<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV>Thanks for the clarification.</DIV>
<DIV> </DIV>
<DIV>I've attached the log file when the vm crashed on Windows host with VT-x enabled.</DIV>
<DIV> </DIV>
<DIV>The vm works fine without VT-x.</DIV>
<DIV> </DIV>
<DIV>The guest is p2v vm from Intel-Mac containing 2 partitions: Windows 7 and Ubuntu 9.04.</DIV>
<DIV> </DIV>
<DIV>Interestingly, the Linux partition works fine even when VT-x is enabled, only windows 7 fails<BR><BR>--- On <B>Mon, 9/28/09, Frank Mehnert <I><Frank.Mehnert@Sun.COM></I></B> wrote:<BR></DIV>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid"><BR>From: Frank Mehnert <Frank.Mehnert@Sun.COM><BR>Subject: Re: [vbox-dev] VT-x not very stable?<BR>To: vbox-dev@virtualbox.org<BR>Date: Monday, September 28, 2009, 8:28 AM<BR><BR>
<DIV class=plainMail>On Friday 25 September 2009, Huihong Luo wrote:<BR>> Quite sometimes, especially for those large p2v VMs, I had to turn off VT-x<BR>> in order to be able to launch the vm. It works well without VT-x, but<BR>> terminated unexpectedly if VT-x is on. All other configs are same. <BR>> Does VT-x improve performance significantly? What do I lose when VT-x is<BR>> off? (except those known features, such as multiple CPUs, 64-bit, etc) <BR>> Thanks,<BR><BR>VT-x/AMD-V is the preferred way of virtualization. The VM is probably<BR>not faster than in software virtualization but the virtualization is<BR>''more correct''. The software virtualizaion mode makes many assumptions<BR>about the guest and the guest code is changed during execution to make<BR>it executable on the VM. Such code modifications are visible to the guest<BR>and pity guests aren't happy about this ...<BR><BR>Kind regards,<BR><BR>Frank<BR>--
<BR>Dr.-Ing. Frank Mehnert Sun Microsystems, Inc. www.sun.com<BR></DIV><BR>-----Inline Attachment Follows-----<BR><BR>
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