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I have Acer EEE PC with SSD drives and ubuntu 10.10. It works fine - most of the time - but after boot or io-intense operation (copying file, installing updates, etc...) load increases to 2, stays for a few minutes and slowly decreases back to 0.5 or so.

How I can confirm source of the problem? Is it SSD drives, software, drivers, something else? Any way to fix?

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Old question :-) – guntbert Nov 1 '13 at 21:10
up vote 1 down vote accepted

You could try the workarounds I already provided in this thread:

I noticed awful freezes during IO operations as well. While I can't tell why this is happening, I can offer a workaround. Here's how:

In a terminal, type

echo "deadline" | sudo tee /sys/block/sda/queue/scheduler

Try moving or copying larger ammounts of files again. You should notice a huge difference. If so, make the change permanent by typing in a terminal:

gksudo gedit /etc/default/grub

In the line beginning with GRUB_CMDLINE_LINUX_DEFAULT="", add the following string in between the ""s:


Save and exit. After that, type in a terminal

sudo update-grub


FYI: This changes the so-called scheduler to 'deadline'.



Another Possibility would be to lower dirty_ratio settings. To test it, type in a terminal:

sudo bash -c "echo 10 > /proc/sys/vm/dirty_ratio"

sudo bash -c "echo 5 > /proc/sys/vm/dirty_background_ratio"

If this helps, make it permanent by editing your sysctl.conf:

gksudo gedit /etc/sysctl.conf

At the end of the file, add the following lines:



Save, close and reboot. Done.

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Are you using Ubuntu One? I'm experiencing similar problems with U1 after boot.

You can try opening System Monitor (should be under System > Administration) at boot and see if ubuntuone-syncdaemon (or another program) is hogging the hard disk. Or better yet, download a program called iotop, and run it from Terminal right after boot. It'll show which program is responsible for the high I/O wait.

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