I've investigated a lot and found out that it is an ACPI issue, IMHO.
After more installing and purging packages I found out that two packages
"breaks" the system: acpi-support and upower.
If I uninstall them then I have no IO issues.
The new workaround without uninstalling packages:
- disable /etc/init.d/acpi-support script: just remove executable flag,
sudo chmod a-x /etc/init.d/acpi-support script
- disable UPower daemon:
cd /usr/share/dbus-1/system-services
sudo mv org.freedesktop.UPower.no_service org.freedesktop.UPower.no_service
- then reboot (because if you have the IO issue already then reboot helps only)
After that you don't use suspend to RAM or you have the IO issue after
wakeup.
Just now I have 135 Mb/s for SATA SSD and 120 Mb/s for SATA HDD, in
13.04, i386. It is not perfect (under some amd64 Ubuntu I have 370 Mb/s
for the same SSD while his max speed is 340 Mb/s) but much better.
Any ideas? I'm ready to test and hack linux. :)
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https://bugs.launchpad.net/bugs/1264707
Title:
IO limit 1.2 MB/s for 32bit ubuntu (ACPI issues)
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