Disk I/O is very slow, system freezes for seconds
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Expired
|
Medium
|
Unassigned |
Bug Description
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!
Thank you for taking the time to report this bug and helping to make Ubuntu better. Unfortunately we can't fix it without more information.
Please include the following additional information, if you have not already done so (pay attention to lspci's additional options), as required by the Ubuntu Kernel Team:
1. Please include the output of the command "uname -a" in your next response. It should be one, long line of text which includes the exact kernel version you're running, as well as the CPU architecture.
2. Please run the command "dmesg > dmesg.log" after a fresh boot and attach the resulting file "dmesg.log" to this bug report.
3. Please run the command "sudo lspci -vvnn > lspci-vvnn.log" and attach the resulting file "lspci-vvnn.log" to this bug report.
For your reference, the full description of procedures for kernel-related bug reports is available at https:/ /wiki.ubuntu. com/KernelTeamB ugPolicies
The current Alpha5 for Intrepid Ibex 8.10 contains the newer 2.6.27 Ubuntu kernel. You should be able to test via a LiveCD. Please let us know immediately if this newer 2.6.27 kernel resolves the bug reported here or if the issue remains.
Thanks in advance!