VirtualBox

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Ticket Resolution Summary Owner Reporter
#9933 obsolete Seamless mode aritifact-ing Kyle
Description

I have a win 7 64 bit host with a ubuntu 11.10 32 bit guest that I have installed the guest additions for using the mount and install method documented on the vbox site. When initiated into seamless (using host + L or menu) there is extreme artifact-ing that results in an image being left in very quick intervals on the host screen. This does not occur in full screen or scale mode.

I uploaded a screen shot as well as the VBox.log here: http://assets.slajax.com/filestore/bugs/vbox-seamless-artifacts.jpg http://assets.slajax.com/filestore/bugs/vbox-seamless-artifacts.txt

Please let me know if there are more tests or information I can provide.

#8538 duplicate Hostgis Linux - Guru Meditation Alejandro
Description

Host OS = Slackware 13.1 Guest OS = Hostgis Linux 4.3-32bit-BasicServer Virtualbox version = 4.0.4 r70112

Important note: error when booting from the iso file, it worked with an old version of virtualbox 3.x.x that I used like 3 weeks ago

I ran memtest in my host OS and all tests passed

#11936 obsolete Large USB transfers never finish sl4mmy
Description

TL;DR - I believe there is a bug in VirtualBox's USB system that causes large transfers to timeout in multiproc guests running on hosts with multiple NUMA nodes.

I sync my iPhone with iTunes running in a Windows XP guest. That guest is configured with two CPUs.

A long time ago (circa VirtualBox 4.0) everything worked fine, but somewhere along the way something changed such that I could no longer backup or sync my iPhone. The backup or sync would start and run for a while, but eventually the process would stop making progress (the iTunes progress bar never moved). I observed that when the backup or sync first started the red "activity dot" on the USB cable icon in the VirtualBox toolbar was constantly on, and at the point when progress stopped the red dot also stopped and would only flash periodically.

I was able to work-around this problem by changing my guest to only have one CPU. With that change every backup and sync completed successfully.

During the course of troubleshooting #11610 I noticed that if I used numactl on my host to bind VirtualBox to a single NUMA node (e.g. numactl --cpunodebind=0 --localalloc -- /opt/VirtualBox/VirtualBox) then my iPhone backups and syncs worked just fine even when the guest was configured with two CPUs. However, when testing VirtualBox 4.2.16 without the numactl hack to confirm that #11610 was indeed fixed I noticed that my iPhone backups started hanging again when the guest is configured with more than one CPU.

Once again I'm working around the problem by configuring my guest with only one CPU, but based on Frank's comments in the discussion of #11610 (https://www.virtualbox.org/ticket/11610#comment:54 and https://www.virtualbox.org/ticket/11610#comment:55) I wanted to document this issue for the VirtualBox team's future NUMA refactoring. :)

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