Hello! I''m wondering about installing windows server on xen-hvm, I have VT enabled cpu''s. Do I need install GPLPW drivers to get better performance? Or the cpu''s will do that work? As stands here: http://www.virtuatopia.com/index.php/An_Overview_of_Virtualization_Techniques#Hardware_Virtualization then VT enabled cpu''s will enshure. that unmodified guest virtual machines will run without the overheads. Is this true? _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hello, The GPLPV drivers provide paravirtualized drivers for networking, disk and others that improve that performance in HVM domains. The regular HVM domains use the default qemu-dm for devices. The CPU''s VT instructions don''t handle device drivers :) I wish I could tell you more, but the without the VT enabled CPUs you wouldn''t be able to run a Windows domU. Best, Tait -----Original Message----- From: xen-users-bounces@lists.xensource.com [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Ma-ris Ruskulis Sent: Wednesday, January 28, 2009 9:20 AM To: xen-users@lists.xensource.com Subject: [Xen-users] HVM and Intel VT processors Hello! I''m wondering about installing windows server on xen-hvm, I have VT enabled cpu''s. Do I need install GPLPW drivers to get better performance? Or the cpu''s will do that work? As stands here: http://www.virtuatopia.com/index.php/An_Overview_of_Virtualization_Techniques#Hardware_Virtualization then VT enabled cpu''s will enshure. that unmodified guest virtual machines will run without the overheads. Is this true? _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Wed, Jan 28, 2009 at 9:20 AM, Ma-ris Ruskulis <maris@chown.lv> wrote:> Hello! > I''m wondering about installing windows server on xen-hvm, I have VT > enabled cpu''s. Do I need install GPLPW drivers to get better > performance? Or the cpu''s will do that work? As stands here: > http://www.virtuatopia.com/index.php/An_Overview_of_Virtualization_Techniques#Hardware_Virtualization > then VT enabled cpu''s will enshure. that unmodified guest virtual > machines will run without the overheads. Is this true?it''s a common misconception that VT features give some kind of performance benefits; but it''s totally wrong. VT features just make it possible to virtualize almost the whole CPU without resorting to software emulation. that''s what HVM guests are. but the rest of the hardware (especially storage, network, and display devices) is still emulated in software. VT doesn''t do a thing there. PV drivers bring the performance benefits of paravirtualization to the parts of a closed OS (windows) that can be replaced: device drivers. in short: fully PV guests can only run modifiable (open source, mostly) OSs. for non-modifiable (windows) OSs you need VT, but periferals are emulated, thus slow. PV drivers fix that. -- Javier _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users