Questions tagged [performance]
Questions about server hardware and software performance, or network performance.
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iperf3 test shows 40Gbps for a 100Gbps supported NIC
I was performing iperf3 tests between 2 servers which supports 100Gbps NIC.
OS is rocky linux 8.8 Both ports are LACP bonding enabled with layer 3+4 mode. Hardware is HPE alletra 4110.
Test1: Both ...
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HPE Smart Array P408i 2GB experiencing a performance drop
I have two HP ProLiant ML 350 GEN 10 with a RAID 10 SSD Samsung disks and HPE SmartArray P408 with 2 GB cache. It has good performance:
When copying large files, performance drops after two minutes......
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Linux LUKS Encryption - On-demand or FULL in advance?
When encrypting a device using LUKS, it seems to be encrypted "on-demand", I mean, apart from the encryption header data is encrypted "on-the-go" as it is written to the device and ...
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Criteria for throttling of Azure disk storage
I need the criteria that will result in throttling of disk storage in Azure.
Will high disk IOPS (how high I can see percentage in the metrics) result in throttling?
What are the factors that causes ...
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How to diagnose slow connection to server that has high upload speed?
I have an Ubuntu server that upon running the speedtest cli showed ~150mbps upload speeds, however when I connect to a librespeed instance running on the server I get only ~4mbps download speeds from ...
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More cores = faster response time?
I have a multithreaded application that listens to events and needs to respond to them instantly.
With the application running, my server is under 5% CPU load in a 1 core server.
I wonder though, ...
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ZFS folder very slow after having many files
I am running Ubuntu 24.04 using ZFS for my filesystems. This is on a laptop whose only storage device is a WD Black SN850X NVMe card. The default Ubuntu installation process configured two ZFS pools:
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Exchange 2019 On-Premise OWA/ECP/Autodiscover Issues
I have lurked here and over at StackExchange (Imagine my surprise to find out they are the same group, just different), and have used questions and answers for years until now when I've hit a ...
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Intel turbo boost all core clock speed in practice
My understanding is that Intel's quoted "max turbo boost" speed is only guaranteed when a single core is active, and that when all cores are active, the clock speed could conceivably fall to ...
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How to debug OpenLDAP
We are running an openLDAP server on version 2.5.13 on a Debian Bookworm virtual machine. Since upgrading at the start of the year from version 2.4 (and Debian Bullseye) to 2.5 (and Debian Bookworm) ...
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Intermittent High CPU Spikes and Network Latency on Proxmox VMs Running Kubernetes
Summary:
I recently migrated a Kubernetes cluster from bare metal to a Proxmox VM on the same physical host. Since the migration, the VM experiences intermittent high CPU spikes and network latency, ...
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Pretesting traffic on a website
I had a php application last year that was working on shared hosting that has 1 GB RAM and 1 CPU core. At the time, there were 200 users using the service and the performance was perfectly fine. ...
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High IO utilization without high read/write
Our server occasionally becomes laggy when writing files. using iostat I noticed that the disk utilization is abnormally high. However, the read/write per second does not seem too high
# example ...
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Images from file system are loaded very slowly when on VPS, faster on localhost
My / endpoint returns eleven DTOs, each DTO having a String field imagePath, which looks something like this http://localhost:8082/api/get_image/imagename.png (when on VPS, the imagePath looks like ...
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Why Swap usage is high for Influxdb: 100% Disk I/O and Swap usage but only 50% memory?
We have an influxdb VM that is constantly under 100% swap. Even if we restart the VM, the swap usage reaches 100% in about 20 minutes. However, memory usage is only about 50%.
(The VM has 32 CPU Cores ...
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