VirtualBox

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Ticket Resolution Summary Owner Reporter
#2911 duplicate bad reads on SATA disks schnittchen
Description

I had massive filesystem corruption for no apparent reason, so I investigated a bit. Apparently, reads on (guest, virtual) SATA disks can produce wrong data.

My setups were linux (Ubuntu 8.04 and 8.10) guest and host (all combinations). In order to locate the problem, I attached a vmdk disk image with prepared data so that I could tell from the read data at which blocks something had gone wrong. The image came in two variations:

  • an "entire disk access" vmdk pointing to an entire mapper device
  • a modified version pointing to a file, created by editing the vmdk by hand.

The problem appeared in both situations.

This is a "heisenbug", I have read many megabytes of intact data and could not reproduce the symptom until it finally hit again. It seems to appear more often when a large number of blocks is read (I did the read using dd inside the guest, so I played with the block size parameter). It seems to be very well reproducable within 150 MBytes (my prepared disk was 25MB).

There is no such problem with IDE. After detaching the vmdk and reattaching on an IDE slot it disappeared, and reappeared when on SATA again.

I captured all badly read blocks in order to get a feeling for it. I looked at the first few kilobytes and found not a single sector from the prepared disk image! The data seems to come somewhere out of RAM, or from the other attached (IDE) disk of the guest. I have seen symbols, format strings and even directory nodes.

uname of one of the host systems: Linux myhost 2.6.24-23-generic #1 SMP Thu Nov 27 18:44:42 UTC 2008 i686 GNU/Linux

The guest is almost the same. vbox version is 2.1.0

I hope this is enough information to reproduce and locate the problem.

#14617 fixed bad performance when playing youtube on VM theben.nl
Description

Hi to all, Since a few weeks I have a brand new computer with 8gb RAM so I installed Virtual box. Created a few VM,s and all was playing well. Last week I upgraded the host to Windows 10, since than, the VM's in Virtualbox react poor and when playing youtube or movies, it seems if the data is coming through an old modem line or so. Has anyone experience with this problem? Add ons and so are all installed und drivers are all ok. Look forward to your tips.

#2438 fixed bad NAT performance (outgoing/uploading/writing speed drops to 0kb/s) zyro
Description


The first Problem i encountered was MS Office terribly slow opening Documents stored on my Host shared folder. This issue was fixed by the MRXMP.dll (see above).

But now my issue is a extremely slow outgoing connection with the NAT'ed network interface.

  • Connection speed while uploading or transfer files from the guest to the network drops to 0 kb/s for about 1-2 seconds every 5-10 seconds.
  • This goes so far, that my network printer seems to have to take breaks because it does not get enough data to print continously


As far as i can tell, this problem must have sth. to do with NAT and the outgoing direction:

  • Downloads work at satisfying speed
  • Tried HostNetworkInterface (Bridged): No more lags/drops to 0kb/s
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