write request responses are too high (read > 20 ms for 15m or write > 20 ms for 15m)
I use Zabbix agent to monitor my Linux servers.
I start to receive this alarm:
sdb: Disk read/write request responses are too high (read > 20 ms for 15m or write > 20 ms for 15m)
incident ...
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How to optimise javascript delivery on wordpress / apache / AWS?
I'm down the rabbit-hole of website speed optimization. I have a site that's getting terrible marks from all of the usual suspects (PageSpeed and GT Metrics, specifically; it looks OK on Pingdom tools)...
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Object Storage vs HDD Block Storage
Currently I am using SSD Block Storage at Digital Ocean which is very costly. When I checked Vultr they are providing HDD Block Storage. Which is cheap.
We have to store approx 700GB of data (Mostly ...
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KVM: Best performance for all guests
With KVM, what is the best way to provide the highest possible performance to all VMs?
The host has a hexa-core processor and 64GB of ram. 3-4 VMs should run on it.
The VMs are idle a lot of the time, ...
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Simple haproxy TCP passthrough results in very slow network transfer speed
I've setup a simple haproxy instance on a clean install of Debian 10 Buster. I've added some simple necessary config to enable the passthrough to the IP address in question (which has been redacted in ...
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VMWare Disk Performance
I have an HP ProLiant DL380p Gen8 (VMWare 7u3 installed) with 2 pieces of 960GB SSD RAID1 arrays (total of ~1+1=2GB usage). The rest of the configuration is like
24 CPUs x Intel(R) Xeon(R) CPU E5-...
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centos7.9 mdadm raid0's performance which is only 50% of centos8 mdadm raid0
I use the same PC and same NVMe SSDs do the raid performance test on different OS. The steps are as follows:
mdadm -C -v /dev/md0 -l0 -n4 /dev/nvme[0123]n1
mkfs.xfs /dev/md0
mount -o discard /dev/md0 ...
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Tuning ZFS for bursty sequential writes
This is a follow-up to: High speed network writes with large capacity storage. The setup has changed notably.
I have a pool with a single raid-z2 with 6 drives, all Exos X18 CMR drives. Using fio and ...
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enough memory for downscale ubuntu server?
Management decided to downscale prod server.
Current size: Standard B16ms (16 vcpus, 64 GiB memory)
Desired size: Standard B8ms (8 vcpus, 32 GiB memory)
CPU is mostly idle (output is from sar -u)...
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1k
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Why is my Laravel App having 3+ seconds TTFB in Production?
I've looked around but can't find a definitive answer on if things like Images affect TTFB which would be my best guess as to why my site is taking so long to load in production. After the page is ...
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What do results of Linux time wrapper tell me happened to this cp command?
My view on this issue is from the developer side. I write the code that gets placed on a RHEL virtual machine running as one of many in an enterprise system. The filesystem being used is a remote, ...
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Many resource-hogging iexplorer.exe processes on all workstations
Suddenly all our workstations are having an issue with sluggish performance. Inspecting task manager, there is a common culprit: several iexplorer.exe processes exist (~7 on average, but varies with ...
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NVMe SSD poor writing performance on Debian 10
I just went for some disk performance tests on my DIY NAS and noticed some very poor performace results with my NVME disk writes !
My NAS runs Debian 10 with this config :
ASROCK X470D4U with Ryzen 5 ...
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Is it necessary to ban malicious IP regardless of default firewall setting being deny/reject?
I'm on Linux and using fail2ban as the ban system. So far, it has collected and banned about 150K of malicious IPs, and I'm concerned and wondering if this will gobble a fair amount of resources. As I ...
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What's the difference between a "degraded" RAID 6 array and a "clean" RAID 5 array?
Suppose you have two RAID arrays, one with N disks and one with N+1 disks. The array with N disks was formatted as a RAID 5 and left alone, while the other array was formatted as a RAID 6 before one ...
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High util iostat
I have server with oracle db. It works on Dell Unity storage.
The server has very slow disk IO.
How can I fix it?
Here are some details of my server:
OS - OL8
Kernel - 5.4.17 uek
Storage - Dell ...
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519
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How to constraint already running interactive processes with cgroup2
My home-server is running some aged hardware (Core i5-3450, software RAID1 on SATA disks) and often has problems when I run performance-intensive things like a compile-job besides "normal" ...
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VPS performance apparently low - how can I verify?
I apologize wholeheartedly but this is probably as unspecified as it can get as for a question.
I run a linux VPS and...I think it has an important performance problem, but I can't pin point what it ...
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870
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Disk iops vs latency
I am trying to understand the diference between iops and latency, this is my question:
If an hypothetical disk had 2 io per second, then its latency would be 0.5 seconds?
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Virtual machine vs real machine server performance [closed]
I want to self-host some services (some examples include, but are not limited to, Nextcloud, Matrix, Jitsi, Bitwarden).
For security reasons, I don't want to install all of them on the same machine ...
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Disk read metrics not showing for postgres activity
I've long noticed that ESXI wasn't showing disk READ activity for my Ubuntu Postgres database server. I figured maybe it was just a weird bug with ESXI, as it would show disk WRITE activity.
I decided ...
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What Ethernet twisted pair cable is best with a particular Ethernet switch
tl;dr I want the appropriate Ethernet cable for my Ethernet switch. How do I correlate Ethernet cabling speeds measured in hertz with an Ethernet switch "speed" measured in bits-per-second ...
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The HTTP version of my websites take a long time to resolve, while HTTPS versions instantly resolve. How to debug it?
I create many websites for my customers.
And I register domains via different registrars.
And I have a couple of VPS servers, distributed in different data centers.
However, I see this weird behavior.
...
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High Load Average in Solaris Operating System - Due to high read I/O
In Linux OS, the load average is dependent on multiple factors like CPU utilization, number of uninterruptible sleep processes, and others. On the other hand, Solaris OS load average is dependent on ...
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What could be causing twitterbot to take 6s to download small image assets?
Many (most) times twitter makes http requests for certain images, the response time (as recorded by nginx in the logs) takes 6s. Yet other sites (e.g. facebook) and sometimes twitter, typically get ...
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3
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best filesystem for millions of files [closed]
Which Linux filesystem/setup would you choose for the best speed in the following scenario:
a few million files
~3mb file size on average
random access to files
need to get a list of all the files ...
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