Does anyone use acpi=0 under windows? Is there a legitimate reason why you might need to? I''m trying to sort out some problems with the gplpv drivers and one of the solutions would require acpi=1 to get access to more interrupts (irq# > 15) James _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
James Harper
2008-Jul-22 10:42 UTC
RE: [Xen-users]make that anyone using apic=0 under windows?
Sorry, I meant apic not acpi.> -----Original Message----- > From: xen-users-bounces@lists.xensource.com [mailto:xen-users- > bounces@lists.xensource.com] On Behalf Of James Harper > Sent: Tuesday, 22 July 2008 20:38 > To: xen-users@lists.xensource.com > Subject: [Xen-users] anyone using acpi=0 under windows? > > Does anyone use acpi=0 under windows? Is there a legitimate reason why > you might need to? > > I''m trying to sort out some problems with the gplpv drivers and one of > the solutions would require acpi=1 to get access to more interrupts > (irq# > 15) > > James > > _______________________________________________ > 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
Klaus Steinberger
2008-Jul-22 11:06 UTC
[Xen-users] Re: anyone using acpi=0 under windows?
Hi James,> Does anyone use acpi=0 under windows? Is there a legitimate reason why > you might need to?In older XEN Versions it was probably necessary to get windows running. Nowadays I always use "acpi=1"> I''m trying to sort out some problems with the gplpv drivers and one of > the solutions would require acpi=1 to get access to more interrupts > (irq# > 15)Sounds good. Btw. do you have any idea why the drivers works badly with SMP HAL? Sincerly, Klaus -- Klaus Steinberger Beschleunigerlaboratorium Phone: (+49 89)289 14287 Am Coulombwall 6, D-85748 Garching, Germany FAX: (+49 89)289 14280 EMail: Klaus.Steinberger@Physik.Uni-Muenchen.DE URL: http://www.physik.uni-muenchen.de/~Klaus.Steinberger/ _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Disabling ACPI in the HVM configs was the only way to get Windows to run decent (read as you know it to) without drivers on older versions of Xen. If ACPI was left enabled on Windows HVMs on those versions of Xen, a lot of processor time would be wasted on something. This has been fixed in newer versions of Xen (I had a thread in the fedora-xen list regarding this issue, and it turns out alder versions of KVM had the same issue and newer versions don''t). I always leave ACPI enabled so that Windows will signal the VM to power off (shutdown/destroy itself) after shutting down. People could have ACPI disabled because they learned to create the machines that way or because they migrated from older versions of xen, so the real question is, do you care and/or does it matter? In the does it matter field, if the drivers will still function fine when these interrupts don''t exist, then you could just make note of this. In the do you care field, theoretically, these potential users could install the ACPI kernel on their existing systems after changing it to enabled (I say theoretically because they have to know how and changing kernels doesn''t always work smoothly), and the only legitimate reason I know of would be for performance on older versions of Xen. I could be remembering wrong, or there could be other legitimate reasons, but hopefully someone else will speak up in the case of either of those situations. An afterthought: I believe instructions for installing Windows on older versions of xen may have suggested pressing a key (F5 or F7) during the first portion of Windows setup (while being prompted to press F2 or F5) in order to disable ACPI in Windows while leaving it enabled on the HVM, in this case, the only step a user would have to take is switching kernels. Another afterthought, the libvirt-created xml domains where virt-install is used and Windows is selected may disable ACPI, possibly just for the first boot, possibly permanently, I don''t know, that would make a lot of people fall into the ACPI disabled category that don''t necessarily know it and/or don''t necessarily know how to fix it. Dustin -----Original Message----- From: xen-users-bounces@lists.xensource.com [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of James Harper Sent: Tuesday, July 22, 2008 06:38 To: xen-users@lists.xensource.com Subject: [Xen-users] anyone using acpi=0 under windows? Does anyone use acpi=0 under windows? Is there a legitimate reason why you might need to? I''m trying to sort out some problems with the gplpv drivers and one of the solutions would require acpi=1 to get access to more interrupts (irq# > 15) James _______________________________________________ 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
Dustin Henning
2008-Jul-23 14:29 UTC
RE: [Xen-users]make that anyone using apic=0 under windows?
Sorry, I looked for responses before sending my previous e-mail, and I didn''t see this one. I don''t know of any situation where it would be necessary to change apic from its default state for a Windows DomU in Xen, but that doesn''t mean there aren''t any. Dustin -----Original Message----- From: xen-users-bounces@lists.xensource.com [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of James Harper Sent: Tuesday, July 22, 2008 06:43 To: James Harper; xen-users@lists.xensource.com Subject: RE: [Xen-users]make that anyone using apic=0 under windows? Sorry, I meant apic not acpi.> -----Original Message----- > From: xen-users-bounces@lists.xensource.com [mailto:xen-users- > bounces@lists.xensource.com] On Behalf Of James Harper > Sent: Tuesday, 22 July 2008 20:38 > To: xen-users@lists.xensource.com > Subject: [Xen-users] anyone using acpi=0 under windows? > > Does anyone use acpi=0 under windows? Is there a legitimate reason why > you might need to? > > I''m trying to sort out some problems with the gplpv drivers and one of > the solutions would require acpi=1 to get access to more interrupts > (irq# > 15) > > James > > _______________________________________________ > 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 _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users