Ticket #6110 (new defect)
Guest OS with more than 3GB RAM locks up if more than 3GB written out to guest HDD
|Reported by:||mikep-fl||Owned by:|
- Host machine: AMD Phenom 9650 Quad-Core Processor /w 8GB RAM
- Host OS: Debian Lenny
- Guest OS: Guest OS: Debian Lenny, 1CPU, 3.5GB RAM, 10GB HDD, IDE controller
- running in 32-bit for host and guest
I have found if I have more than 3GB of RAM allocated to the Guest OS and execute a program which writes out more than 2.8GB of data to the guest hard drive, the guest machine locks up. Found first when trying bonnie++ for I/O benchmark testing. Able to repeat using dd if=/dev/zero of=testfile bs=1048576 count=3000.
What I see happening is as the large datafile is being written out on the guest machine, on the host, top reports the RES value for VBoxHeadless increases until it reaches 3.0g. Once RES reaches this value, the guest machine stops responding.
Nothing is written out to the vbox.log file. Attached is a screen shot with top running on the host (green text) and top running on the guest (white text) after the guest stops responding.