[Bug 268588] [NEW] Disk I/O is very slow, system freezes for seconds

[LGB [Gábor Lénárt]]

Public bug reported:

For a while (even with previous ubuntu versions as well), speed of disk
I/O is unacceptable. I thought it is a problem with my machine, but I
have a quite different machine with the same problem now, and also it
was quite OK a year (or years?) ago. Even installing a single deb
package with dpkg lasts for minutes, other processes trying to access of
disk are totally "dead", a single ls command in a terminal can wait for
a minute sometimes. Also, sometimes the mouse cursor can't be moved for
long seconds. There is nothing suspect in kernel log which can help.
During disk I/O top reports wait state for almost all CPU time. Can it
be caused by the pata->libata change for example, NCQ or something like
this? I have no idea how to improve the situation. I can provide
information of course if I know what I should send. Currently these are
machines running up-to-date Ubuntu hardy (32 bit). I can say system is
totally unusable even with smaller disk I/O load ...  Thanks in advance!

** Affects: linux-meta (Ubuntu)
     Importance: Undecided
         Status: New

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Disk I/O is very slow, system freezes for seconds
https://bugs.launchpad.net/bugs/268588
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