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Ticket Resolution Summary Owner Reporter
#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 :-)

#1336 fixed VirtualBox crashes on Solaris host when using Share Folder on WinXP guest => Fixed in 1.6.4 Renaud
Description

I've recompiled VirtualBox from Mar-15-2008 source trunk on Solaris Nevada build 82.

If I add a share folder to my WinXP guest, VB crashes with the following stack (see next comment).

It's 100% reproducible.

I believe this is happening when WinXP tries to reconnect the network drive.

#1337 fixed Protocol error when attempting to connect to VBox VRDP using Microsoft's RDP client for Mac -> Fixed in a future version 1.6.6 Dave King
Description

Running Windows XP guest system via VBoxVRDP on Fedora 7. VRDP is configured for "external" authentication. The Linux rdesktop command connects to the guest, no problems.

When I attempt to connect to the guest system using the "Microsoft Remote Desktop connection Client for Mac Version 2.0.0 Beta 2 (071001)" it fails to connect. A protocol error is logged in the VBox guest's log against a packet that contains the userid and password being sent by the client. (Dummy "userid" and "password" used in the log entry below in place of my real userid/password.)

The Mac client does successfully connect to other remote PCs.

Log extract:

00:07:07.969 VRDP: New connection: 00:07:07.996 VRDP: Channel: [rdpdr] [1004]. Not supported. 00:07:07.996 VRDP: Channel: [rdpsnd] [1005]. Accepted. 00:07:07.996 VRDP: Channel: [cliprdr] [1006]. Accepted. 00:07:08.084 VRDP: Failed to process incoming RDP packet: VERR_VRDP_PROTOCOL_ERROR!!! 00:07:08.085 VRDP: The RDP packet content: 00:07:08.085 00:07:08.085 09a64854 0000: 03 00 01 43 02 f0 80 64-00 01 03 eb 70 81 34 48 ...C...d....p.4H 00:07:08.085 09a64864 0010: 00 00 00 d3 cb 36 74 b7-b4 2a 08 09 04 00 00 bb .....6t..*...... 00:07:08.085 09a64874 0020: 43 03 00 00 00 26 00 10-00 00 00 00 00 00 00 31 C....&.........1 00:07:08.085 09a64884 0030: 00 39 00 32 00 2e 00 31-00 36 00 38 00 2e 00 31 .9.2...1.6.8...1 00:07:08.085 09a64894 0040: 00 2e 00 32 00 30 00 5c-00 75 00 73 00 65 00 72 ...2.0.\.u.s.e.r 00:07:08.085 09a648a4 0050: 00 69 00 64 00 00 00 70-00 61 00 73 00 73 00 77 .i.d...p.a.s.s.w 00:07:08.085 09a648b4 0060: 00 6f 00 72 00 64 00 00-00 00 00 00 00 02 00 1a .o.r.d.......... 00:07:08.085 09a648c4 0070: 00 31 00 39 00 32 00 2e-00 31 00 36 00 38 00 2e .1.9.2...1.6.8.. 00:07:08.085 09a648d4 0080: 00 31 00 2e 00 32 00 32-00 00 00 00 00 00 00 00 .1...2.2........ 00:07:08.085 09a648e4 0090: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 00:07:08.085 09a648f4 00a0: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 00:07:08.085 09a64904 00b0: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 00:07:08.085 09a64914 00c0: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 00:07:08.085 09a64924 00d0: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 00:07:08.085 09a64934 00e0: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 00:07:08.085 09a64944 00f0: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 00:07:08.085 09a64954 0100: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 00:07:08.085 09a64964 0110: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 00:07:08.085 09a64974 0120: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................ 00:07:08.085 09a64984 0130: 00 00 00 00 00 00 00 00-00 a0 2b 00 00 07 00 00 ..........+..... 00:07:08.085 09a64994 0140: 00 00 00 ... 00:07:08.085 00:07:08.085 VRDP: Connection closed: 00:07:08.085 VRDP: Logoff: dlk-mac (192.168.1.22) build 0. User: [192.168.1.20\userid] Domain: [] Reason 0xFFFFFFFF.

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