VirtualBox

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Ticket Resolution Summary Owner Reporter
#546 duplicate Mac OS X Host: Request Supplemental DNS Resolution Support sipples
Description

Mac OS X resolves host names differently than many other operating systems. The DNS resolver is described here:

http://developer.apple.com/documentation/Darwin/Reference/ManPages/man5/resolver.5.html

See especially the section "SEARCH STRATEGY."

Many Mac OS X VPN clients take advantage of this resolver behavior, inserting supplemental DNS servers ahead of the entries in /etc/resolv.conf for specific domains, as described in Apple's reference. However, at present VirtualBox does not provide the ability to guest OSes to resolve these addresses to the correct DNS servers.

Although this is an enhancement request, it is also at least borderline "defect" given the way Mac OS X hosts resolve addresses. One solution appears to be to implement a lightweight DNS forwarder as part of VirtualBox, such as dnsmasq. MaraDNS might also provide a useful codebase.

#2172 worksforme VM Hangs (high CPU) after performing huge I/O in the guest Gurjeet Singh
Description

Host: Windows Vista Business (with all the updates applied) Guest: Ubuntu Server 8.04, on 64MB RAM, Host networking over wireless, using DHCP. Running in Headless mode using VBoxHeadless.exe H/W: Lenovo Thinkpad R61i, with 2GB RAM, Intel Centrino Duo. S/W on Guest: .) Corrected Console framebuffer with 'vga=771' (or something similar) on the kernel line. .) Using apt-get, installed 'cvs make gcc libc-devel readline-dev flex bison'. .) Downloaded (using CVS), compiled (with no custom flags to ./configure), installed and running PostgreSQL DB version 8.3.3. .) Running 6 instances of a bash script that scrapes web and inserts data into Postgres database.

Initial diagnosis done using ProcessExplorer, some screenshots attached showing the call-stack of the thread consuming most of the CPU because it is performing so many Context-Switches (sometimes as high as 31600 per second)!

I performed a SELECT on a Postgres 8.3.3 database table that was about 50MB in size, and saw that the for about three minutes the VM performed huge I/O; 11-13 MB/s of read and 1-4 MB/s write. After this, the I/O storm stopped just as immediately as it started, but now the VM started consuming huge CPU!

The VM has been running for over half an hour now, consuming 100% of CPU on one of my 2 CPUs. I have paused and restarted the VM from GUI twice in the hopes of resetting some state and bringing the VM to normalcy, but to no avail!!!

I'll keep this VM running for next few hours or so, so that I can provide some useful info, if somebody asks.

#11301 obsolete Linux VirtualBox machines suffer bugs and compatibility problems on Windows 8 Host sinansas
Description

I installed 64 bit Fedora, Ubuntu and Linux Mint as VirtualBox machines on Windows 8 (Pro x64) host. And there are a few problems I noticed, namely; they all crashed a few times, and the mouse pointer is flashing when mouse integration is enabled, and the virtual machine screen does not auto-resize even though the guest additions are installed, and the machines are awfully slow even though I allocate a good deal of hardware resources, and the virtual machine window doesn't disappear when the system is halted. In brief, they all are not usable.

Please note, I was using various Linux distros seamlessly as VirtualBox machines on Windows 7.

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