Ticket #10451 (closed defect: worksforme)
Machine becomes very slow after virtualbox upgrade
| Reported by: | Merrilin | Owned by: | |
|---|---|---|---|
| Priority: | major | Component: | other |
| Version: | VirtualBox 4.1.8 | Keywords: | very slow VM |
| Cc: | Guest type: | other | |
| Host type: | other |
Description
I recently upgraded a virtualbox that was running a version 3.x (sorry, I did not keep the old version number). The Gentoo 32 bit guest OS was running fine until now, but became unusably slow after the upgrade.
I noticed that deactivating the settings "VT-x/AMD-V" makes the machine halfway usable (with a 3x to 4x slowdown compared to before). With that option on (with or without "nested paging"), the slowdown is definetely higher than 10 and does not allow to do much with the VM.
I have tried numerous versions of Virtualbox 4, and am currently with 4.1.8. None of those I tried did behave better.
I also tried to destroy the VM and recreate it with the same .vdi file, with no success.
Attachments
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VBox.log
(99.7 KB) -
added by Merrilin 23 months ago.
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VBox-VT-X-on.log
(76.8 KB) -
added by Merrilin 23 months ago.
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VBox-test-1.log
(76.8 KB) -
added by Merrilin 23 months ago.
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VBox-test-2.log
(77.0 KB) -
added by Merrilin 23 months ago.
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VBox-test-3.log
(77.6 KB) -
added by Merrilin 23 months ago.
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VBox-test-4.log
(78.1 KB) -
added by Merrilin 23 months ago.
Change History
comment:3 Changed 23 months ago by Merrilin
Here is a new log, obtained with the same VM with VT-x On (so that it was indeed unusably slow (I did not even try to start up an X session in the linux guest).
comment:4 Changed 23 months ago by frank
Thanks for the new logfile. You assigned 2GB guest RAM to the guest. Could you do some more tests?
- Can you reproduce the same slowdown with 1GB guest memory?
- Does it make a difference if you enabled PAE for that VM?
- Does it make a difference if you disable nested paging for that VM (keeping VT-x enabled)?
comment:5 Changed 23 months ago by Merrilin
Thanks for the update. I have just ran four tests:
-1- 1GB guest memory, PAE disabled, Nested Paging enabled -2- 2GB guest memory, PAE enabled, Nested Paging enabled -3- 2GB guest memory, PAE disabled, Nested Paging disabled -4- 1GB guest memory, PAE enabled, Nested Paging disabled (the combination of all three suggestions basically).
All are in the "unusably slow" category (20x slow down roughly). I am not sure whether the logs are useful, but I attach them just in case.
comment:6 Changed 23 months ago by Merrilin
I eventually decided to scrap the VM, VirtualBox version and everything, so I will unfortunately not be able to contribute any further element. The new VM (copied from the other computer actually so that I did not have to reinstall the guest at all) litteraly flies.
