VirtualBox

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Ticket Resolution Summary Owner Reporter
#1333 fixed Share file invisible -> Fixed in 1.6 Vivien
Description

I installed a Win XP Pro guest on Mac OS X host. I shared a folder via VirtualBox after installing the additional guests addons. When I connect on my guest, I can't see any share folder. When I look the network places, there's nothing. I tried also to create a link with this command line : net x: \vboxsrv\shared but the vboxsrv was not found... So I don't know how to find my share folder...

#1334 fixed Network connection blinking when not connected Danny
Description

Host: Windows Vista Home Premium
Host Network: VirtualBox Hostinterface and host's LAN connections are bridged
Guest: Windows XP Home Edition SP2, clean install
Guest Network: configured as host interface, using the PCnet FAST III adapter
VBox 1.5.6, Guest Additions 1.5.6 installed

When I disconnect the guest's network cable, the network connection is "blinking" (i.e. connected - not connected - connected...). It doesn't matter if I start disconnected or if I disconnect the cable while the vm is running.

The session log is attached (cable disconnected all the time).

#1335 duplicate Very low speed on outgoing traffic with NAT jakobsg
Description

Description The NAT mode guest interface is truely a great feature, but there are some optimization/scheduling problems on outbound traffic to remote hosts. I have tried this on several hosts (linux and windows) each with different hardware configurations, the result is the same - a throughput less than 500 kbyte/s (on windows hosts less than less than 100 kbyte/s). There is no problem when sending data from the guest to it's host. I have spent days debugging and profiling, but the problem is not a part of my expertees so at last I had to give up.

I have communicated quite a lot with the vbox developers via IRC passing on debug and profiling information - they say the problem is due to low prioritized scheduling on the host side.

Reproduce

  1. Install a guest
  2. Set up NAT on NIC1
  3. Boot up on the guest and send something rather large to a remote host (for instance using scp on a linux guest).

Odd observations

  1. Outbound traffic to the host is runs fast (8-10 Mbyte/s on my system)
  2. Traffic to remote host on LAN very slow (less than 100 kbyte/s)
  3. When I profile VBoxDD.dll outbound traffic speed jumps to 30X speed (more than 3 mbyte/s) (only on LAN)
  4. While attempting to do some manual profiling in pcnetAsyncSendThread() (src/VBox/Devices/Network/DevPCNet.cpp) I opened a file for output and closed it again each time. This appearenty up prioritized the thread for transmitting network packets and the speed suddenly went drastically up.

My opinion I think there is a great potential in NAT with port forwarding, because it enables you (in conjunction with VBoxHeadless.exe) to distrubute a virtual machine and run it as a normal service (ie. Windows Service) the only thing missing is outgoing traffic speed :-)

Best regards Jakob Simon-Gaarde

btw: vmware's NAT has the same defect. So this could be a place where VirtualBox can offer a little more :-)

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