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Ticket Resolution Summary Owner Reporter
#2048 fixed Linux - Disk I/O performance problems Christian Holler
Description

Hello,

I am running VirtualBox 1.6.4 on a Linux system with a Linux guest. I did I/O performance tests with the following setup:

  1. I created a 4 GB file on the root filesystem of the guest (called test.file) with dd from /dev/zero
  1. I ran "dd if=/dev/zero of=/test.file bs=4M count=1000 conv=notrunc"
  2. I ran "dd if=/dev/zero of=/test.file bs=4M count=1000 conv=notrunc oflag=direct"

So both commands overwrite the existing file without truncating it, the second command uses direct I/O for this task.

The results are as follows:

dd if=/dev/zero of=/test.file bs=4M count=1000 conv=notrunc &

1000+0 records in
1000+0 records out
4194304000 bytes (4.2 GB) copied, 416.406 s, 10.1 MB/s

dd if=/dev/zero of=/test.file bs=4M count=1000 conv=notrunc oflag=direct &

1000+0 records in
1000+0 records out
4194304000 bytes (4.2 GB) copied, 108.356 s, 38.7 MB/s

As one can see, the first command (normal I/O) is very slow, whereas direct I/O is resonably fast. Is there any explanation for this behavior? As far as I know, direct I/O circumvents buffering in the linux kernel, so there must be a performance bottleneck somewhere making normal I/O really slow.

The underlying filesystems are all ext3, and the selected disk controller is SATA if that is important :)

Best regards,

Chris

#2049 obsolete VBoxHeadless with "-a" option aborts when restoring state Steve Dodd
Description

I'm running VB 1.6.6 on Ubuntu (this bug happens on both Gutsy and Hardy.)

If I use the -a option to VBoxHeadless to restore a VM with saved state, I get the following error message (and the VM is set to 'aborted' state):

VirtualBox Headless Interface 1.6.6
(C) 2008 Sun Microsystems, Inc.
All rights reserved

[!] FAILED calling vrdpServer->SetNetAddress(Bstr(vrdpAddress)) at line 855!
[!] Primary RC  = E_ACCESSDENIED (0x80070005) - Access denied
[!] Full error info present: true , basic error info present: true 
[!] Result Code = E_ACCESSDENIED (0x80070005) - Access denied
[!] Text        = The machine is not mutable (state is 2)
[!] Component   = Machine, Interface: IMachine, {f95c0793-7737-49a1-85d9-6da81097173b}
[!] Callee      = IVRDPServer, {ed9d31ae-867f-45fc-b727-6740084d1883}

The command I'm running is

VBoxHeadless -s <VMName> -a 127.0.0.1

It doesn't seem to happen when starting a VM from powered off state. In case it is relevant, I'm saving the VM states with "VBoxManage controlvm VMName savestate".

#2050 worksforme VBoxSDL restores state slowly on Ubuntu Hardy (but not Gutsy) Steve Dodd
Description

On my machines, restoring the saved state of a VM with ~512Mb RAM generally takes about 8 secs or so, regardless of frontend.

The only exception is VBoxSDL running on Ubuntu Hardy, which seems to take ~22 secs or so. The same version (1.6.6) running on Gutsy does not exhibit this problem. Hardly a major issue, but I'm working on an appliance / kiosk use for VBox, and it would be nice to have start up as fast as possible :)

Incidentally, I tried downgrading the libsdl1.2debian* packages on Hardy back to the Gutsy versions, in case that was the issue, but it didn't help.

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