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Ticket Resolution Summary Owner Reporter
#15421 fixed Default RAM for Fedora (64-bit) is not enough jackqq
Description

The default RAM setting for Fedora (64-bit) is 768 MiB. The installation LiveCD for Fedora 22 is nearly non-responsive with full CPU usage (process name kworker) and continuous CD-ROM reading activity.

The original iso file name is: Fedora-Live-Workstation-x86_64-22-3.iso.

When I increase the RAM to 1024 MiB, the performance is acceptable.

#15420 worksforme Running a VM on Linux forces the kernel to call exit_dns_resolver a lot rtvd
Description

I have a Linux system with VirtualBox 5.0.20 r106931.

Starting any VM (either Linux or Illumos) shows that a lot of time is spent in a strange part of Linux kernel, the "exit_dns_resolver" function. It is so severe that approximately 80-90% is spent just in that function.

As soon as I stop the VMs the situation returns back to norm.

perf record shows the following traces:

    32.70%    32.70%  EMT-0           [kernel.kallsyms]            [k] exit_dns_resolver                                                                                                                  
                     |
                     ---exit_dns_resolver
                        |          
                        |--99.71%-- __GI___ioctl
                        |          |          
                        |          |--99.65%-- 0x104492
                        |          |          0x92eb4
                        |          |          0x8fdbf
                        |          |          0xfe7ec
                        |          |          0xfff1c
                        |          |          0x17b35c
                        |          |          start_thread
                        |           --0.35%-- [...]
                         --0.29%-- [...]

    27.18%    27.18%  EMT-1           [kernel.kallsyms]            [k] exit_dns_resolver                                                                                                                  
                     |
                     ---exit_dns_resolver
                        |          
                        |--99.71%-- __GI___ioctl
                        |          |          
                        |          |--99.65%-- 0x104492
                        |          |          0x92eb4
                        |          |          0x8fdbf
                        |          |          0xfe7ec
                        |          |          0xfff1c
                        |          |          0x17b35c
                        |          |          start_thread
                        |           --0.35%-- [...]
                         --0.29%-- [...]

    26.52%    26.52%  EMT-2           [kernel.kallsyms]            [k] exit_dns_resolver                                                                                                                  
                     |
                     ---exit_dns_resolver
                        |          
                        |--99.68%-- __GI___ioctl
                        |          |          
                        |          |--99.44%-- 0x104492
                        |          |          0x92eb4
                        |          |          0x8fdbf
                        |          |          0xfe7ec
                        |          |          0xfff1c
                        |          |          0x17b35c
                        |          |          start_thread
                        |          |          
                        |           --0.56%-- SUPR3CallVMMR0Ex
                        |                     |          
                        |                     |--79.82%-- 0xfd6ab
                        |                     |          0xfe583
                        |                     |          0x8fcb5
                        |                     |          0xfe7ec
                        |                     |          0xfff1c
                        |                     |          0x17b35c
                        |                     |          start_thread
                        |                     |          
                        |                      --20.18%-- 0x4a23
                        |                                |          
                        |                                |--99.86%-- 0x4ffb
                        |                                |          0xf1803
                        |                                |          TMR3TimerQueuesDo
                        |                                |          |          
                        |                                |          |--91.19%-- 0xfd5b9
                        |                                |          |          0xfe583
                        |                                |          |          0x8fcb5
                        |                                |          |          0xfe7ec
                        |                                |          |          0xfff1c
                        |                                |          |          0x17b35c
                        |                                |          |          start_thread
                        |                                |          |          
                        |                                |           --8.81%-- 0x8f00f
                        |                                |                     |          
                        |                                |                     |--93.36%-- 0x92f2b
                        |                                |                     |          0x8fdbf
                        |                                |                     |          0xfe7ec
                        |                                |                     |          0xfff1c
                        |                                |                     |          0x17b35c
                        |                                |                     |          start_thread
                        |                                |                     |          
                        |                                |                      --6.64%-- 0x8f9bf
                        |                                |                                0xfe7ec
                        |                                |                                0xfff1c
                        |                                |                                0x17b35c
                        |                                |                                start_thread
                        |                                 --0.14%-- [...]
                         --0.32%-- [...]
#15418 fixed guest addtions: Ubuntu 16.04 Server, error message about libXrandr on Guest Additions start-up -> fixed in releases higher than 5.0.20 FranzS
Description

I get an error message "BoxClient: error while loading shared librarie" in my syslog:

May 14 16:22:41 fortuna vboxadd[837]: Starting the VirtualBox Guest AdditionsInstalling the Window System drivers
May 14 16:22:41 fortuna vboxadd[837]: Could not find the X.Org or XFree86 Window System, skipping.
May 14 16:22:41 fortuna vboxadd[837]: /usr/bin/VBoxClient: error while loading shared libraries: libXrandr.so.2: cannot open shared object file: No such file or directory
May 14 16:22:41 fortuna vboxadd[837]:  ...done.
May 14 16:22:41 fortuna systemd[1]: Started vboxadd.service.

As I took a closer look i found out that this libXrandr is usually only available in systems that have an X Server. But this is not the case in my Machine which is even detected one row above where it say's "Could not find the X.Org or XFree86 Window System, skipping." Therefore i think this is a little bit strange that on the one hand the System detects that there is no X Server and directly afterwards want to use a library that is used for X Servers.

Even during the installation it seems to be properly detected that there is no X Server.

I did the installation like this:

sudo mount /dev/sr0 /media/cdrom/
sudo apt-get install -y dkms build-essential linux-headers-generic linux-headers-$(uname -r)
sudo /media/cdrom/VBoxLinuxAdditions.run --nox11

This was the output, clearly saying that "Could not find the X.Org or XFree86 Window System, skipping."

But still got the Message in the syslog

Verifying archive integrity... All good.
Uncompressing VirtualBox 5.0.20 Guest Additions for Linux............
VirtualBox Guest Additions installer
Copying additional installer modules ...
Installing additional modules ...
Removing existing VirtualBox DKMS kernel modules ...done.
Removing existing VirtualBox non-DKMS kernel modules ...done.
Building the VirtualBox Guest Additions kernel modules ...done.
Doing non-kernel setup of the Guest Additions ...done.
Starting the VirtualBox Guest AdditionsInstalling the Window System drivers
Could not find the X.Org or XFree86 Window System, skipping.
 ...done.
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