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Ticket Resolution Summary Owner Reporter
#3601 obsolete PXE Boot gives up Anders Olsson
Description

When booting a VM through PXE, the current behavior is to try Interface 1 for some time, then go over to the next interface, and when there are now more interfaces, give up. A better behavior would be to go round-robin, so that when there are no more interfaces, in would start over from interface 1. In the case of the server facilitating the PXE boot also being a VM, it might not be booted before the other VM's PXE boot has given up.

It would also be useful to select which interface(s) should boot, so that one doesn't have to wait for an interface which is on a different net to time out.

#3609 obsolete Virtual Box crashes when restoring saved session -- PAE-related? Jeff Levy
Description

When I try to restore a saved state, the program closes. I have two VMs, and this only happens for one of them. However, I deleted this VM and made a new one with the same hard drive, and it still happens. The host is windows XP Pro SP3. The guest OS is Ubuntu 8.10 server. My other VM which saves just fine is Ubuntu 8.04 desktop. Could this problem be because the guest is a server OS, and I had to enable PAE?

#3613 obsolete High CPU usage with idling guest induced by RTC interrupts Nerijus
Description

Bug possibly related to: #1884

Occurs on both Vbox 2.1.4 and 2.2.0 Beta2

With Windows 7 guest, and possibly Windows Vista, Windows XP SP3, Windows Server 2008, Windows Server 2008 R2 guests.

When running:

  • MS SQL server 2008 (express or not),
  • SQL server 2005 SP3
  • TwinCat
  • Google Chrome
  • Or possibly another application which uses 70h interrupts for timing

virtual box uses ~60-70% of single CPU, while guest OS is almost idle.

What was expected to happen: Host should be almost idle too.

Upon further investigation, it appears that these programs use "Real-Time Clock Interrupt", which fires 1024 times per second.

Source: http://blogs.msdn.com/psssql/archive/2008/12/16/how-it-works-sql-server-no-longer-uses-rdtsc-for-timings-in-sql-2008-and-sql-2005-service-pack-3-sp3.aspx

Problem with SQL server 2008: Forum thread: http://forums.virtualbox.org/viewtopic.php?f=2&t=15668

Same thing happens with Google Chrome. Bug ticket: http://www.virtualbox.org/ticket/1884

TwinCat Forum thread: http://forums.virtualbox.org/viewtopic.php?f=2&t=12941

How problem can be observed with Windows 7 guest (and possibly other guests):

  1. Open "perfmon", and add "Processor->Interupts/sec" counter to monitor.
  2. Start Google Chrome (or another mentioned application), and wait for it to finish initialization.
  3. Watch interrupt count to increase by 1024 per second. This is expected. Guest remains idle.
  4. However, on host, CPU usage increase significantly.
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