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This is a clean installation of Solaris 11 X86 in the latest Virtualbox, running on Windows 7 host.

I am downloading some files in the Solaris virtual machine, and all suddenly, this happens:

enter image description here

I cannot understand why it happens. Please offer your opinions, thank you!

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The first possibility that comes to mind is whatever mechanism that Firefox is using to download the files is the culprit. I have found that Firefox is a hog when downloading files. It behaves as though it is running a scripted language, with all of the overhead that implies. –  Yedric Sep 26 '12 at 19:35
Later, I have been able to reproduce the problem using Linux and VirtualBox/VMware hypervisors by transferring large amount of data through loopback interface. I guess it is either Windows/NIC driver/Vmware/Virtualbox's fault... –  Howard Sep 26 '12 at 21:05

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