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Questions tagged [iowait]

iowait is the percentage of time that the CPU was idle during which the system had an outstanding disk I/O request.

13 questions
15
votes
1 answer

Decrease of transfer rate when copying large amount of data

I am using a Ubuntu 16.04.3 LTS system (4.10.0-40-generic) with two HDD's and several partitions on each disk. When I copy data (<5GB) between the two disk I get a transfer rate around 70 MB/s. However, when I try to copy a large amount of data…
user3074126
  • 151
3
votes
1 answer

Machine stops suddenly, Only hard reset can help

It is happens sometimes, im just working and suddenly machine starts lagging. Then it can totaly stops (Nothing works, mouse, keyboard etc.), or sometimes not. Jun 5 16:04:12 c0rp kernel: [ 2636.897221] CPU1: Package power limit normal Jun 5…
c0rp
  • 10,010
3
votes
2 answers

CPU IOWAIT CRITICAL

I have an error that annoys me enormously because it makes me crash my website at times because the IOWAIT is too high. Here is the mistake I have: CRITICAL on CPU_IOWAIT (Min:11.3 Mean:14.1 Max:15.7): bioset, bioset, acpi_thermal_pm when the…
Chris99391
  • 139
2
votes
1 answer

very high IOWait + extremely slow hdparm -tT

I have been running 12.04 on my Fujitsu Siemens Lifebook E751 for almost a year without any problems, and then several days ago I noticed a very high CPU IOwait that makes the system poorly responsive (it freezes for fractions of a second, but this…
Filip Maric
  • 126
1
vote
2 answers

Ubuntu 16.04 LTS - multiple or big data cp increases io wait until system blocks

Initially I recognized the issue when I wanted to tar my hard drive and then copy a 100 GB file. Meanwhile I tried lots of things and basically I am seeing that lots of data copying causes a system fail. The following script with some files in…
Joe
  • 11
1
vote
0 answers

Very high IOWAIT times

I have a large system - 128GB, a couple of RAID0 filesystems (6TB and 2TB) with an SSD cache, 8 cores (16 with hyperthreading), running Ubuntu 12.04 64bit. When I try to write a large file I get very poor performance, and iotop shows processes…
user3324033
  • 151
1
vote
0 answers

chromium is causing a lot of IOWAIT, what to do?

ubuntu 20.04 This high iowait is very problematic... if I need to install, lets say kate and it will download 73MB and extract it, with chromium running it would take about 1h, when I close it it takes about 5min. I updated all extensions now (I…
Aquarius Power
  • 4,149
1
vote
0 answers

High IO> on EVERYTHING when trying to load games

So I'm new to Ubuntu and whenever I try to load a game (so far it's happened with any Linux game that I've tried) it goes fine for a bit, then the computer starts freezing up and I can't do anything. Watching iotop while this happens the IO> on…
StarbladeIce
  • 11
0
votes
1 answer

Ubuntu 14.04.1 hangs every minute

Every minute I get a second or so of minor lag. So far I know the following: It happens every minute around :00 seconds It only affects video, not audio I get a spike of iowait and disk write every time it happens Using iotop, the culprit appears…
TheSchwa
  • 3,860
0
votes
0 answers

Gluster i/o wait system freeze

I'm running Ubuntu 22.04.2 LTS on a supermicro system with the following configuration: Intel Xeon Gold 6248R 256GB RAM Samsung PM1735 NVMe SSD (6,4TB) // (currentfirmware: EPK98B5Q) XFS filesystem TRIM causes a consistent freeze of the whole…
eftotheoh
  • 1
0
votes
0 answers

Ubuntu on Dell Lattitude E5550 slows down

I have installed Ubuntu 18.04.3 LTS on my laptop. The specs are: Corei7 16 GB RAM Seagate Firecuda 1 TB HDD ST1000LX015-1U71 The main partition is EXT4, and my home partition is ZFS The system gets very slow at times (not always). The HDD light is…
A.R. Nasir Qureshi
  • 1
0
votes
1 answer

System freeze. RAM and SWAP full? iowait goes high and processes all seem to want to read and write data at high speeds to hdd

EDIT: I messed up the install below due to n00b and trying bleachbit and updating, probably not rebooting in between had that effect. Could fix most of it but didn't feel right. SO I moved to a clean install of 19.10. System has 6GB of ram, install…
Excalibur
  • 23
0
votes
1 answer

iowait CPU usage excessively high

So I've been trying to diagnose an issue with my Ubuntu Server VM running super slow. I run Ubuntu Server 18.04LTS with docker installed. I've been using netdata to try and monitor system stats and it's showing my value for iowait as about 60%…
Spencer Skinner
  • 31